Here is October’s round-up of some of the interesting content that we spotted around the internet:

News & Research:

– Bananas, Jesus on toast and polar bear disguises- some of the 2014 IgNobel Prizes! And since then the real Nobel Prizes have also been announced, with two prizes for Biology. The prize in Physiology or Medicine was awarded to the discovery of the positioning system of the brain, and the Prize in Chemistry to the developers of super-resolution microscopy.

– ‘Sometimes, the brightest stars in science decide to leave’- on life outside the lab, in Nature News & Comment.

– A patient is for the first time implanted with iPS cells, in Japan- here and here.

– Nature launched a new website devoted to science software, apps and online tools.

– ‘The man who grew eyes’- a feature article on Yoshiki Sasai’s research in Mosaic.

– A movie based on the Woo Suk Hwang cloning scandal has been a success in the Korean box office.

– Can you explain your research using an infographic? The Society of Biology is running a competition! The deadline is the 5th of November.

– And you can vote for who you think should be the Stem Cell Person of the Year 2014 until the 22nd of October!

Weird & Wonderful:

– Crocket is an unusual way to determine authorship order in a paper!

– Ever wanted to 3D print a frog dissection model? One of the several models available at the NIH 3D print Exchange website!

– Explaining how science works… using cookies!

– Cute DNA plush toys… with magnets for hydrogen bonds!

– And follow the ups and downs of life in the lab with the Lego Academics twitter account!

Peer 1: Brilliant! Accept with no changes; Peer 2: Groundbreaking! Accept with no changes; Peer 3: Reject. pic.twitter.com/KbLPuT24vu

— Lego Academics (@LegoAcademics) August 12, 2014

Beautiful & Interesting images:

– Chromosome sweets

– The winners of the FASEB BioArt image competition have been announced

– Beautiful chicken embryo

Chicken embryo RT @Powerfulpixs via @embryoproject pic.twitter.com/2rokc3L0DT

— the Node (@the_Node) September 3, 2014

Videos worth watching:

– A great animation video on the New York Times illustrates the discoveries of van Leeuwenhoek and the beauty of the microbial world.

– See the winners of the Stem Cell Video contest launched by the Knoepfler lab blog

– And we spotted this great video on chick development:

 Keep up with this and other content, including all Node posts and deadlines of coming meetings and jobs, by following the Node on Twitter

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Last Friday we came across the blog of the Sauka-Spengler lab in Oxford, and noticed that their PCR machines are called Kit and Kat. This made us think- who else gives pet names to their lab equipment? We asked the twittersphere for suggestions, and collated them in the storify below. How about your lab? Share the fun names of your lab equipment by leaving a comment!

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Researchers generate for the first time Drosophila melanogaster with intestinal cancer and reveal key genetic factors behind human colon cancer.

The scientists identify a human gene that favours the proliferation of tumour cells in early stages of colon cancer.

Furthermore, the flies are useful for faster and more economic drug screening.

Researchers at the Institute for Research in Biomedicine (IRB Barcelona) have managed to generate a fruit fly (Drosophila melanogaster) model that reproduces human colon cancer. With two publications appearing in PLoS One and EMBO Reports, the IRB team also unveil the function of a key gene in the development of the disease.

“The breakthrough is that we have generated cancer in an adult organism and from stem cells, thus reproducing what happens in most types of human cancer. This model has allowed us to identify subtle interactions in the development of cancer that are practically impossible to detect in mice with the current technology available,” explains the biologist Andreu Casali, Associate Researcher at IRB Barcelona and leader of the Drosophila project.

Although the flies do not have a colon, they have an intestine that includes a colon and rectum and that works in the same way as the human colon. The scientists generated mutant flies for two genes that are altered in most human colon tumours, namely APC and Ras. Thanks to the ease with which genetic studies can be performed in Drosophila, the researchers were able to examine the effect of 250 genes that are altered in these types of tumour and found that, of these, 30% affected growth while the others had no significant effects.

