Everyone loves a game. So here’s a game that flexes that brain muscle, which can be adapted for all audiences, topics and required level of cuteness.

Presenting: the Animal Pairs Game.

I first produced this for a demonstration event at ThinkTank Museum in Birmingham, a Meet the Scientist day themed around evolution and adaptation. The idea was simple: pair up the most similar animals. So, among the laminated cards, each with striking images and brief descriptions, were two birds, two mammals, two insects and many other animal groups. Among them were animals from similar ecological niches with strikingly similar appearances, yet differing classification, such as the European hedgehog and the echidna; and similar animals with big differences in appearance, such as the hedgehog and a polar bear — one small, one big, both from very different habitats, yet both mammals. Among them, also, were a number of wildcards to provoke critical thinking: should the archaeopteryx, for example, pair with a bird or a reptile?

The full list of creatures was a veritable menagerie intended to provoke wonder and to broaden horizons about the natural world, and linked as much as possible with the museum’s taxidermy collection. Here, pre-paired, are what I presented:

Echidna – Platypus (Monotremes)
Hedgehog – Polar bear (Mammals)
Nautilus – Snail (Molluscs)
Turtle – Icthyosaur (Reptiles)
Fish – Shark (Fish)
Kakapo – Blue-footed booby (Birds)
Crab – Mite (Arthropods)
Bryozoa – Worm (Spiralia)
Butterfly – Beetle (Insects)
Coral – Sea anemone (Cnidaria, with a silent c if you please)
And the wildcards: the Archaeopteryx, Hagfish and Horeshoe crab

As you can see, many of them were pretty difficult, but the beauty of the activity was that cards could be removed for different audiences, and others reclassified (you could use a wider deuterostome/protostome classification, for example, or the lophotrochozoa/ecdysozoa split). You could make a big deal about living fossils, if you fancied, or just tell tales about your favourite animals. All in all, it had many children captivated, and kept their attention for a lot longer than other activities I have demonstrated in the past.

The activity could be tailored for any subject. For developmental biology, for example, you could stick with the protostome/deuterostome divide and ask which develop with a dorsal (like our spines) or ventral (like the Drosophila ventral nerve cord) nervous system, or which form mouth first… or alternative openings? Maybe you could use pictures to signify how similar the earliest stages of vertebrate embryology are? Plenty of developmental biology concepts could be introduced with weird and wacky pictures and a game to pair them, particularly for audiences who would never have seen anything on this topic before.

Here’s the downside: the game requires a lot of ongoing explanation, even for older children. I retired the bryozoa card early, for example, and found myself constantly explaining the differences between — on the surface, rather similar — creatures. But the reward for doing so was undivided attention, and evident fascination. To avoid this downside, consider carefully the details written on the cards below the pictures, and have clear examples on show. Alongside the activity I presented a poster of the tree of life, which I would recommend.

Also read Simon’s outreach post on his internship with the Naked Scientists, bringing developmental biology to the radio.

This post is part of a series on science outreach. You can read the introduction to the series here and read other posts in this series here.

(2 votes)

Loading...

Hello, my name is Helena and I am a PhD student within the Vascular Signalling Laboratory led by Mariona Graupera in the Bellvitge Biomedical Research Institute (IDIBELL) in Barcelona. It has been 4 years since I started my project in the lab, and before finishing my thesis research, we thought it was a good moment to explore another vascular signalling laboratory and learn from their knowledge and techniques. I just returned from a stage in Dr. Holger Gerhardt’s laboratory in London, funded by the Development Travelling Fellowship from the Company of Biologists.

During my visit at Dr. Gerhardt’s lab I have learned one of the most useful and interesting techniques in the vascular biology field: the generation of embryoid bodies. The embryoid bodies are three-dimensional aggregates of pluripotent stem cells that after stimulation with the vascular endothelial growth factor A (VEGF-A) can be differentiated into endothelial cells and generate vascular sprouts that will grow in between two collagen layers (figure 1).

