Development is a fascinating process that few people have a chance to see, let alone photograph! We recently participated with other scientists from the Crick Institute at a Science Museum Lates in London in February. For our activity, we built these inexpensive platforms that convert a user’s smartphone into a microscope screen.

We provided zebrafish embryos at different developmental stages for visitors to visualize and photograph. We showed visitors how to use the simple platforms that include a lens from a laser pointer for magnification. Once visitors had their phones lined up on the platform, they were able to view individual cells in early stage embryos or structures like the eye, brain, and heart in older specimens. We described the process of development from cell divisions to cell movements, gastrulation and segmentation. We found that the best practice was to mount embryos in sealed, agarose-coated petri dishes. This kept the embryo medium and zebrafish contained and the dishes were easy for visitors to manipulate. We also found that focal plane could be slightly different for various phones; it was helpful for visitors to remove phones from their cases.

Photo credit: Thomas S. G. Farnetti/Wellcome Images

 
Visitors were very excited to be able to take images like these with their smartphones. The event produced several shares on social media sites like Twitter and Instagram of pictures of zebrafish.

Photo credit: Alexis Webb

These microscope platforms are affordable and portable, making them suitable for demonstrations in schools and classrooms. Because they don’t require any power, they can be used outdoors or in areas that do not have electrical outlets. Imaging other types of live specimens is also possible. We hope that other researchers interested in showing off their model organism will consider using this type of low-tech, but high reward activity!
 

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.

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Here are the highlights from the current issue of Development:

Sara sorts out stem cell asymmetric division

Adult stem cells play crucial roles in tissue homeostasis, giving rise to both new stem cells and differentiating daughter cells. The generation of these two cell types often involves the asymmetric distribution of cell fate determinants, but how these factors are partitioned asymmetrically has been unclear. Now (p. 2014), Chrystelle Montagne and Marcos Gonzalez-Gaitan reveal a role for Sara endosomes in the asymmetric division of Drosophilaintestinal stem cells (ISCs). Using live imaging of the adult fly midgut, the researchers first show that Sara endosomes, which are characterised by the localisation of the endosomal protein Sara, are unequally partitioned during ISC divisions, being preferentially targeted to the presumptive differentiating cell. They further examine the distribution of Notch and Delta, which have been implicated in regulating ISC fate, and show that both Notch and Delta traffic through Sara endosomes and, accordingly, are also asymmetrically dispatched to the differentiating cell. Importantly, they demonstrate that midgut homeostasis is perturbed in Sara mutants; the number of ISCs in the midgut is significantly higher in Sara mutants than in controls, indicating that Sara endosomes play a central role in assigning ISC fate. These, together with other findings, uncover a cell-intrinsic endosomal-based mechanism for regulating cell fate and asymmetric cell division.

WNT takes a free ride

It is widely accepted that, in amniotes, WNTs secreted by the dorsal neural tube form a concentration gradient that regulates somite patterning and myotome organisation. Here, Olivier Serralbo and Christophe Marcelle challenge this assumption and uncover a novel mode of long-range WNT signalling in which WNTs are delivered to their target sites by migratory neural crest cells (p. 2057). The researchers first show that WNT1 protein is present on the surface of early migrating neural crest cells (NCCs) in the chick embryo. Furthermore, they demonstrate that the migration of NCCs is required for correct myotome organisation and for the WNT1-dependent activation of WNT11 in a somite derivative known as the dorsomedial lip (DML). These processes, in turn, are dependent on expression of the heparin sulphate proteoglycan GPC4 by NCCs; knockdown of GPC4 in NCCs, but not in DML cells, causes a reduction in WNT11 expression in the DML, highlighting a crucial role for GPC4 in donor but not receiving cells. Overall, these findings suggest a model in which WNT proteins are loaded onto migratory NCCs and are physically delivered to the receiving cells of the DML in a GPC4-dependent manner.