“The advantage of the model is that it allows us to explore genetic alterations more quickly, to distinguish between those that are important and those that are not, and to see what role they play,” explains Òscar Martorell, first author of the paper that appears in EMBO Reports published today. “Performing these genetic experiments in mice is time-consuming and costly and the Drosophila model allows us to rapidly analyse new pathways that could be relevant for colon cancer,” adds the co-author of the study, Francisco Barriga, a postdoctoral fellow working on colon cancer in vertebrate models. Undertaken over five years, the study is the result of collaboration between the Development and Morphogenesis in Drosophila Lab and the Colorectal Cancer Lab, both at IRB Barcelona.

Of all the genes that have a relevant function, the group focused on one called Mirror in Drosophila and lrx in humans. The experiments with flies led to the finding that this gene favours tumour growth in early stages of human cancer. “The problem with human cancer is that we know very little about what happens in the early stages. Our models allows us to better study its development.” Also, Casali goes on to speculate that the human gene lrx may become a good drug target “for example, to prevent benign adenomas from developing further.” However, first the validity of the gene as a therapeutic target has to be tested in mice.

A good in vivo guinea pig for drugs

The researchers also expound that flies can be used to study candidate drug molecules to combat cancer. Drosophila would serve as an intermediate step between the in vitro phase and testing in vertebrates. On the one hand, this model has the in vitro advantages because many molecules can be tested at a minimum dose, and on the other, it shares the advantage of animals models because, as it is a living organism, toxic molecules or those with poor absorption could be omitted very quickly.

“If there are 2000 promising molecules among a million tested in vitro, instead of testing them in mice, Drosophila could offer a good alternative to identify the two or three that are most appropriate. Both time and costs would be reduced,” explains Casali.

With this aim, Casali has start collaborating with the group headed by Ernest Giralt (IRB Barcelona)—an authority on pharmacological chemistry and peptide design—to use flies to test new families of molecules against cancer.

Reference articles:

Iro/Irx transcription factors negatively regulate Dpp/TGF-b pathway activity during intestinal tumorigenesis

Òscar Martorell, Francisco M. Barriga, Anna Merlos-Suárez, Camille Stephan-Otto Attolini, Jordi Casanova, Eduard Batlle, Elena Sancho and Andreu Casali

EMBO Reports (2014 Oct 8). 10.15252/embr.201438622

Conserved mechanisms of tumorigenesis in the Drosophila adult midgut

Òscar Martorell, Anna Merlos-Suárez, Kyra Campbell, Francisco M. Barriga, Christo P. Christov,

Irene Miguel-Aliaga, Eduard Batlle, Jordi Casanova, Andreu Casali

PLoS One (2014 Feb) doi: 10.1371/journal.pone.0088413

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There is something exciting about biologists joining forces with physicists and/or mathematicians, and finding a common language to solve biological problems that are just too complex to understand without stepping outside the realm of ‘traditional’ biology. At the recent EMBO conference on plant development, interdisciplinary studies were the main focus. And as the organiser of the meeting, Ottoline Leyser, stated ‘developmental biology is at the vanguard of this revolution because of its inherently multiscale focus’.

The location of the conference was the Sainsbury Laboratory, a new institute at the University of Cambridge in the UK (so not so far from the Node office!). This was a perfect location for the meeting. The Sainsbury Laboratory focuses on interdisciplinary plant developmental biology (the conference organisers is also the director the institute!) and is set in the grounds of the Cambridge University Botanical Gardens, where the beauty of the plant world is in display. Indeed, tours of the gardens where available at the end of the meeting, although unfortunately I didn’t have the opportunity to join. Here, I will highlight a few of what I found the most exciting presentations at the meeting.