Dr. Gerhardt’s team has helped me to create embryoid bodies generated from stem cells deficient of my protein of interest. This technique has offered me an excellent ex vivo approach to study in greater detail the role of my protein of interest in sprouting angiogenesis. The experiments that I have carried out during my stage in London will very nicely complement the in vivo work that I have been doing for the last years with the study of the retinal mouse vasculature. Besides the exciting experiments that I have done in London, I have also had the opportunity to meet and interact with different professionals involved in the vascular signalling field that have shared with me their knowledge.

Apart from the academic experience, my personal experience in London has also been fantastic. London has been a great city to spend these 3 months. It is a huge city with so many places, parks, markets and experiences to discover. Of course, compared to Barcelona, the weather was not the best thing to remember but I was lucky that I could enjoy quite a few sunny days!

This experience has been a very nice way to finish my PhD period and I sincerely thank to the Company of Biologists their support.

(7 votes)

Loading...

Here are the highlights of the current issue of Development:

Auxin biosynthesis: the root of xylem patterning

In the Arabidopsis root, xylem is organised into a central file of metaxylem that is flanked by protoxylem. Xylem fate is determined by HD-ZIP III transcription factors; high levels promote metaxylem formation whereas low levels specify protoxylem. The factors that downregulate HD-ZIP III levels are known but those that promote HD-ZIP III expression have remained elusive. Yunde Zhao, Ykä Helariutta, Jan Dettmer and colleagues now show that auxin biosynthesis promotes HD-ZIP III expression and metaxylem specification in Arabidopsis (p. 1250). The authors first isolate mutants that display defective xylem patterning and HD-ZIP III gene downregulation. These mutants harbour mutations in the gene encoding TRYPTOPHAN SYNTHASE BETA-SUBUNIT 1. Tryptophan is a precursor in the auxin biosynthesis pathway and, accordingly, the mutants exhibit aberrant auxin levels. They also show that metaxylem development and HD-ZIP III levels are defective in other auxin biosynthesis mutants. Based on their findings, the authors propose that tryptophan-dependent auxin biosynthesis is required for metaxylem formation.

From Hippo to planarians

The transcriptional co-factor Yorkie (Yki; YAP in vertebrates) is a key effector of the Hippo signalling pathway and has been implicated in growth control and patterning, as well as stem cell regulation and regeneration, in flies and vertebrates. Now, on p. 1197, Alexander Lin and Bret Pearson investigate the role of Yki in planarian flatworms. The researchers report that planarians have a single orthologue of yki and, using RNAi, they show that yki carries out pleiotropic functions. For example, they report that ykiis required for homeostasis of the planarian excretory system, which is analogous to the vertebrate kidney. The researchers also show that, in contrast to its role in flies and vertebrates, yki functions to limit stem cell proliferation and hence the size of the stem cell population. In addition, yki plays a role in axial patterning, where it acts synergistically with Wnt signalling to supress head formation. These, together with other findings, demonstrate that yki plays diverse yet non-overlapping roles in planarian biology.

Following the leader

Collective cell migration occurs in many developmental contexts but a full understanding of this process has been hampered by a lack of quantitative analyses in 3D in vivo contexts. Using the zebrafish lateral line primordium as a model, Darren Gilmour and co-workers set out to tackle this problem (p. 1282). The researchers develop a method to simultaneously live-label microtubules, centrosomes and nuclei, allowing them to map cell polarity and orientation across the migrating population. Using this method, they identify the transition between leader cells and followers within the collective and show that this transition is marked by changes in cell-cell adhesion; cadherin 2 is expressed across the tissue but is only assembled into adherens junctions (AJs) in the transition zone and further down the leader-follower axis. A tandem fluorescent protein timer-based approach reveals that AJs become progressively more stable along the leader-follower axis. Finally, they show that AJ assembly, but not maintenance, requires dynamic microtubules, revealing a key role for microtubules during leader-to-follower transitions within migrating collectives.

