My weekend at ESBOC

My three days at the European Symposium on Biological and Organic Chemistry (ESBOC) did not start in the most auspicious way. Or, again, maybe they did. Well, Friday the 17th, the day of my departure, is a day of bad luck in Italy, much like Friday 13th is in many other countries (it may not sound like it given my name, but I am indeed Italian), and my stopover at Birmingham New Street station to catch my connection to Newtown (Powys), Wales, certainly got my heart pumping.

To make a long story short, my apparently comfortable fifteen-minute leeway between my arrival from London Euston and my departure to (seemingly unknown in Birmingham) Newtown got eaten away by a mostly fruitless search for ‘my’ platform in a station, which, I later found out, is undergoing significant redevelopment — and is not very passenger-friendly. After a few minutes’ queue to reach the information desk, I got sent by the guy behind it to “platform 5b”, when I probably had something like seven minutes left to spare. After about five minutes of frantic soul-searching while pacing on a platform that just didn’t seem right, and that was at once platform 5, platform 5a and platform 5b, I grabbed my trusty trolley by the neck, ran up the stairs to the main concourse, then to the closest display panel, and finally down the stairs to platform 6b, as a train moved slowly past it. Was it my train? Was it pulling in? Was it pulling out? Well, suffice to say that, much to my relief, I made it to Newtown on time to catch the minibus meant to take all ESBOC participants arriving by train to the conference venue at Gregynog, a relatively isolated location about 8 km of narrow, windy road away from the town.

View of Gregynog. Courtesy of Dr. James Redman.

View of Gregynog. Courtesy of Dr. James Redman.

Gregynog… It is actually a beautiful country house surrounded by 750 acres of (beautiful, it behooves to stress) gardens and woods sitting right in the middle of Wales. It was donated to the University of Wales in 1960 by its owner, the late Miss Margaret Davies, as an arts center. As I started looking for my room, a friendly and slightly surprised member of staff exclaimed, “Room G2? It’s one of our two best rooms sir!” Wow, time to let my hair down, if I hadn’t just had it cut rather short, that is. The room was actually very nice and comfy, and I had something like half an hour to unpack before the conference reception and presentation.

This year’s annual conference was the 47th of the series, as this symposium was first organized here at Gregynog in 1967 by Professor Cedric Hassall of University College, Swansea. At the time, it was called Gregynog Natural Products Symposium, a name changed to European Symposium In Bio-Organic Chemistry in 1971, to become the present-day European Symposium on Biological and Organic Chemistry only in 2011. This year’s chair, Professor Kai Johnsson of EPFL Lausanne, Switzerland, could actually not be present, as his wife is expecting a baby imminently, so the role of hosts was entrusted to the capable hands of the Chairman of the Steering Committee, Professor Tim Bugg of the University of Warwick, and of the Treasurer and Secretary, Dr. James Redman of Cardiff University.

 

Cover of the program of the 1967 Gregynog Natural Products Symposium.Courtesy of Dr. James Redman.

Cover of the program of the 1967 Gregynog Natural Products Symposium.Courtesy of Dr. James Redman.

The title of this year’s symposium was “Chemical Probes for Cellular Processes”, a subject that elicited an excellent response of corporate and non-corporate sponsors and, according to Professor Bugg, the most international attendance of the symposium to date. This year’s ESBOC had 60 participants from eight different countries affiliated to both academic institutions and industry. The program included 18 lectures by invited speakers, ten of them plenary and two ‘named’, and it also included a 12-strong poster session. Among the scheduled speakers were Nature Protocols’s own authors Ben Cravatt of the Scripps Research Institute, Edward Tate of Imperial College London, and Carsten Schultz of EMBL Heidelberg. All the talks, which included lectures by ‘industry’ speakers Dr. Ivan Correa of New England Biolabs and Dr. Keith Wood of Promega, were up my alley, so to speak, as they were generally given by chemists who applied their skills to attempt to answer biological questions, exactly my research background.

Participants of the 1969 Gregynog Natural Products Symposium. Cedric Hassall is the second person on the left seated. Courtesy of Professor Timothy Bugg.

Participants of the 1969 Gregynog Natural Products Symposium. Cedric Hassall is the second person on the left seated. Courtesy of Professor Timothy Bugg.

It wasn’t just that I understood the talks in their entirety, which is undoubtedly a big plus, but I actually really enjoyed them. The symposium was small enough that no talks needed to be scheduled at the same time, so I was able to attend all of them. The lectures spanned subjects like applying bioluminescence to the study of intracellular interactions or the imaging of fatty acids, activity-based protein profiling, phage selection of peptides with different bio-relevant properties, the synthesis of riboswitches to control gene expression, the expansion of the SNAP-tag tool box, and fluorescence-based approaches to investigate nucleic acid structure. Talking about activity-based protein profiling, unfortunately Professor Ben Cravatt, who was supposed to give the first day’s Royal Society of Chemistry Bio-Organic Group Lecture entitled “Activity-based proteomics: applications for enzyme and inhibitor discovery”, could not be present, due to a family commitment, but he was replaced by post-doc Ken Hsu from his lab, who, despite the short notice and an 8-hour jetlag — Scripps is in San Diego, California — gave a wonderful talk on the use of activity-based protein profiling on serine hydrolases for the discovery of bioactive lipid networks by chemoproteomics and metabolomics.