The Sainsbury Laboratory in Cambridge, UK

Although the keynote lecture that kicked off the meeting was interdisciplinary, it was not about plant development. Or indeed about plants at all. The first speaker was Kristian Franze (University of Cambridge), who works on neural development. Ottoline Leyser explained the rationale: many years ago she persuaded the organisers of the British Society for Developmental Biology meeting to include a pollen tube researcher in the neurobiology session. It is was time, therefore, the do the opposite. Kristian started his talk by drawing parallels. Ramification of branches in tree must involve forces. Neurons also undergo ramification, but the neuro field has not been as good as the plant field at appreciating the importance of forces in development. His talk focused on his lab’s work understanding the forces and mechanics underlying neural development. Another speaker in the session was Olivier Hamant (École Normale Supérieure Lyon); according to Ottoline: ‘you can’t possibly have a session on mechanical forces in plants without Olivier’. Using atomic force microscopy his lab was able to examine the stress pattern of pavement cells, and how the organisation of stress in these cells impact on the orientation of MTs (recently published in eLife).

In the ‘self-organising tissue systems’ session, Jennifer Nemhauser (University of Washington) took interdisciplinarity to the ultimate consequences. Interested in understanding how auxin signalling works, but limited by the redundancy and complexity of the pathway, Jennifer collaborated with an engineer at her university to create a synthetic system in yeast that recapitulates auxin signalling (published in PNAS). Her talk demonstrated the power of synthetic systems to provide insight into developmental processes.

Poster session in the corridors of the institute- you can see the labs on the right handside!

In the ‘self-organising cell systems’ session, Claire Grierson (University of Bristol) talked about the self organisation of root hair morphogenesis. Her talk ended on an emerging theme- the importance of studying developmental biology to understand (and modify) ecology and the environment. As she explained, 30% of arable land is lost due to soil erosion. Her lab is starting to focus on how root architecture can play a role in preventing this phenomenon. José Feijó (Gulbenkian Institute/ University of Maryland) works on pollen tubes, one of the fastest growing cells in nature. He showed some beautiful microscopy of these cells in action, and showed how calcium signalling is involved in pollen tube growth and morphogenesis (published in Science). Also in this session, Ray Goldstein (University of Cambridge) talked about cytoplasmic streaming, the persistent circulation of fluid in eukaryotic cells that is driven by molecular motors. Fluid mechanics plays an important role in understanding this process, and Ray made a good case for the contributions of maths and physics in understanding self-organising systems in nature.

In the ‘comparative approaches’ session, Ken Shirasu (RIKEN) focused on Striga, a parasitic plant with incredibly destructive effects on agriculture. Part of its success relies on the ability of the thousands of seeds that each plant produces to only germinate when within 1mm of a host plant (such as wheat). These parasites are then able to connect their vasculature with that of the host via the formation of a structure called the haustorium. His lab has established P. japonicum has a model to study this type of infection. Meanwhile, Angela Hay (Max Planck Institute, Cologne) tried to understand the biology and mechanics behind the explosive seed dispersal method used by C. hirsuta, which can launch seeds up to 2 metres from the mother plant. Finally, Steve Smith (University of Western Australia) talked about karrikins, compounds that are present in the soil following forest fires, and which are able to trigger germination and influence seed photomorphogenesis.

Interdisciplinary science can apply to many biological questions. This conference highlighted just that, with collaborations with other fields helping solve questions in a wide range of biological problems, from basic developmental questions to environmental problems and crop issues. Interdisciplinarity will probably have an increasingly strong presence in Biology, and this meeting shows that plant researchers are at the forefront of this new trend.

One of the conference’s dinners, at Downing college

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Here are the highlights from the current issue of Development:

Small (molecule) steps to making bone

The repair of cartilage and bone following damage remains a clinical challenge. Current cell-based therapies rely mostly on adult mesenchymal stromal cells, but the expansion of these into correctly differentiated and functionally competent chondrocytes, which give rise to cartilage and then bone, remains problematic. Here, Naoki Nakayama and colleagues develop a small molecule-based approach that mimics the embryonic somitic chondrogenesis programme and can be used to differentiate mouse embryonic stem cells (ESCs) into chondrocytes in vitro (p. 3848). The authors first show that activation of Wnt signalling using a small molecule inhibitor of Gsk3 (CHR99021), together with inhibition of BMP signalling using a BMP type I receptor inhibitor (LDN193189), is sufficient to induce ESCs to form paraxial mesoderm-like progeny. This population, they report, expresses trunk paraxial mesoderm and somite markers but fails to express markers of sclerotome, which gives rise to cartilage. However, knowing that sonic hedgehog (Shh) and the BMP antagonist noggin are required for sclerotome induction in vivo, the researchers then demonstrate that short-term treatment of the mesodermal progeny with an Shh receptor agonist (SAG1) and the BMP inhibitor LDN193189 results in a sclerotome-like intermediate, leading to functional chondrocyte formation. When ectopically transplanted into immunocompromised mice, these chondrocytes were able to mineralise and form pieces of bone that contain marrow. This readily scalable and chemically defined method for directing chondrogenesis thus offers a promising approach for cartilage-mediated bone regeneration.

OTX2 gets a head start

The gene orthodenticle homologue 2 (Otx2) encodes a paired-type homeodomain transcription factor that is known to play a role in head morphogenesis. In the mouse, Otx2 is expressed in the anterior neurectoderm, where it is required for the differentiation of anterior neural tissues. Otx2 is also expressed in the anterior mesendoderm (AME) but its role here is unknown. On p. 3859, Patrick Tam and co-workers investigate the role of Otx2 in the AME. Using Otx2 AME conditional knockout embryos, the researchers show that Otx2 activity in the AME is essential for head formation. They further demonstrate that the expression of Dkk1 andLhx1, which are known regulators of head formation, is impaired in the AME of the Otx2conditional knockout embryos. Dkk1 is a direct target of Otx2, and the researchers further identify regulatory regions in the Lhx1 locus to which Otx2 can bind, suggesting that Lhx1 is also likely to be a direct target of Otx2. Finally, the analysis of AME-specific Otx2;Lhx1 andOtx2;Dkk1 compound mutant embryos reveals that Otx2 acts synergistically with Lhx1 andDkk1 in the AME during head formation. In summary, these findings uncover a crucial role for Otx2 during head and forebrain development.

A new TALE of PU.1 function

Numerous transcription factors (TFs), including PU.1 and Scl, are known to play important roles during haematopoiesis, but how these act within wider TF networks is unclear. Now, Berthold Göttgens and colleagues use transcription activator-like effectors (TALEs) to manipulate the expression of PU.1 and Scl and determine how these TFs function during developmental haematopoiesis (p. 4018). They first show that the modulation of PU.1 expression affects cell fate decisions during embryoid body haematopoiesis; PU.1 upregulation, for example, drives haematopoietic commitment but causes a loss of proliferative ability, whereas PU.1 repression inhibits the maturation and differentiation of early haematopoietic cells. They further report, using single-cell gene expression analyses, that TALE-induced PU.1 expression is associated with changes in the expression of several other haematopoietic genes, suggesting that early activation of PU.1 expression drives a haematopoietic programme at the expense of endothelial gene expression. Following on from this, the researchers show that the PU.1-14kb enhancer is active in the mid-gestation dorsal aorta in vivo, and that PU.1 is detectable in the early haemogenic endothelium. Together, these studies uncover a novel role for PU.1 during haematopoietic specification and highlight the use of TALEs in understanding developmental TF networks.

Modelling morphogen-controlled gene expression

Pattern formation during development often depends on the differential regulation of gene expression in response to a morphogen gradient, but how such gradients govern gene expression is unclear. A simplified view suggests that the morphogen activates a transcriptional activator, and that differential gene expression is dependent on the affinity or number of binding sites for this activator within target genes. However, this model does not account for bifunctional transcriptional effectors – those that function as activators and repressors – and has also been questioned by recent experimental results. Here, James Briscoe and colleagues describe a unifying mathematical model of morphogen-dependent gene expression that can explain recent counterintuitive findings (p. 3868). Using sonic hedgehog (Shh)-dependent patterning of the mouse neural tube as an example, the researchers develop mathematical models, based on statistical thermodynamic principles, that account for competitive binding of the active and repressive isoforms of Gli, the transcriptional effector of Shh, and that also represent other inputs that are known to regulate Shh target gene expression. Their modelling predicts that, for each Gli target gene, there is a neutral point in the Shh gradient, either side of which altering Gli binding affinity has the opposite effect on gene expression. They further report that inputs other than the morphogen determine the transcriptional response. Together, these analyses help reconcile conflicting results in the field and provide a theoretical framework that can be used to examine differential gene expression in other contexts.