Dbx1 crosses the (mid)line

During nervous system development, navigating axons ‘decide’ whether or not to cross the midline. Various factors that influence axon guidance and midline crossing have been identified but it remains unclear if any one transcription factor can drive the complete midline crossing transcriptional programme. Here (p. 1260), Yasuyuki Inamata and Ryuichi Shirasaki report that a single homeodomain transcription factor, Dbx1, assigns midline-crossing identity at the progenitor stage in mice. The researchers show that Dbx1 is expressed in a subset of neural progenitors in the dorsal midbrain. Lineage tracing demonstrates that midbrain commissural neurons, which cross the midline, are generated selectively from Dbx1-positive progenitors. Furthermore, gain- and loss-of-function experiments show that Dbx1 is necessary and sufficient for midline crossing. Finally, the authors show that Dbx1 controls a molecular programme that controls the expression of Robo3, an essential regulator of midline crossing, on commissural neurons while repressing the ipsilateral neuron genetic programme. These findings reveal an unanticipated regulatory layer within the transcriptional cascade that controls nervous system wiring.

Lymphangiogenesis: of mice and fish

In mice, the formation of lymphatic vessels (lymphangiogenesis) requires the homeodomain transcription factor Prox1. Here, Stefan Schulte-Merker and colleagues examine whether the role of Prox1 is conserved in zebrafish (p. 1228). Using a novel transgenic reporter line, the researchers show that, in contrast to the situation seen in mice, zebrafish Prox1 is initially not expressed in all lymphatic precursor cells and reliably marks this population only during later stages of lymphangiogenesis, arguing against a role for Prox1 in lymphatic specification. In addition, targeted mutagenesis demonstrates that lymphangiogenesis can proceed in the complete absence of Prox1. Finally, they show that the functionally related transcription factors Coup-TFII and Sox18, which are implicated in lymphatic specification in mice, are also dispensable for zebrafish lymphangiogenesis. The authors conclude that an alternative lymphatic specification mechanism is present in zebrafish and propose that differences in the timing of lymphangiogenesis between mice and fish can explain this divergence.

Fresh air in the mesenchyme

The mesenchymal compartment of the lung plays a crucial role during lung development but, unlike its epithelial counterpart, its regulation is largely uncharacterised. Now, Gianni Carraro, Saverio Bellusci and colleagues report that miR-142-3p modulates WNT signalling to balance mesenchymal cell proliferation and differentiation during mouse lung development (p. 1272). Using microarray analyses, the researchers identify miR-142-3p as highly expressed in the embryonic lung mesenchyme. Importantly, loss-of-function assays demonstrate that miR-142-3pregulates cell proliferation specifically in the mesenchyme; in the absence of miR-142-3p, progenitor cells prematurely differentiate. They also show that miR-142-3p binds to and regulates the expression of mRNA encoding APC, a negative regulator of WNT signalling. Accordingly, miR-142-3p knockdown can be rescued by activating WNT or reducing APC expression in the mesenchyme. Based on their findings, the authors propose that miR-142-3p adds an extra layer of control to the WNT-FGF feedback loop that operates in the lung mesenchyme to correctly balance cell proliferation and differentiation.