The next day’s ‘marquee’ talk, the Cedric Hassall Lecture (“In vivo selective optical imaging of tiny tumors to rationally designed activatable fuorescence probes”), was to be given instead by Professor Yasutero Urano, of the University of Tokyo. Except that Yasutero was not the speaker’s first name. As he initiated his talk, Professor Urano pointed out that his name is actually YasuterU, and went on to speculate that the tendency of his European colleagues to spell it with an “O” must be due to an understandable mental association between himself and Elvis CostellO. Well, to be honest, I did not see much of a physical resemblance between Professor Urano and Elvis Costello, not least because the former is obviously much younger. The association was made clearer, however, by the thunderous applause that greeted the end of Urano’s lecture. A really impressive talk, even for an outsider like myself.

Professor Urano had described his laboratory’s work on synthesizing and testing probes that become fluorescent only when taken up by tumor cells, a strategy that would prospectively enhance surgeons’ ability to literally see cancerous tissues when operating. Urano’s research group had used two main approaches to achieve their goal. In one, pH-sensitive fluorescent probes are fused to an antibody specific to membrane receptors that are highly expressed on the surface of tumor cells. Upon endocytosis, the low-pH environment of the cell lysosome causes activation of the probe, which thus becomes fluorescent. In the second, the probe is fluorescently inactive as long as it remains bound to an appended peptide group, which can however be cleaved by GGT, a peptidase highly expressed on the surface of tumor cells. Upon cleavage of the peptide bond, the newly fluorescent and highly hydrophobic probe concentrates first on the cell membrane, and, eventually, inside the cell, to highlight that cell’s unhealthy state. What did I say? Really impressive.

As ESBOC drew towards its end, I even found out how Gregynog is pronounced correctly. Two competing schools of thought seemed to take shape on the matter at the conference. According to participants with Welsh connections, the pronunciation in southern Wales would be something like Greg-EYE-nog, whereas people in northern Wales may actually pronounce it Greg-E-nog. Unfortunately Gregynog is almost in the dead center of Wales… Mystery solved on Saturday night, however, when we ESBOC participants were entertained by the charming music of Welsh harp player and folk singer Siân James, clearly a reliable source on all things Welsh. To my untrained ear, she pronounced the locale “Greg-e-nog”, making a slight clicking sound with her tongue when she uttered the second and third g’s of the word.

What can I say? My experience at ESBOC was excellent all around. The place was fantastic, the talks outstanding, the participants friendly and chatty, and my ‘contacts’, Professor Bugg and Dr. Redman, always helpful. Even the food was terrific. Word on the street was that Gregynog had recently hired a new German chef, and everyone was raving about him. Ok, I am Italian, but I have to admit that he really knew his stuff. On Sunday the weather too smiled on us, with a gloriously sunny day; too bad that we were about to leave and that strolling around the grounds had been scheduled for the day before. Oh well, not bad for a conference two train and one minibus ride away that started on a Friday the seventeenth…

Well, the last bit of important information concerns next year’s ESBOC at Gregynog: ESBOC 2014 will take place on 16–18 May, and it will be organized by next year’s scientific chair, Dr. José Luis Mascareñas of the Universidade de Santiago de Compostela, in Spain. The title of that conference will be “Biological Applications of Supramolecular Chemistry”. Make time to go, if you can.

 

 

 

An Extra Dimension to Protocols

At Nature Protocols we have long held the, not particularly radical view, that seeing an experiment performed can be a whole lot more informative. We have always encouraged authors to provide videos of their experimental procedures and have used our Featured Videos page and more recently our YouTube channel to make them easier for readers to access. A little over a year ago we realised that by combining the commenting feature present on all our Protocols with YouTube’s player we could kluge together a way to tack videos onto the end of their HTML versions.

But now I’m very happy to say that these less than perfect solutions to showing how experiments are performed have been superseded. We can now display the videos right in the text of Protocols.

If you take a look at the recent Protocol by Lalita Ramakrishnan on “Evaluation of the pathogenesis and treatment of Mycobacterium marinum infection in zebrafish” (doi:10.1038/nprot.2013.068) you will see that the citations in the text to supplementary videos are also links. These links produce a pop-out video player on the page to watch the video. Or alternatively the videos can be viewed at larger size in the figure index.

