Genes are the "code" for building the biological elements that form an organism. The DNA that makes up genes contains the instructions to synthesise proteins, but it's wrong to think that, for a given gene, these instructions are always the same for all parts of the organisms. In actual fact, the gene varies depending on the tissue where it is located (cerebral cortex, cerebellum, olfactory epithelium, etc.); in particular, what varies is the point in the "string" of code at which protein synthesis starts. This complexity complicates the work of scientists considerably, but projects like FANTOM come to their aid. FANTOM is in fact an international consortium that brings together several dozens of laboratories worldwide and has recently published a paper providing an exhaustive map of these specificities. The Neurogenomics Laboratory of SISSA, coordinated by Stefano Gustincich is among the participating laboratories.
"FANTOM has existed for about fourteen years and the published paper is the result of the fifth phase of the project," explains Stefano Gustincich. "Each of the participating laboratories sent in several biological samples all of which were examined using the same methodology".
In particular, the researchers used CAGE technology which, unlike more traditional methods, analyses only the first nucleotides of messenger RNA. Messenger RNA is a small piece of genetic material that the DNA uses to sythesize proteins, a sort of carbon copy of part of the information contained in the gene. Nucleotides are the small beads that make up the "string" of DNA and RNA. "By analysing the first nucleotides we are able to identify which sequence of gene starts the transcription. For any given gene, this sequence in fact changes depending on the tissue in which it is located. This way, we know where the gene starts to do its work" continues Gustincich. "Finding the beginning of the active portion also enables us to identify the 'promoter', that i
|Contact: federica sgorbissa|
International School of Advanced Studies (SISSA)