PLUS…

Growing older gracefully – a review of the 10th edition of Developmental Biology

First published in 1985, Developmental Biology by Scott F. Gilbert has been an influential textbook for a generation of scientists. Here, Timothy Weil provides a brief review of the latest (10th) edition of the series. He comments on updates to the text, highlights details of particular interest to lecturers, and compares this book with other resources available in the internet era. See the Spotlight article on p. 1177

RNA polymerase II pausing during development

The transcription of developmental control genes by RNA polymerase II (Pol II) is commonly regulated at the transition to productive elongation, resulting in the promoter-proximal accumulation of transcriptionally engaged but paused Pol II. In their poster article, Bjoern Gaertner and Julia Zeitlinger review the mechanisms and possible functions of Pol II pausing during development. See the Development at a Glance article on p. 1179

Shared signaling systems in myeloid cell-mediated muscle regeneration

Much of the focus in muscle regeneration has been placed on identifying and delivering stem cells to promote regenerative capacity. As these efforts have advanced, we have learned that complex features of the microenvironment in which regeneration occurs can determine the success of these approaches . Here, James Tidball and colleagues discuss how myeloid cells can influence muscle regeneration, focussing on how processes in muscle and myeloid cells are co-regulated. See the Review on p. 1184

(1 votes)

Loading...

I am Serena Ding, a third year PhD student, and I work at the University of Oxford’s Biochemistry Department in the United Kingdom. I am interested in the control of cell divisions, specifically in stem cells. In Dr Alison Woollard’s lab, we use a microscopic nematode called Caenorhabditis elegans as a stem cell model.

C. elegans as a model organism

C. elegans are non-pathogenic nematode worms and a truly brilliant model organism. They are found in soil and rotten fruits all over the world. Our wild type worms came from a mushroom patch in Bristol, UK. The worms are small so you can keep ~1000 on a small Nematode Growth Media (NGM) plate like this. 

Hayley Lees, PhD student, holding a 55mm NGM plate

C. elegans naturally exist as hermaphrodites (99.99%) and males (0.01%). Hermaphrodites can self-fertilize and generate a clonal population, as well as mate with males for endless possibilities of genetics. Each worm can produce over 200 offspring in a few days so you will not have to wait very long to have lots of material to work with. C. elegans live for 20-30 days, with all the somatic cell divisions taking place over a 36 hour period, so from a developmental biology point of view, C. elegans presents an excellent opportunity to study complex developmental processes over a relatively short time window. Each worm has just under 1000 cells; the cell lineage is invariant and completely described, so it is possible to pinpoint exactly when and where things go wrong for whatever reason. This means you can study development at single-cell resolution within a whole organism. Last but not least, the genome has been completely sequenced and annotated, and there are many mutants available for various genes.

For these reasons, C. elegans is widely popular as a model organism. The biennial International C. elegans meeting is the biggest worm conference, attracting over 2000 scientists from all over the world working in areas such as aging, neurobiology, and regenerative science. There are various other worm conferences focusing on particular topics or on certain geographical regions. The C. elegans community is friendly and cooperative when it comes to sharing resources. The Center for Caenorhabditis Genetics (funded by National Institutes of Health) keeps a stock of strains that can be easily requested. WormBase is a fantastic online resource for C. elegans and other worms, which contains whole genome sequence, information on all mapped genes, upcoming meetings, forums to discuss topics such as “How many worms will fit into a Mini Cooper?” and so on.

Animal maintenance

In the laboratory we typically grow C. elegans on small NGM plates. We seed the plates with E. coli bacteria OP50 – we call this a “lawn” of bacteria – on which the worms feed. C. elegans happily lives at room temperature just on the lab bench, but depending on the experiment and other staging necessities, we grow worms at 12-26.5 °C in incubators.

Equipment room with incubators set to various temperatures

Below is a picture of what a worm lab bench looks like: lots of plates indeed to maintain different strains. Some people like to stack up their plates very high without tying them together with rubber bands (see the tower of plates on the right hand side), making their bench neighbors quite nervous about using a vortex mixer in case the tower collapses…

A typical worm lab bench

The plates do get contaminated at times, usually by bacteria or fungus and sometimes by mites. In this case we clean the worms either by frequent passaging to new plates or by bleach treatment. We can transfer worms using a worm pick, which is essentially a glass pipette with a piece of platinum wire sticking out of the top. We use a flame to sterilize the metal part before picking up a worm. Because platinum wires cool very quickly, we don’t have to worry about burning the worm. We make our own worm picks and everyone has different preferences – however, when the glass picks get dropped they do break, so it’s best not to develop strong attachment to a particular pick! Bleach treatment, on the other hand, works by killing the contaminants and bursting gravid worms open so they release bleach-resistant eggs, which are then retrieved and hatched. In addition to decontaminating, bleaching is also a handy way to synchronize a worm population, which is often necessary in order to study a particular developmental stage.