A screenshot of the new way to view videos in Nature Protocols

A screenshot of the new way to view videos in Nature Protocols

 

This may seem like a small change but we hope that this way of handling videos will make them more useful to readers and we hope will encourage authors to think creatively about the use of videos in their protocols. We will certainly be encouraging authors to take advantage of the possibilities this facilitates.

What other changes to our presentation would you like to see? All supplementary figures and tables shown as pop-outs just like videos? Seamless access to the raw data behind figures? Procedures that you can annotate yourselves? Stopwatches attached to the timing sections? Just tell us and we will see what we can do.

At MASAMB XXIII

So I’m back… Well, I have actually been back for a little while already, as this year’s Mathematical and Statistical Aspects in Molecular Biology (MASAMB) meeting was held last April 11th and 12th.

Mission accomplished, it is fair to say. The idea was for me to acquaint myself face-to-face with research areas — bioinformatics and statistical genetics — which Nature Protocols has always covered, and in which it hopes to be even more active in the near future. For sure, over a day and a half I had the opportunity to attend a total of 25 presentations divided into five sessions: statistical bioinformatics, computational cell biology, next-generation sequencing, systems biology, and evolution. I will not claim to have understood everything I heard, but all presentations were stimulating and thought-provoking. Given my background in ‘wet’ chemistry and biochemistry, I guess it was no surprise that I found it easier to follow the biological side of the talks than the parts that dealt with mathematical and computational models, but I am now much more familiar with the landscape in this research area.

My attendance of MASAMB, as I discovered on site, was primarily made possible by the engaging and amiable host of this year’s MASAMB, Dr. Michael Stumpf of Imperial College, via the intercession of my email contact, Dr. Louise English. During one of the poster sessions, Michael explained to me that one of the main goals of MASAMB is to provide PhD students and post-docs with a workshop-like venue in which to present their own research in an environment that is more ‘intimate’ and less intimidating than the average meeting. Students and post-docs are those most encouraged to present their work, Michael added, and most of the conference speakers belong to this category.

Besides the scientific quality of the presentations, I was quite impressed with how well they were timed and organized. Each talk was to last 20 minutes, including eventual questions from the audience, and not a single presentation out of 25 went long, while the switch between speakers always ran smoothly and quickly. I found this to be quite the impressive feat, both in terms of the technical prowess of the meeting organizers and of the scholarliness of the young — and one would assume generally relatively inexperienced — speakers.

This year’s MASAMB conference attendance was about 110, toward the high-end of the average, but it still felt quite ‘cozy’ for participants and reporters alike (well, for the only reporter, me). Speakers were mostly from UK institutions (e.g., Imperial College, UCL, University of Glasgow, University of Warwick, University of Bristol, Cancer Research UK, Brunel University, University of Manchester, University of Sheffield and the University of Reading), but there was also a significant representation of researchers from other European countries, including Cyprus (University of Cyprus), Germany (EMBL Heidelberg), Austria (Center for Integrative Bioinformatics and the University of Veterinary Medicine), Switzerland (ETH-Zürich), Poland (Polish Academy of Sciences), and Finland (Aalto University).

If I were a young scientist being trained in computational biology or bioinformatics in a European institution, I would try my best to attend MASAMB, and apply to either give an oral presentation or present a poster on my own research. Talking about posters, the poster count for this year’s conference was 35, which, according to Michael Stumpf’s concluding remarks, included “not a single stinker!” The high quality of the pool made it all the more impressive for the winners of this year’s best poster competition: Ann Babtie, Dominic Smith and Phoebe Jones from Imperial College for “A moment expansion approach for stochastic simulation and inference” and Agnes Jonas from the University of Veterinary Medicine of Vienna for “Modelling allele frequency trajectories of experimental evolution with fruit flies”. On presenting the awards, Stumpf remarked how pleasantly impressed he was that three of the four recipients were women, even though the vast majority of entrants were men. Well, you heard it, if you’re not just a young scientist, but also a woman, it’s time to do your best to attend the upcoming MASAMBs and extend the flattering gender-slanted tradition.

Well, attending MASAMB XXIII was an excellent experience, which would not have been nearly as pleasant or useful if it weren’t for the current and former members of the Stumpf laboratory. Aside from Michael himself, I had the opportunity to meet and converse (about science and everything else) with research fellows Tina Toni and Sarah Filippi, post-doc Juliane Liepe, graduate students Ann Babtie, Adam McLean and Delphine Rolando, and former Stumpf group member (now a post-doc at the University of Cyprus) Kamil Erguler. I sincerely thank them for their invaluable help and for making me feel very welcome. I feel Nature Protocols and I have now an ‘in’ into the world of bioinformatics research, and I look forward to receiving news and feedback on how Nature Protocols can be of more help to researchers in this field — right Juliane?