ELAVating insight into Hox RNA processing

Hox genes play a crucial role in assigning cellular identities along the anterior-posterior axis of animal bodies. Hox gene expression can be regulated via transcriptional mechanisms and recent studies have also uncovered a regulatory role for Hox RNA processing, yet the mechanisms underlying this regulation remain unknown. Now, Claudio Alonso and colleagues identify the neural RNA-binding protein ELAV as a key regulator of Hox RNA processing in the Drosophila embryonic central nervous system (p. 2046). The researchers use the Drosophila Hox gene Ultrabithorax (Ubx) as a gene model for investigating RNA processing and discover that elav mutants produce patterns of Ubx alternative splicing and polyadenylation that are distinct from those observed in wild-type embryos. They further demonstrate that ELAV binds directly to discrete elements within Ubx RNA. In the absence of elav, they report, Ubx mRNA and protein levels are reduced, whereas nascent Ubx RNA transcripts accumulate, suggesting that ELAV-dependent processing of Ubx RNA is able to fine-tune the levels of Ubx expressed. Furthermore, an analysis of the cellular pathways affected in elav mutants reveals a role for ELAV in Hox-dependent apoptosis. The authors thus propose a model in which ELAV modulates Hox RNA processing, expression and function in order to regulate local programmes of neural differentiation.

Ssm1b: a novel modifier of DNA methylation

A locus in mice known as strain-specific modifier 1 (Ssm1) has previously been shown to be responsible for the strain-dependent methylation of E. coli gpt-containing transgenic sequences. Now, Ursula Storb and co-workers identify the Ssm1b gene that underlies this phenotype and characterise its expression in early mouse embryos (p. 2024). Through extensive mapping studies, the researchers identify Ssm1b as a KRAB-zinc finger gene that is located on distal chromosome 4. They further demonstrate that Ssm1b is expressed in early embryos up until embryonic day 8.5 and, in line with this, its target transgene gains partial methylation by this stage. The Ssm1b gene lacks the conserved transferase sequence present in all DNA methyltransferases, but the researchers demonstrate that Ssm1b mediates transgene methylation via the de novo methyltransferase Dnmt3b. By contrast, they report, the methylated DNA-binding protein Mecp2 is not involved in Ssm1b-dependent DNA methylation. These findings, together with preliminary analyses of Ssm1b function, uncover a novel gene and highlight the existence of a new family of genes that can initiate DNA methylation and chromatin modification and hence are likely to be involved in the epigenetic control of early development.

Plus…

Adult neurogenesis: mechanisms and functional significance

Adult neurogenesis has been implicated in physiological brain function, and failing or altered neurogenesis has been associated with a number of neuropsychiatric diseases. Simon Braun and Sebastian Jessberger provide an overview of the mechanisms governing the neurogenic process in the adult brain and describe how new neurons may contribute to brain function in health and disease. See the Development at a Glance poster article on p. 1983

Apical constriction: themes and variations on a cellular mechanism driving morphogenesis

Apical constriction is a cell shape change that promotes tissue remodelling in a variety of contexts. Martin and Goldstein review the cellular machinery required for apical constriction and discuss how it can be tunedto regulate apical constriction in diverse cellular contexts. See the Review article on p. 1987

Cell migration: from tissue culture to embryos

Cell migration is a fundamental process that occurs during embryo development. Here, Concha and colleagues review the guidance principles of in vitro cell locomotion and examine how they apply to examples of directed cell migration observed in vivo during development. See the Review on p. 1999

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How great would it be if we knew how to reverse ageing and turn old organs into young ones? Actually, this might not be as crazy as it sounds. As a matter of fact, a team of scientists managed to regenerate the thymus in old mice and observe what closely resembles the juvenile thymus!

The thymus is a key organ of the immune system as it is where T cells, major actors of one’s immunity, develop and mature. In normal healthy people, the thymus degenerates with age (a process called thymic involution) and this results in a decline of the immune system function. Since our immune system is what protects us against diseases, it is evident that being able to restore the function of the thymus in elder people would be very beneficial.

Interestingly, in this study recently published in Development, Bredenkamp and colleagues achieved thymus regeneration in old mice. They observed a juvenile-like thymus after using genetic engineering to force the expression of the protein foxn1 in the aged thymus.

In this picture, you can observe the cortical thymic epithelial cell marker CDR1 in green and the medullary thymic epithelial cell marker keratin 14 (K14) in red. The cortex and the medulla are distinct regions of the thymus and they deteriorate during thymic involution. This results in reduced distinction between cortex and medulla as observed in the bottom picture taken in 24 months old mice. However, when foxn1 is over-expressed in the same 24 months old mice, you can observe that the clear distinction between cortex (green) and medulla (red) is restored, indicative of thymus regeneration.