PLUS…

 

The T-box gene family: emerging roles in development, stem cells and cancer

The T-box family of transcription factors exhibits widespread involvement throughout development in all metazoans. Here, Virginia Papaioannou provides an overview of the key features of T-box transcription factors and highlights their roles and mechanisms of action during various stages of development and in stem/progenitor cell populations. See the Primer on p. 3819

 

New insights into the maternal to zygotic transition

The initial phases of embryonic development occur in the absence of de novo transcription and are instead controlled by maternally inherited mRNAs and proteins.  Following this period of transcriptional silence, zygotic transcription begins, the maternal influence on development starts to decrease, and dramatic changes to the cell cycle take place. Here, Steven Harvey and colleagues discuss recent work that is shedding light on the maternal to zygotic transition. See the Review on p. 3834

 

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To form complex organs, somatic stem cells proliferate and then differentiate during development. In this process, intrinsic factors, i.e. the sequential expression of transcriptional genes, and extrinsic factors, i.e. extracellular microenvironment, are intimately involved. Recent in vitro studies have revealed that the physical properties of the extracellular niche, possibly tissue stiffness, may play an important role in cellular behavior, growth and differentiation. This is referred to as “mechanotransduction”. However, the procedure by which physical cues are sensed and translated into gene expression, and their physiological significance in vivo,are essentially unknown.

To understand the role of mechanotransduction in cellular behavior and fate specification during development, one of the critical points is to determine whether there are any spatiotemporal shifts in stiffness in a given developing tissue. Atomic force microscopy (AFM) is a strong tool for this purpose. Using this system, the stiffness in certain postnatal tissues including the brain has been previously examined. In our recent paper in Development, we combined this system with a structural support to measure stiffness in the embryonic mouse brain, one of the softest tissues in our body. We further combined this technique with immunostaining, to increase the spatiotemporal resolution of the measured tissue based on anatomical information (Figure 1A).

As a result, we obtained hitherto unknown results about the shift in stiffness in the developing brain tissue (Iwashita et al, 2014; Figure 1). First, stiffness in the proliferative zones including ventricular zone (VZ) and subventricular zone (SVZ) gradually increases during embryogenesis (Figure 1B). During brain development, gliogenesis starts around birth, after the neurogenic period takes place. Interestingly, previous studies showed in vitro that the lineage shift from neural to glial cells was influenced by a shift in stiffness. Our results provide an attractive scenario in which the extracellular environment, i.e. the stiffened tissue in the later stages of the embryonic brain, may be arranged for better production of glial cells in vivo.

Secondly, we found that there is a sharp peak in stiffness in the intermediate zone (IZ) and a gentle peak in the cortical plate (CP), at the middle stage of neurogenesis (Figure 1B, C). In addition, the stiffness in the IZ tends to be higher than other regions at the mid-stage of brain development. In the IZ, massive cell migration is observed during brain development. Although the physiological significance of the higher stiffness in the IZ is still unclear, it may contribute to directed migration of neural cells toward the CP.

To summarize, we described for the first time the spatiotemporal shift in stiffness that is observed in the developing brain. In this study, we measured the developing brain tissue and cellular stiffness as an experimental model. Our strategy, however, can be applied to profile various types of tissues and cells, and could help understanding the role of tissue stiffness as a physical cue for cell fate determination of somatic stem cells.

 Figure 1. Summary of spatiotemporal measurement using AFM (click image to see a bigger version)

(A) Immunohistological images of developing brains. Cortical layers consist of VZ, SVZ, IZ and CP. Preplate (PP) is a structure transiently appears in early phase of brain development. Red, Pax6; blue, Tbr2; green, Tuj1. This data is modified from Iwashita et al., 2014, Figure 2A.