One last bit of information: the general preference is for the yearly MASAMB meeting to take place in the UK for two consecutive years, then somewhere else in Europe, before returning to these shores. Tentatively, MASAMB 2014 will take place at the University of Sheffield, a venue that was preferred by this year’s participants to the other two candidates, Warsaw and UCL. Stay tuned…

The phenome is a product of the genome and the exposome?

Last night I went to a public lecture at the University of Surrey organised by the Royal Society of Chemistry. Professor Ian Wilson spoke on the topic: “Mapping the Phenome: The analytical chemistry of life”.

I receive email alerts of talks like this, and was alerted by the fact that this was a topic that I was interested in (I have a past as a natural products chemist, and I edit quite a lot of metabolomics protocols), and that it was going to be happening in Guildford (which is closer to where I live than London is!).

The first comment to make is that this was a public lecture, so it was pitched at the level of an intelligent, interested person who had not necessarily had any formal scientific training. This talk was definitely a success; whenever I looked at the other people around me they were attentive and smiling.

The title of the talk mentions the phenome which, I suppose, looks at different phenotypes (as apposed to genotypes). As we know, organisms are somehow a product of their genome and their environment, and the point where I laughed and laughed was when he referred to the compounds that the organism is exposed to as being the “exposome”.

One part of the phenotype of an organism is its metabolome, and that was the main focus of the talk.  The title could equally easily have been: “Metabolomic analysis of urine” or perhaps “Pisse prophets of the past, present and future”.

Woodcut showing a wheel and chart that classify urine samples, shown in the blog: “Medium Aevum”.

Professor Wilson had a wooden rack for screw-top test-tubes which he opened and sniffed during the first part of his talk. He concluded this act by drinking one of them! While they all looked they might possibly be urine, they were in fact: coffee, pepsi, two strengths of tea, and scotch. He drank the scotch, apparently.

For the rest of the talk, he showed a lot of NMR spectra from urine samples of mice, rats and humans:

600 MHz 1H NMR spectrum of control rat urine, displaying hundreds of resolved peaks

 

… and Principle Component Analysis plots:

I know, I know, it is actually from a protocol for NMR of plants, but it is the nicest image that I can find in our content that looks like what Prof. Wilson showed in the talk.

At no point did he get bogged down with how the samples were prepared, what NMR was, or even what principle component analysis involved. What he emphasised was pattern recognition, and how you could start to see patterns in the NMR spectra for different mouse types, treatment groups, or people with different diets.

There was a feeling of optimism that this type of analysis would ultimately result in clinicians being better able to choose for each patient the best drug out of an array of possible treatments (i.e. the one most likely to help, and least likely to cause harmful side effects), because clinicians would be able to determine which pattern-group the patient belonged to.

 

 

 

Deadline Roulette

I didn’t mean to write about peer review again. Two things I never mean to write about are Peer Review and Impact Factors, but being an editor provides a privileged viewpoint on both so I seem to keep coming back to them. And here we go again:

This time the spur is a new paper in Scientific Reports that caught my eye called “How Important Tasks are Performed: Peer Review“. I wrote last month about the psychology of setting deadlines for referees

and so this line in the abstract made me sit up and take notice:  “the time a referee takes to write a report on a scientific manuscript depends on the final verdict”. The phrase “a Deadline-effect” also appears in the abstract. My interest was piqued. Did the authors have real data? Were they going to conclude that setting different length deadlines could change the decision on a manuscript?

Fractions of various decision: classes accepted (I), accepted with minor revision (II), to be revised (III), rejected (IV), not appropriate (V) from all reports (as an inset the same for short-duration processes) . Adapted from Figure 2b of ref. 1

Fractions of various decision: classes accepted (I), accepted with minor revision (II), to be revised (III), rejected (IV), not appropriate (V) from all reports (as an inset the same for short-duration processes) . Adapted from Figure 2b of ref. 1

The authors have looked at data from two journals: Journal of High Energy Physics (JHEP) and the Journal of Statistical Mechanics: Theory and Experiment (JSTAT). The journals don’t really matter, what is important is that they have access to data from these journals of every interaction with referees giving times for responses to review requests, how long it took them to return reports and what the decision was (on the paper). From this they can do lots of plotting of decision times and see that things seem to be covered by Poisson statistics which means that they can do some mathematical modelling. They also see that for those reports that come back fast, that is within a day, there is a much higher proportion of clear cut decision: Accept as is, or Reject.

I don’t think that either of those observations will surprise many people but there is more. For a start the two journals have different reviewing deadlines. JSTAT asks for reviews in 3 weeks, JHEP in 4. Both slower than Nature Protocols but then this is physics, a foreign country where they do things differently. Their data don’t support my comments on deadlines though because the shape of the distribution of return times for reviews is the same for both journals just that JHEP’s is spread over a longer scale.

