2015 June

Environmental epigenetics meets marine invertebrates

Posted by | Chromatin, DNA, Epigenetics, Histones, Marine Biology, Omics, Toxicology | No Comments

Environmental epigenetics investigates the cause-effect relationships between specific environmental factors and the subsequent epigenetic modifications triggering adaptive responses in the cell. Given the dynamic and potentially reversible nature of the different types of epigenetic marks, environmental epigenetics constitutes a promising venue for developing fast and sensible biomonitoring programs. Indeed, several epigenetic biomarkers have been successfully developed and applied in traditional model organisms (e.g., human and mouse). Nevertheless, the lack of epigenetic knowledge in other ecologically and environmentally relevant organisms has hampered the application of these tools in a broader range of ecosystems, most notably in the marine environment.

Fortunately, that scenario is now changing thanks to the growing availability of complete reference genome sequences along with the development of high-throughput DNA sequencing and bioinformatic methods. Altogether, these resources make the epigenetic study of marine organisms (and more specifically marine invertebrates) a reality.

vicky_600x400rodri_600x400We have built on this knowledge to develop a review/perspectives paper on this topic, recently published in the journal Marine Pollution Bulletin. This work (conducted by Victoria Suarez-Ulloa and Rodrigo Gonzalez-Romero, grad student and postdoc at Chromevol, respectively) provides a timely perspective highlighting the extraordinary potential of environmental epigenetic analyses as a promising source of rapid and sensible tools for pollution biomonitoring, using marine invertebrates as sentinel organisms. This strategy represents an innovative, groundbreaking approach, improving the conservation and management of natural resources in the oceans.

 

is it a boy or a girl?

Posted by | DNA, Evolution, Genetics, Molecular biology, Research | No Comments

Sex determination is an extraordinarily complex mechanism. During this process, signals of different nature (genetic, epigenetic, environmental, etc.) interact with each other, often in a hierarchical manner, to produce a male or a female embryo. Historically, the study of sex determination has relied on insect models (specially the fruit fly Drosophila) due to their short generation time as well as to the presence of very well developed genetic toolkits.

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Ten years ago we started a collaboration focused on this topic with the laboratory of Dr. Lucas Sanchez at the CIB-CSIC (Spanish Research Council, Madrid), investigating the evolution of the different components (proteins and genes) of the sex determination cascade in insects. Our latest results on this subject have been published this week by the journal Genetics. In this work we describe an unusual variation in the sex determination mechanism of sciara flies (gnats). More specifically, we find that the gene doublesex (responsible for discriminating between male-specific and female-specific developmental plans) does not seem to play that role in these insects, as suggested by the presence of non sex-specific doublesex transcripts in both males and females. This feature sets Sciara apart from other insects, revealing not only their divergent nature but also the extreme plasticity of sex determination mechanisms in nature.

Chromevol gets seed funds to study oyster responses to red tides

Posted by | DNA, FIU, Oysters, Red Tides, Research, Technology | No Comments

The Biomolecular Sciences Institute at FIU has awarded Chromevol with seed funds to investigate the epigenetic mechanisms participating in the responses of the Eastern oyster (Crassostrea virginica) to Florida Red Tides (caused by the dinoflagellate Karenia brevis) in the Gulf of Mexico. This research is developed in collaboration with Dr. John Berry from the Dept. of Chemistry and Biochemistry, and it complements our work focused on mussels exposed to okadaic acid in the NE Atlantic. Tomorrow we’ll be doing the first oyster exposure experiments in the Ecotoxicology Laboratory (Dr. Gary Rand) at FIU, using K. brevis cultures provided by Dr. Kelly Rein in the core facility for the culture of toxic algae!

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NSF Grants Conference, Jun 1-2, 2015 (Tampa, FL)

Posted by | Awards, Outreach, Research, Technology | No Comments

The last couple of days we have been attending the NSF Grant meeting hosted by the State University System of Florida at the University of South Florida. In addition to multiple talks and presentations facilitating key information for future NSF applications, we have had the opportunity to interact with fellow scientists and administrators sharing common research and outreach interests.
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