(B) Schematics of the temporal shifts in stiffness in each layer. The vertical axis shows tissue stiffness. The horizontal axis shows the developmental time course.

(C) Schematics of the spatial shifts in stiffness of cortical layers in each developmental stage. The horizontal axis shows stiffness.

Misato Iwashita and Yoichi Kosodo

Iwashita, M., Kataoka, N., Toida, K., & Kosodo, Y. (2014). Systematic profiling of spatiotemporal tissue and cellular stiffness in the developing brain Development, 141 (19), 3793-3798 DOI: 10.1242/dev.109637

(5 votes)

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Last week, several of the Company of Biologists’ team de-camped to Surrey for our latest Workshop ‘From Stem Cells to Human Development’. Unlike previous events, this was a larger meeting, with 112 participants from all over the world. Organised by the editors of Development, the theme of the meeting (as implied by the title!) was how the use of stem cell technologies can inform our understanding of human development, and speakers covered a diverse array of topics – from the earliest stages of human development to generating different tissue types in vitro and using culture systems to understand organ morphogenesis as well as modelling disease. We also included presentations and a panel discussion on ethical aspects of human stem cell research – more on this in a later post!

Held in the beautiful surroundings of Wotton House, Surrey, the meeting proved a huge success – with a relaxed and collaborative atmosphere and plenty of time for discussion both during and between sessions. It also captured an exciting and growing field: now that we have the ability to generate many differentiated cell types (and tissues) from human stem cells in vitro, we can start to pick apart the mechanisms underlying our own development – and see the similarities and differences between humans and other mammalian systems.

Development will be publishing a formal meeting report in an upcoming issue; for now, here are a few photos of the event, as well as a Storify of tweets from the meeting – which we hope will give a flavour of this exciting workshop.

The poster sessions were hugely interactive – people had to be torn away from their posters to go back into the session!

The ethics session provided an important alternative view on stem cell research – what do we need to think about when planning our experiments and discussing our research with the public?

And outside the formal sessions, there was plenty of time for discussion – in the grounds of the venue, over meals and in the bar…

Look out for more on the Node on this workshop in the coming weeks!

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This post was originally published in the Knoepfler Lab Stem Cell Blog. 

Sometimes in science there are unexpected threads tying seemingly very different things together.

Unraveling the knots in these threads can lead to new insights into important developmental processes and mechanisms of disease.

My lab studies epigenomic and transcription factors including a molecule called histone variant H3.3 (more here on H3.3).

H3.3 binds to the actual thread of DNA to create very different kinds of chromatin states than those made by the more traditional canonical histone H3 family members. Think of H3.3 as the unorthodox member of the histone H3 family.

Recent studies have indicated that H3.3 plays key roles in both stem cells and cancer.

What’s going on?

H3.3 has a powerful, unique impact on which genes are turned on or off in cells and in turn how cells decide how to structure their chromosomes including both stem cells and cancer cells.

The jobs of H3.3 of essentially being a gene thermostat and of regulating genomic architecture are fundamental to a variety of cellular and organismal process including as it turns out both sperm development and brain tumors. For better or worse, H3.3 is a key conductor of both of these processes.

My lab just came out with a new paper in the journal Development in which we knocked out one of two genes that make H3.3 protein and got some surprising results. Wait, you say, two genes make H3.3? Yes. Histones more generally are unusual proteins in a number of ways including the fact that more than one histone gene will make exactly the same histone protein. This is, of course, very different than most protein-coding genes that follow the one gene-one protein rule.

The two genes that make H3.3 protein, H3f3a and H3f3b, are expressed differentially so cells may make their total pool of H3.3 protein only from the “a” gene or only the “b” gene or from both. We knocked out the “b” gene.