Now because the distributions they get are Poisson looking they can be modelled with a series of stochastic steps. Referees are seen as people who spend their days doing little bits of action (sub tasks) each one taking about 10 minutes, that add up to a whole task. Every 10 minutes (approximately) the referee chooses what subtask to do based on importance of the overall tasks.  If that were all though the distributions wouldn’t be as they are, there would be power-laws involved and a long tail of reports that take a very long time to be completed. What stops this happening is the ‘Deadline-effect’. Because there is a deadline set on the task the referees know they have to spend a set amount of time before the deadline on the report. The clear-cut reports come in more quickly not because they have fewer sub-tasks but rather because the referees assess from the outset that these are going to be ‘easier’ sub-tasks to complete and so are likely to perform them with higher probability. Always pick the low hanging fruit first!

I can’t quite decide what take home message I have from this paper. It certainly suggests that clear deadlines and ruthless chasing are needed to get reports from referees. Perhaps though there is also a lesson for authors: If you want to get your paper reviewed swiftly, make it as easy as possible to review. That it took almost 3 months for this paper to pass through review might suggest that is a conclusion the authors didn’t draw for themselves.

1. Hartonen, T. & Alava, M. J. How important tasks are performed: peer review. Scientific Reports 3, 1679 doi:10.1038/srep01679

Model Behaviour

Model organisms are much used in modern biology. Generally small and easy to keep in the lab, these creatures serve as the ‘typical example’ of a type of organism or biological process. Fruitflies, mice, yeast, zebra fish, Arabidopsis, etc. The list of organisms that can be regarded as models sometimes seems so long that the concept is itself undermined; how long before we see the platypus championed as a model? Nevertheless the use of ‘standard’ creatures does allow the results from different laboratories across the world to be directly compared, always assuming that these labs are treating their models in a standard way.

nematostellacoverFor the study of critical steps in animal development researchers are increasingly turning to the cnidarians, a phylum that includes jellyfish and corals, as they retain relatively simple body plans and yet are more clearly multi-cellular organisms than the somewhat colonial sponges. This week we have published four protocols concerning the cnidarian Nematostella vectensis, more commonly known as the starlet sea anemone, to act as a very basic ‘starter kit’ for anyone wishing to work with this organism.

Nematostella is a native of the east coast of the United States. It spends its time buried in mud feeding through its mouth, which is surrounded by two rings of tentacles. Slightly paradoxically they are classed as ‘vulnerable’ by the International Union for Conservation of Nature, but are also behaving as invasive aliens on the south coast of England and the west coast of the United States. But they grow fast and prolifically in the lab and have a sequenced genome1.nprot_2013_044-F5

The four protocols take us through some essential steps in working with Nematostella. John Finnerty and colleagues describe their approach to collection rearing, spawning and regeneration (doi:10.1038/nprot.2013.044)2, Isolation of DNA, RNA and proteins (doi:10.1038/nprot.2012.151)3, and characterization of RNA and protein expression (doi:10.1038/nprot.2013.014)4. To complete the quartet, Mark Martindale explains how his lab approaches overexpression and knockdown studies in this versatile beastie (doi:10.1038/nprot.2013.009)5.

We are hoping that this collection of protocols will provide a useful resource for aspiring cnidarian biologists. We would also be keen to see anyone with experience of working with Nematostella presenting their own protocols in the Protocol Exchange. The cluster also raises the following question:

Are there other emerging model organisms that are crying out for similar attention?

References:

1. Putnam NH, Srivastava M, Hellsten U, Dirks B, Chapman J et al. Sea anemone genome reveals ancestral eumetazoan gene repertoire and genomic organization”. Science 317, 86–94 (2007).

2. Stefanik, D. J., Lauren E Friedman, L. E. & Finnerty, J. R. Collecting, rearing, spawning and inducing regeneration of the starlet sea anemone, Nematostella vectensis. Nature Protocols 8, 916-923 (2013).

3. Stefanik, D. J., Wolenski, F. S., Friedman, L. E., Gilmore T. D. & Finnerty,  J. R. Isolation of DNA, RNA and protein from the starlet sea anemone Nematostella vectensis. Nature Protocols 8, 892–899 (2013).

4. Wolenski, F.S., Layden, M. J., Martindale, M. Q., Gilmore, T. D. & Finnerty, J. R. Characterizing the spatiotemporal expression of RNAs and proteins in the starlet sea anemone, Nematostella vectensis. Nature Protocols 8, 900-915 (2013).

5. Layden, M. J., Röttinger, E., Wolenski, F. S., Gilmore, T. D. & Martindale, M. Q. Microinjection of mRNA or morpholinos for reverse genetic analysis in the starlet sea anemone, Nematostella vectensis. Nature Protocols 8, 924-934 (2013).