The worms self-fertilize and produce lots of offspring, so the plates get crowded quickly and run out of food. Therefore we “chunk” the worms once or twice a week by cutting out a small square of the agar with a few worms using a scalpel, and transferring it to a fresh new seeded NGM plate. If chunking wasn’t done in time and worms do starve, don’t worry, they go into a developmental arrest and can still live without food for months! As long as they have access to food later, they quickly recover and are happy again. Hence the worms are fairly low maintenance. We can also freeze strains in glycerol and store them in liquid nitrogen or at -80 °C for years.

Common techniques

RNA interference (RNAi) is a popular technique in C. elegans. RNAi libraries are commercially available and consist of bacteria containing clones that are designed to silence particular genes. It is easily performed in the worms: you select the feeding clone containing your gene of interest, grow it up in media and induce the expression of double-stranded RNA by IPTG, and let the worms feed on that bacteria – the rest is magic. However RNAi is inherently variable and behaves differently for different genes, so when mutants are available, people tend to prefer those instead. It is also not uncommon to using a combination of RNAi and mutants to study gene functions.

We regularly make transgenic worms using microinjection. We inject the DNA along with a selective marker into the gonad of young adults, and then look at the progeny for transformants and stable transgenic lines. A typical injection marker is unc-119. We inject unc-119 mutants, which are essentially paralyzed, with our desired plasmid plus the unc-119 rescuing plasmid. Then we look for progeny with rescued wild-type movement, which are the transformants. Some of the transformants will yield transgenic lines. This way, we can generate various transgenic worms, such as the one with fluorescent reporters below.

Transgenic worm with fluorescent reporters, generated by microinjection

We sometimes integrate the transgenes into the worm genome afterwards to achieve stable expression. This is done by giving the worms large doses of gamma irradiation. Recently, new techniques such as MosSCI and CRISPR/Cas had been developed to allow for single copy insertion of transgenes into a precise locations of the worm genome, thus allowing for genome editing.

Microscopy is a common feature of developmental biology research, and C. elegans provides a myriad of opportunities for fascinating microscopic work given its transparency and the relative ease of generating mutants and transgenic animals. The worms are transparent so you can see right through the cuticle into whichever cells or organ you are interested in, and additional resources such as Worm Atlas provide great guidance to the worm’s anatomy.

A typical day

No two days are the same, but as I arrive in the morning I generally chunk my worms and do some molecular cloning. After coffee and crosswords I may do some microinjections or set up some genetic crosses if I need to make new strains. Otherwise I spend lots of time on the microscope looking at various markers of cell divisions, both in the wild-type situation and in mutants/RNAi-treated worms to see what goes wrong. I leave work at the end of the day feeling tired but fulfilled, looking forward to return to my lovely little worms the next day!

This post is part of a series on a day in the life of developmental biology labs working on different model organisms. You can read the introduction to the series here and read other posts in this series here.

(14 votes)

Loading...

Organisation: Wellcome Trust – Medical Research Council Cambridge Stem Cell Institute

Studentship starting: 01 October 2014

Application Deadline: 1st April 2014

Interview Date: 29th April 2014

Programme Overview

This studentship is targeted to applicants with a Physical Sciences, Mathematical or Computational Sciences background, who are interested in applying their training to aspects of stem cell biology.

This programme provides students with an opportunity to spend time in three different labs during their first ‘rotation’ year, before deciding where to undertake their thesis work for years 2-4.