In addition to the restoration of thymic architecture, the authors show that the regenerated organ has an increased T cell output and a gene expression profile similar to the juvenile thymus.

Most amazingly, apart from being able to “reverse ageing” in the thymus, they show that this regenerative process relies on the over-expression of a single factor (foxn1), making it a lot simpler than one might have anticipated! Thus, this study brings a new provocative concept that will most likely have a broad impact for regenerative biology.

Picture credit:

Bredenkamp, N., Nowell, C., & Blackburn, C. (2014). Regeneration of the aged thymus by a single transcription factor Development, 141 (8), 1627-1637 DOI: 10.1242/dev.103614

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6^th Young Embryologist Annual Meeting
Friday 27^th June 2014
JZ Young LT, Anatomy Building, University College London

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Our jobs page has been particularly busy this month, with a range of job positions from research technicians to senior lectureships! Here are some of the other highlights:

Research:

– Nikos wrote about what his work in Parhyale, recently published in Science, can tell us about the evolution of regeneration.

– The undergraduates at Reed College posted their second contribution, with a journal club discussion of a 2011 paper by Sasai and colleagues on eye morphogenesis in a dish.

– And Caroline re-posted a press release on a recent Development paper in which regeneration of the aged murine thymus was achieved by expression of a single transcription factor

Outreach: 

– Andreas was challenged to project cells onto buildings– cells that had been grown in micropatterns matching the buildings’ architecture. Read his post for more about this exciting outreach project in Paris!

– This month we announced the winners of our outreach metaphor competition. Congratulations to Ewart and Roel from the Hubrecht Institute!

Also on the Node:

– Lilian wrote about her favourite gene names. Share your favourite gene name by leaving a comment!

– We interviewed William Razzell, winner of this year’s Beddington medal, awarded by the British Society for Developmental Biology to the best PhD thesis. William did his PhD with Paul Martin at the University of Bristol, and worked on wound healing in Drosophila.

– Mariana wrote about her collaborative visit to Seville, where she produced the transgenic fish lines that will help her establish her new lab in Costa Rica.

– Megan reported from a state meeting of the Australia and New Zealand Society for Cell and Developmental Biology in New South Wales, Australia.

– And at a recent meeting we asked the Node readers to tells us what is the most exciting scientific advance of the last few years, and what is the best scientific advice they ever received. We collated their answers in this short video.

Happy reading!

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Salary: up to £27,004 depending on experience.

Applications are invited for a Wellcome Trust funded Research Assistant position to join an international team in the Gurdon Institute, University of Cambridge. We are looking for a highly motivated and well-organised person who is willing to learn new techniques to join a project using CrispR-mediated homologous recombination to perform targeted genetic engineering in Drosophila . The project is a collaboration between groups in Cambridge, Yale and Oxford and is funded by a Wellcome Trust Strategic Award for 30 months. Applicants should have a degree in a relevant area of biology. Experience in molecular biology or Drosophila genetics would be an advantage.

The Gurdon Institute is a world-renowned centre in the fields of developmental, cell, and cancer biology, located in the heart of the historic city of Cambridge, and part of the University’s School of Biological Sciences. Founded in 1991, its purpose is to provide the best possible environment for research, and to foster interactions and collaborations between scientists with diverse but complementary interests. It is generously supported by core funding from the Wellcome Trust and Cancer Research UK, and benefits from state-of-the art facilities in a friendly, modern, purpose-built environment (see www.gurdon.cam.ac.uk).

To apply online or view further information please visit: http://www.jobs.cam.ac.uk/job/3745

Applications should be submitted via the online application facility.

The University values diversity and is committed to equality of opportunity.

The University has a responsibility to ensure that all employees are eligible to live and work in the UK.

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Salary: up to £27,004 depending on experience.

Applications are invited for a Wellcome Trust funded Research Assistant position to join an international team in the Gurdon Institute, University of Cambridge. We are looking for a highly motivated and well-organised person who is willing to learn new techniques to join a project investigating polarised secretion in epithelia and how this is controlled by polarity factors. The project is a collaboration between groups in Cambridge, Yale and Oxford and will involve using new STED and PALM super-resolution microscopes to image polarized secretion in living tissues, and is funded by a Wellcome Trust Strategic Award for 30 months. Applicants should have a degree in a relevant area of biology. Experience in microscopy, molecular biology or Drosophila genetics would be an advantage.