Nature Protocols at the 23rd MASAMB annual workshop

With the advent of technologies that have made large-scale genome sequencing projects possible and since a stream of high-throughput biological assays have been developed to collect, for instance, data on proteomics, metabolomics and gene expression, the need for ever more advanced, powerful and sophisticated bioinformatics tools has become an increasingly stringent fixture of today’s molecular biology research.

The Mathematical and Statistical Aspects in Molecular Biology (MASAMB) meeting has brought together every year since 1989 a relatively small number of researchers (usually around 100) from the fields of mathematics, statistics, computer science, bioinformatics, and biology to discuss and exchange ideas on methodological and applied research in an “intimate” workshop setting. This year’s MASAMB will take place on April 11th and 12th at Imperial College London, with the main topics of discussion being statistical bioinformatics, computational cell biology, next-generation sequencing, systems biology, and evolution.

Since their birth in 2006, both Nature Protocols and the Protocol Exchange (which was originally called the Protocols Network) have published a steady flow of protocols that can be categorized under the general term “computational biology”. Unsurprisingly, some of these protocols have proven very popular with our readership, with a number of these articles ranking among the journals’ most cited papers.

As we anticipate the number of published protocols in this field to increase further — as well as the interest in them from our readers — for the first time this year, we have decided to attend as a journal MASAMB, sending along one of our associate editors, well, sending along myself, Baldo Lucchese. I will be covering the workshop for Nature Protocols attending as many talks as possible and speaking to as many researchers and, hopefully, readers as humanly feasible. The objective will of course be to gain the wherewithal to make Nature Protocols a more helpful source for researchers in bioinformatics and statistical genetics and for readers with an interest in these fields. It will also be an excellent opportunity for me to meet in person a few of our authors. I certainly look forward to that too.

If you too are going to be at the conference, please do come by to say hi.

Stay tuned for the next blog post on this issue after I come back from MASAMB XXIII.

Two weeks is a long time in science publishing

Last week we got an email from one of our referees, who we were chasing for a report, asking a very common question not only for us on Nature Protocols but for editors in general. We ask referees to turn in their reports in 10 days, or let usknow if they need longer. “Why” asked our referee “10 days?”. He (or possibly she) went on to point out that Protocols aren’t the most time sensitive of publications and journals like Nature and Cell ask for 14 days for reviewing. Who does Nature Protocols think it is to be demanding such fast turn around times?

These are completely fair points, and the answer lies not in an overinflated opinion of our importance, but rather the psychology of the journal/referee relationship. A Protocol doesn’t have quite the same time pressure that primary research papers do, although many of our authors don’t seem to agree.

To start to answer this question there isn’t any real difference between 10 days and 14 days. Essentially editors ask for a return of a referees report in 2 weeks. The precise number reflects whether we are talking about calendar or working days; what we all mean is 2 weeks. Why not say 2 weeks then? Well we’ve found that some referees read 2 weeks and hear “2 clear weeks” or “the end of the week after next”, and so 2 weeks gets interpreted as 3.

Why 2 weeks? This is a mainly pragmatic call unrelated to how fast we actually need the reports back. Sure we aren’t going to worry too much if it takes 3 weeks or even a bit more to get a report back. But we do want to get a report back and we don’t want prospective referees to take on reviews if there isn’t a realistic chance of them getting the review done in less than a geologic age. Bitter experience has taught us editors that 2 weeks is about the longest time over which an average scientist can make an accurate estimation of their workload.

When you ask for 2 weeks the potential referees thinks “I’m not crazy busy at the moment, I can manage that” and chances are that the report will get written, albeit delayed by circumstances beyond their control, in something . If you say more than 2 weeks referees will think “well I’m crazy busy at the moment but it should get better soon so I should be able to do the review in a couple of week’s time” and they say ‘yes’. More than likely though things will turn up and things will still be ‘crazy busy’ in 2 weeks, and in another 2 weeks, and in another and so on. We end up doing what we hate, which is hassling referees who are helping us out of nothing more than altruism.

That’s probably more about the psychology of the editor/referee relationship than you need to know, but it does seem to be a counter-intuitive fact that the more time you offer a referee to do their review, the less likely it is that the referee will be able to complete the review anywhere close to that deadline.

So when an editor asks a researcher to review a paper in 10/14 days they are asking please can you review this paper in approximately 2 weeks, because if you can’t commit to reviewing within half a month then you shouldn’t be deceiving yourself; you haven’t time to review it at all.

Following science’s lead to reflect on the ethics of mitochondrial transfer

When I first mentioned to some colleagues that I was thinking of writing this post in the journal blog, a few quizzical expressions surfaced on the faces of Nature Protocols’ editors. After all, the ethical and philosophical implications of the protocols we publish aren’t the usual remit of Nature Protocols. Yet, when I found out that a method for mitochondrial DNA ‘transplantation’ introduced by Oregon Health & Science University’s Shoukhrat Mitalipov and co-authors is now technically almost ready for the fertility clinic1, my mind started to wander into all kinds of questions and considerations that I thought I’d like to share with my colleagues and the readers of this blog.