Physical Biology of Stem Cells

Stem cells are defined by their dual capacity to self-renew and differentiate into somatic cells. Great inroads have been made towards understanding how stem cells generate tissue and sustain cell turnover in tissue. At this time most of the inroads have been made by studying the individual biochemistry of the stem cell; much less progress has been made in understanding their function across scales – from molecules to tissue – or how they interact with their physical environment.

In studying the physical biology of stem cells, the aim is to identify and characterise the importance of physical, chemical, mathematical, and engineering considerations in the function of stem cells. This could include mathematical modelling of homeostasis in tissues, engineering controlled environments to control stem cell function, imaging and biotechnology, using single molecule approaches to study molecular interactions, systems biology, or investigating the importance of the stem cell’s response to forces in its environment.

The research generated by the MRC studentships should provide new foundations for biomedical discovery, biotechnological and biopharmaceutical exploitation, and clinical applications in regenerative medicine.

Qualification Eligibility

We welcome applications from those who hold (or expect to be awarded) a relevant first degree at the highest level. You should have a passion for scientific research, specifically with a Physical Sciences, Mathematical or Computational Sciences background.

Financial Support

All applicants must meet the MRC funding eligibility requirements outlined at http://www.mrc.ac.uk/Fundingopportunities/Applicanthandbook/Studentships/Eligibility/index.htm

To Apply

Please visit http://www.stemcells.cam.ac.uk/studentships/phy-biol/ for full details. Please note you will be required to complete and submit a departmental application form, a copy of current CV, provide two references and upload a copy of your transcripts as part of the application process.

Visit http://www.physbio.group.cam.ac.uk/ for details of the current Cambridge Physical Biology network.

Questions? Email: cscr-phd@cscr.cam.ac.uk

(No Ratings Yet)

Loading...

Supervisor: Dr. Brian Hendrich, Cambridge Stem Cell Institute, University of Cambridge

Microsoft Research Supervisor: Prof. Stephen Emmott

Application Deadline: 30 March 2014

PhD Start Date: 01 October 2014

Project Summary

Embryonic stem (ES) cells are a unique type of cell derived from the inner cell mass of the developing blastocyst, which possess the ability to self-renew indefinitely, and to differentiate into all somatic lineages; a characteristic known as pluripotency. Harnessing this potential makes them an attractive prospect for regenerative medicine, while understanding the decision-making procedures that determine differentiation is vital to our overall understanding of development. We aim to combine both state-of-the-art experimental and computational methods to uncover the processes that underlie cell fate determination. We are seeking an outstanding individual for award of a fully funded three year Microsoft PhD Scholarship. The candidate should have a strong background in biochemistry/developmental biology, knowledge of computational/mathematical methods, and the ability to contribute to both experimental work in the Hendrich lab and in computational development at Microsoft Research.

To Apply

Please visit http://www.stemcells.cam.ac.uk/studentships/microsoft/ for full details. Please note you will be required to complete and submit a departmental application form, a copy of current CV, provide two references and upload a copy of your transcripts as part of the application process.

Any questions? Email: cscr-phd@cscr.cam.ac.uk

(No Ratings Yet)

Loading...

DEVELOPMENTAL PATTERNING OF THE VERTEBRATE NERVOUS SYSTEM

NIMR project supervisor: James Briscoe (Developmental Biology)

The complex tissues and organs of every multicellular organism develop in a precise and reproducible manner from initially indistinguishable cells. A fundamental question is how such equipotent cells acquire the appropriate identity for their location. One example of this is the vertebrate central nervous system where the generation of an extraordinary array of neurons with distinct properties and functions is required for the assembly of neuronal circuits. In many developing tissues, including the CNS, naïve cells interpret graded signals, termed morphogens, as positional cues that organize the pattern of cellular differentiation. Our goal is to understand the molecular mechanisms controlling this process.