The Gurdon Institute is a world-renowned centre in the fields of developmental, cell, and cancer biology, located in the heart of the historic city of Cambridge, and part of the University’s School of Biological Sciences. Founded in 1991, its purpose is to provide the best possible environment for research, and to foster interactions and collaborations between scientists with diverse but complementary interests. It is generously supported by core funding from the Wellcome Trust and Cancer Research UK, and benefits from state-of-the art facilities in a friendly, modern, purpose-built environment (see www.gurdon.cam.ac.uk).

To apply online or view further information please visit: http://www.jobs.cam.ac.uk/job/3743

Applications should be submitted via the online application facility.

The University values diversity and is committed to equality of opportunity.

The University has a responsibility to ensure that all employees are eligible to live and work in the UK.

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Last month we attended the joint meeting of the British Society for Developmental Biology and the British Society for Cell Biology in Warwick. At the time we had the opportunity to chat with Node readers, and gather their thoughts on two different questions:
 

– What is the most exciting scientific advance of the last few years?

– What is the best scientific advice that you have ever received?

We collated their answers in the short video below:

Which scientific advance would you highlight? And have you received advice that you would like to share? Share your thoughts by leaving a comment below!

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Department/Location: Wellcome Trust – Medical Research Council Cambridge Stem Cell Institute, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QR

Salary: £24,289-£27,318

Reference: PS03240

Closing date: 22 May 2014

Fixed-term: The funds for this post are available until 30 November 2016 in the first instance.

The Wellcome Trust – Medical Research Council Stem Cell Institute draws together outstanding researchers from 25 stem cell laboratories in Cambridge to form a world-leading centre for stem cell biology and medicine. Scientists in the Institute collaborate to generate new knowledge and understanding of the biology of stem cells and provide the foundation for new medical treatments.

Applications are invited for the position of research assistant in Dr. B. Hendrich’s research group.

You must be committed to a career in science and have previous experience with multidisciplinary projects. A wide range of techniques will be used and therefore you should have considerable laboratory experience. Practical experience in biochemistry (western blots, immunoprecipitations), molecular biology (real time PCR, RT-PCR, transfections, gene cloning), and mammalian stem cell culture is essential. Experience in human ES cell or iPS cell culture would be advantageous.

The ideal candidate will have experience in molecular and cell biology and be familiar with the principles of good laboratory practice. Good interpersonal/communication and note-keeping skills are essential, as is the ability to work independently as well as within a laboratory team, as required. You may be required to give oral presentations of your research work to other lab members and prepare written reports for your supervisor. You should also be willing to present your work in oral or poster form at international meetings. The post will require frequent weekend work and a flexible approach to working hours. Careful observation and accurate record keeping are essential.

You should have been awarded a BSc degree or equivalent and have several years basic laboratory experience.

The position will be under the direct supervision of Dr. Brian Hendrich, and is funded by the European Commission 7thFramework Programme Project “4DCellFate.”

Once an offer of employment has been accepted, the successful candidate will be required to undergo a health assessment.

To apply online for this vacancy and to view further information about the role, please visit: http://www.jobs.cam.ac.uk/job/3792. This will take you to the role on the University’s Job Opportunities pages. There you will need to click on the ‘Apply online’ button and register an account with the University’s Web Recruitment System (if you have not already) and log in before completing the online application form.

Please upload your current CV and cover letter with your application by 22^nd May 2014.

Informal enquiries are also welcome via email: cscrjobs@cscr.cam.ac.uk.

Interviews will be held week commencing 2nd June 2014. If you have not been invited for interview by 30^th May 2014, you have not been successful on this occasion.

Please quote reference PS03240 on your application and in any correspondence about this vacancy.

The University values diversity and is committed to equality of opportunity.

The University has a responsibility to ensure that all employees are eligible to live and work in the UK.

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Applications are now invited for a lecturer in the Department of Anatomy, University of Otago, New Zealand.

Job details: https://otago.taleo.net/careersection/2/jobdetail.ftl?lang=en&job=1400800

Department of Anatomy: http://anatomy.otago.ac.nz/

I’m happy to answer any questions you have about working at Otago.

Dr Megan Wilson

meganj.wilson@otago.ac.nz

@DrMegsW

Developmental Biology laboratory, Department of Anatomy.

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