In 2010, Nature Protocols published “Chromosome transfer in mature oocytes2, by Tachibana, Sparman and Mitalipov, an article that details the transfer of chromosomes from the mature oocyte of a rhesus monkey to the enucleated egg from a different rhesus monkey, so that the resulting oocyte has the nuclear DNA of a female primate and the mitochondrial DNA of another. This protocol was based on the ground-breaking 2009 Nature paper “Mitochondrial gene replacement in primate offspring and embryonic stem cells3, which also reported that healthy monkeys had been born as a result of the procedure. These were monkeys that displayed no detectable presence of mitochondrial DNA of their biological mothers, but only that of the oocyte cytoplasm donor.

Mitochondria are often — and possibly too simplistically — called the cell’s power plants, because it’s in these cytoplasmic organelles that most of the ATP, the organism’s energy currency, is produced. Mitochondria have their own DNA (two to ten copies per organelle), which, as opposed to nuclear DNA, is passed en bloc from mother to offspring, without any paternal contribution.

Because of their role in ATP synthesis, mitochondria are exposed to a high concentration of free oxygen radicals, which, in conjunction with a lack of histones and limited mitochondrial DNA repair mechanisms, possibly explains why mitochondrial DNA mutations occur at a tenfold-plus rate compared with nuclear DNA mutations3. In humans, serious and often fatal disorders caused by mitochondrial DNA mutations affect 1 in ~4,000 children. Although current treatments alleviate symptoms and slow disease progression, no cures are available for these mitochondrial diseases.

At least in principle, a method that enables the complete replacement of mitochondria in the egg or embryo from a woman with known mitochondrial DNA defects with mitochondria from a donor with no such defects could act as an effective, ‘pre-emptive’ treatment of diseases linked to mitochondrial dysfunction. Just recently, Nature published another paper by Mitalipov et al.1, which reports how the approach described in the Nature Protocols 2010 paper2 has been successfully implemented to produce normally fertilized human zygotes that contained mitochondrial DNA only from the donors of oocyte cytoplasm (and not from the nuclei donors). These zygotes were found capable of developing blastocysts and of producing embryonic stem cells, which suggests that, if implanted in the womb, they could develop into healthy babies.

Of course, a breakthrough of this magnitude gives hope that a clinical application may not be too far down the road. This optimism is further encouraged by the significant success in achieving similar results in terms of mitochondria replacement in human embryos4 — albeit via a different approach — by a research group based in Newcastle, UK, and led by Professor Doug Turnbull. Incidentally, Dr Turnbull and co-authors published a method for the transfer of nuclear genome as a promising approach for the prevention of transmission of human mitochondrial DNA disease5 in 2010 in the Protocol Exchange.

The optimism, however, is tempered by substantial legal obstacles to the clinical application of these approaches. For instance, UK law currently forbids the genetic modification of human embryos or human eggs for treatment purposes, which prevents clinical use of both the approach developed by the UK-based group and the approach developed by the US-based one. In the US, the NIH restricts funding for research that destroys human embryos, so Mitalipov’s research group had to conduct its research using money from private donors6.

These legal and procedural hurdles are not mere technicalities, and a number of fundamental ethical and philosophical questions have to be univocally answered before the medical community embarks on the clinical use of pre-natal mitochondrial DNA replacement. Mitochondrial DNA only encodes 37 genes, or about 0.2% of our entire genetic make up. But the question still stands: what will be the exact relationship between a child and the woman to whom that child’s mitochondrial DNA originally ‘belonged’? Surely children who have not received their mitochondrial DNA from their biological mothers will look like their parents, but arguably efficient mitochondrial activity is vastly more important for the biology of a human being than the color of his or her eyes or whether his or her hair is straight or curly.

Furthermore, replacing a mother’s mitochondrial DNA does not make a difference just to her children, but given that it is passed down, more or less intact, from generation to generation along a matrilineal route, mitochondrial replacement may have permanent effects on many generations to come, including any possible unforeseen adverse consequences of the procedure. In order to observe, probe and record any such potential long-term adverse effects, subsequent generations of people who owe their mitochondrial genetic makeup to mitochondrial replacement will most likely have to be enrolled, basically at birth, in long-term, follow-up medical studies for decades to come; but presumably, once the age of consent has been reached, these individuals will have the right to refuse participation in such studies, won’t they? And what about their personal lives? Given the medical implications and the health concerns for their offspring, are the people involved going to be expected to disclose their genetic origin to partners they may want to have children with? A case could easily be made that the latter question applies only to female descendents of the woman who underwent the initial mitochondrial replacement. And shouldn’t the inherently discriminatory nature of this uneven burden be an additional cause for profound and unsettling moral questioning? After all, men are essentially genetic dead-ends when it comes to their mitochondrial DNA.