In ventral regions of the CNS, the secreted protein Sonic Hedgehog (Shh) acts as a morphogen to induce five progenitor domains in precise spatial order in the neural tube. Each progenitor domain is distinguished by the expression of different combinations of transcription factors and each domain generates a distinct neuronal subtype. The mechanism that produces this pattern remains poorly understood. To address this, we will use a combination of in vivo experimental manipulation and in silico analysis that will systematically decipher and model the neural tube network. The function of factors identified by these approaches will be examined and used to build, challenge and refine a model of neural tube development. The identification of the players and their functions within the network will offer insight into the mechanisms and principles controlling neural tube development. Moreover, since the operations of gene regulatory programmes underpin the development of all tissues we anticipate that our analysis will have broad implications for the development of many tissues. Collaborations with physicists and computational biologists have been established to support data analysis. This proposal offers interdisciplinary training in cutting edge techniques that will provide novel insight into transcriptional networks that control cell identity.

To apply: Please download and complete the Application Form and send it to studentships@nimr.mrc.ac.uk. The deadline for applications is on Sunday 23rd March 2014. On receipt of your application your two referees will be contacted. The deadline for submission of references is 12:00 noon (GMT) on Friday 28th March 2014. Your application may not be considered until your references are in place.

References

• Balaskas, N; Ribeiro, A; Panovska, J; Dessaud, E; Sasai, N; Page, Karen M; Briscoe, J and Ribes, V (2012)
  Gene regulatory logic for reading the Sonic Hedgehog signaling gradient in the vertebrate neural tube.
  Cell 148, 273-284 
  
• Jacob, J; Kong, J; Moore, S; Milton, C; Sasai, N; Gonzalez-Quevedo, R; Terriente, J; Imayoshi, I; Kageyama, R; Wilkinson, David G; Novitch, Bennett G and Briscoe, J (2013)
  Retinoid acid specifies neuronal identity through graded expression of Ascl1.
  Current Biology 23, 412-418 
  
• Cohen, M; Briscoe, J and Blassberg, R (2013)
  Morphogen interpretation: the transcriptional logic of neural tube patterning.
  Current Opinion in Genetics & Development 23, 423-428 
  

(No Ratings Yet)

Loading...

The first ever World Dicty Race  will require cells to navigate a complex microfluidic maze to reach a pool of chemoattractant at the finish line.  Diffusion of the chemoattractant will create a spatial gradient to guide cells along the shortest path to the finish line. The challenge is to engineer Dicty or HL60 cells to be both smart and fast!   As you know, where Dicty cells shine in precision, they lack in speed, and where HL60 are good sprinters,

they lack in precision. Thus, we are asking laboratories around the world to prepare and send us their fastest and smartest Dicty and HL60 cells.  Cells will compete against each other and against human neutrophils.  The race will take place in Boston, May 16 and winning Dicty team will get $5,000 and 15 minutes of fame at the Annual Dicty Conference.

Image: world racing dicty _thanks to Jonny Chang @ ASCB

You can get involved with the World Dicty Race in any of these three ways:

– Sign up as a participant on our website by March 14.  We only accept only one Dicty cell line from each team, but will send you devices to run the “qualifying race” in your lab.

– Share the news  about the race and our plain English project description site for the general public.

– Send us a note about the type of races that would be of interest for your area of research and will build together the microfluidic tools to make these race happen next year (email us at : dirimia@gmail.com).

(1 votes)
Loading...

The Node was full of activity in February. Here are some of the highlights!

Research:
 
– Jennifer Fish and Richard Schneider wrote about their recent paper studying jaw size evolution using quail and duck.

– Groups at the MPI-CBG in Dresden and Fritz Lipmann Institute in Jena showed that integrin and thyroid hormones promote expansion of progenitors in the developing neocortex.

– And a recent Cell paper uncovered the structural basis of why different auxin response factors are able to activate only specific gene subsets.