For about half the mice lacking “b”, this meant that embryonic development failed. Interestingly, almost every surviving “b” knockout mouse was infertile including all males and just about every female. Why did this happen? The b-deficient germ cells, the cells that make sperm in males and eggs in females, essentially had a monkey wrench thrown into their chromatin machinery due to the fact that they had very little H3.3 protein.

As a result, some genes switched inappropriately into “on” mode, while others that were supposed to be active were  switched off. The germ cell DNA was also not packaged properly. The end result was dead or dysfunctional sperm. In addition, earlier on in the spermatogenesis process, specific more primitive germ cell populations in the “b” knockouts died as well.

One of the most prominent epigenetic factors involved in this germ cell phenotype in the “b” knockout mice was a histone mark called trimethylation of lysine 9 of histone H3 (H3K9me3). Histone marks constitute a code that helps regulate gene expression and chromatin architecture. H3K9me3 seem to help shut genes off.

With very little total H3.3 protein in the “b” knockout mouse germ cells, H3K9me3 accumulated abnormally (see image above of immunostained testes from Figure 3B: blue is DAPI and green is H3K9me3, with the bottom gray panels being H3K9me3 alone). We think this excess H3K9me3 played a central role in germ cell dysfunction and in infertility in the knockouts, but other histone marks were altered as well.

Turns out that the other H3.3-coding gene, H3f3a aka the “a” gene, is also required for normal murine sperm development too, but in addition in the humans the human version of the “a” gene (called H3F3A) is mutated in some of the most lethal of all childhood brain tumors called glioblastoma and diffuse intrinsic pontine glioma (DIPG), both called high-grade gliomas more broadly. H3F3B (the human form of the mouse “b” gene) is mutated in other human childhood tumors including bone and cartilage tumors. Therefore, mutated histone H3.3 is a new oncoprotein and H3F3A and H3F3B may normally act as tumor suppressor genes in a variety of tissues including brain, bone, and cartilage. We think that what H3.3 is doing normally in germ cells to maintain fertility and what goes wrong  there when we lower H3.3 levels both have some things in common with what H3.3 is doing so wrong when it is mutated to lead to brain tumors.

One of our lab’s big picture goals is to help to develop new treatments for pediatric gliomas because today sadly most of these children die within just a year or two of diagnosis even with today’s best treatments.How these H3.3 mutations lead to these lethal brain tumors in kids is not clear, but our lab and many others are working to figure this out. You can bet that chromatin and epigenetics have a lot to do with it and surprisingly insights from how H3.3 normally functions in germ cell development could help us figure out how H3.3 leads to cancers when it is mutated in people.

Yuen, B., Bush, K., Barrilleaux, B., Cotterman, R., & Knoepfler, P. (2014). Histone H3.3 regulates dynamic chromatin states during spermatogenesis Development, 141 (18), 3483-3494 DOI: 10.1242/dev.106450

(4 votes)

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Here are some of the highlights for September:

Research:

– Sylvain discussed his recent Development paper on the tristable regulatory network behind cell fate decisions in the early embryo.

– Aryeh wrote about his research on spontaneous patterning of human ES cells, recently published in Nature Methods (he is also hiring a postdoc!).

– and Christelle highlighted a recent paper on the role of Runx1 in the haematopoietic lineage.

Meeting reports:

– Denise went to the annual meeting of the Society for Developmental Biology.

– Gary shared his thoughts on the recent Xenopus meeting in sunny California.

– and Danielle and Gi Fay reported from the joint Autumn meeting of the British Societies for Developmental Biology and Matrix Biology.

Future of Research Symposium:

A group of postdocs in the Boston area are organising a symposium to discuss what should change to make science better. A series of posts examines some of the issues that will be discussed:

    – How should scientists be trained?

    – Workforce structure– are there too many postdocs?

    – Metrics and Incentives

    – Is the level of funding appropriate?

Also on the Node:

– Joana asked for advice on designing ChIP primers.

– What do you think makes a perfect conference venue?

– And we reposted a Development editorial, on the ethical issues frequently encountered by the journal.

Happy reading!

(2 votes)

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