These are questions that no sensible person would ever volunteer to answer unless they had to, but we find ourselves exactly at that point in time. An answer must be sought and given, as the suffering of many men and women, children and babies may be avoided and their early death averted by the implementation of procedures to replace mitochondrial DNA. The UK government has launched a national, public consultation on mitochondrial replacement, which is to run until Friday December 7th 2012, and which will advise whether change in legislation is appropriate. At the very least, this consultation must serve to stress the fact that in democratic societies, a decision on whether to go ahead, and in which terms, with the clinical application of these techniques, ultimately rests with the will of its members.

I argue that the scientific community at large should feel a particular responsibility to contribute to the moral, ethical, and philosophical discussion that is taking place. Scientists, researchers and science experts in general are among the people who are best equipped to know, understand, and anticipate the wide range of implications and ramifications of applying a technique such as mitochondrial replacement to the treatment of mitochondrial diseases. Ultimately, the Nature Protocols blog is as good an informal venue as any to discuss these matters and to air one’s views on the trove of thorny questions forced open by the publication, among other articles, of protocols in Nature Protocols2 and the Protocol Exchange5

 

 

1.                  Tachibana, M. et al. Towards germline gene therapy of inherited mitochondrial diseases. Nature https://dx.doi.org/10.1038/nature11647 (2012).

2.                  Tachibana, M., Sparman, M. & Mitalipov, S. Chromosome transfer in mature oocytes. Nature Protocols 5, 1138–1147 (2010).

3.                  Tachibana, M. et al. Mitochondrial gene replacement in primate offspring and embryonic stem cells. Nature 461, 367–372 (2009).

4.                  Craven, L. et al. Pronuclear transfer in human embryos to prevent transmission of mitochondrial DNA disease. Nature 465, 82–85 (2010).

5.                  Craven, L., Tuppen, H., Taylor, R., Herbert, M. & Turnbull, D. Pronuclear transfer in abnormal human embryos. Protocol Exchange https://dx.doi.org/10.1038/nprot.2010.54 (2010).

6.                  Cyranoski, D. DNA-swap technology almost ready for fertility clinic. Nature https://dx.doi.org/10.1038/nature.2012.11651 (2012).

Introducing a new article type – the Protocol Update

Nature Protocols is coming to the end of its 7th volume, and after publishing only one type of article for the past seven years, this month sees the introduction of a brand new article type: the Protocol Update.

At first glance our first Protocol Update1 follows the same basic format as the hundreds of Protocols we’ve published so far.   However it is an acknowledgement that over time protocols are improved upon.  The major differences between Protocol Updates and Protocols are:

  • Protocol Updates have headers to say it is an update
  • Protocol Updates are always at the start of the issue
  • Protocol Updates  contain a statement at the start to make it clear it is an update of a protocol we published previously (back in 20062  in this first example).
  • Protocol Updates include a discussion of how this new version compares to the original, explaining the rationale for the improvements as well as making it clear which parts remain the same.

You may be wondering why we have introduced this new article type.  Whilst we have the functionality for authors and readers to comment on protocols, these comments are not peer reviewed and their presence at the end of a protocol means they can be missed by readers of the protocol.  For the particular protocol we have updated, the authors, referees and editors agreed that there were sufficient improvements to the procedure presented back in 2006 to justify publishing a new version.  The area covered – quality assurance for polychromatic flow cytometry – is basic but important to get right.  It is needed to support a diverse range of methods with many biological applications, and this importance has driven various improvements.  We decided we should acknowledge this and provide an updated protocol for its many users.  However as it is not a new protocol – the authors are the same, the applications the same, and even some of the text – we are not labelling it as a new protocol.  So you will see, if you compare the articles, that where there is new information, this is included, however where there is no change, but the information remains important for users of the protocol, it has been retained.

Given our large scope, and the many innovative new methods being developed, we don’t anticipate publishing many Protocol Update articles each year.  There is just too much exciting research going on and it is important to focus on covering these new protocols, plus those we have still not managed to cover in the past seven years.  The choice available to editors when commissioning new protocols can be overwhelming so we aim to continue to focus on commissioning topics we have not covered previously rather than revisiting what we have already published.  However, we felt we needed the option, occasionally, to update an area we’ve covered before.

If you have any comments and suggestions we are, as always, keen for feedback.

1Perfetto, S.P., Ambrozak, D., Nguyen, R., Chattopadhyay, P.K. and Roederer, M. Quality assurance for polychromatic flow cytometry using a suite of calibration beads.  Nat. Protoc.   7 2067–2079 (2012)

2 Perfetto, S.P., Ambrozak, D., Nguyen, R., Chattopadhyay, P. and Roederer, M. Quality assurance for polychromatic flow cytometry. Nat. Protoc. 1 1522-1530 (2006)