Model organism series:

Great additions to our ongoing series this month!

– A day in the life of an Arabidopsis lab, by Narender Kumar (Louisiana State University).

– A day in the life of an ascidian lab, by Alicia Madgwick and Marion Gueroult-Bellone (CNRS, Montpellier).

– A day in the life of a sea urchin lab, by Tanvi Shashikant (Carnegie Mellon University).

– A day in the life of a butterfly lab, by Leila Shirai (IGC Lisbon).

Outreach:

– Alison Woollard considered her experience presenting this year’s Royal Institution Christmas Lectures.

– Simon Bishop wrote about his internship at the Naked Scientists, bringing developmental biology to the radio.

Also on the Node:

– We reposted an article by SDB president Martin Chalfie, with his advice on getting the postdoc you want.

– Mirana wrote about how a travel fellowship to visit a collaborating lab helped her establish her own lab.

– Development made a short movie about the history of their covers and the beauty of developmental biology.

– and the Node will be at the Cold Spring Harbor Laboratory conference on Avian Model Systems.

Happy Reading!

(No Ratings Yet)

Loading...

When it comes to stem cell biology, there have been very few topics as fascinating and popular as cell reprogramming, the most famous reprogramming experiment being the one of Dolly the sheep. In stem cell biology, reprogramming refers to the concept of taking a fully specialized cell in the body and manipulating it in order to make it become another type of cell. One of the most popular approaches used by scientists to reprogram cells consists in taking a specialized cell and turn it into a pluripotent stem cell first. By definition, pluripotent stem cells can then be made to become any cell type of the body (differentiation) and kept indefinitely in the lab (self renewal).

One of the techniques used to reprogram cells into pluripotent stem cells is called somatic cell nuclear transfer (SCNT). It was used to create Dolly the sheep and consists in taking a specialized cell, extracting its nucleus (containing the genetic material), and transferring it into an empty egg (ie: the egg’s own nucleus was removed beforehand). It results in a viable embryo from which pluripotent stem cells (called embryonic stem cells) can then be isolated. Another approach, for which Prof. Yamanaka was awarded the Nobel Prize in 2012, consists in taking a specialized cell and introducing a few genes into it in order to force the production of a few key factors that induce pluripotency in the cell, producing what we call induced pluripotent stem cell (iPS).

When discovered, iPS-based reprogramming raised a lot of hope since it bypasses the need for an egg and the destruction of an embryo in order to obtain pluripotent stem cells, thus resolving one of the main ethical issues associated with stem cells. However, being so recently discovered, iPS cells are still under intensive scientific scrutiny to assess whether they are reliable and safe for clinical use.

In a recent report published in Cell Stem Cell, Le and colleagues compared mouse pluripotent stem cells obtained by SCNT versus ones obtained by iPS-based reprogramming. In the left panel of this picture, you can observe compact colonies of embryonic stem cells (ES cells) obtained from SCNT. On the right panel, you can observe similar compact shiny colonies of iPS cells. This shows that pluripotent stem cells obtained from both techniques have similar morphology; a morphology that is typical of “classically” obtained ES cells (ie: from a regular embryo). However, further down in their study, authors show that iPS cells have more genetic dysfunctions than SCNT pluripotent stem cells, demonstrating that SCNT is still superior to iPS-based reprogramming.

As a result, more studies are needed to understand which mystery factors in the egg are key to enhance the quality of iPS cells. So the decoding continues…

Picture credit:

Le, R., Kou, Z., Jiang, Y., Li, M., Huang, B., Liu, W., Li, H., Kou, X., He, W., Rudolph, K. L. et al. (2014) ‘Enhanced telomere rejuvenation in pluripotent cells reprogrammed via nuclear transfer relative to induced pluripotent stem cells’, Cell Stem Cell 14(1): 27-39. doi: 10.1016/j.stem.2013.11.005

(1 votes)

Loading...