Essential Processes of Life in the Genome Imaged

Rafael Carazo Salas from the department of genetics at the University of Cambridge (UK) combined high-resolution, three-dimensional (3-D) confocal microscopy and computer-automated analysis of the images to survey the fission yeast genome with respect to three major cellular processes simultaneously: cell shape, microtubule organization and cell cycle progression.

Of the 262 genes whose functions the team report in a study published October 27, 2014, in the journal Developmental Cell, two-thirds are linked to these processes for the first time and a third are implicated in multiple processes. “More than 10 years since the publication of the human genome, the so-called ‘Book of Life,’ we still have no direct evidence of the function played by half the genes across all species whose genomes have been sequenced,” explained Dr. Carazo Salas. “We have no ‘catalogue’ of genes involved in cellular processes and their functions, yet these processes are fundamental to life. Understanding them better could eventually open up new avenues of research for medicines which target these processes, such as chemotherapy drugs.”

Using a multidisciplinary approach that took the scientists over four years to develop, the researchers were able to manipulate a single gene at a time in the fission yeast genome and see simultaneously how this affected the three cellular processes. Fission yeast is used as a model organism as it is a unicellular organism—in other words, it consists of just one cell—whereas most organisms are multicellular, yet many of its most fundamental genes carry out the same function in humans, for example in cell development.

The technique enabled the researchers not only to identify the functions of hundreds of genes across the genome, but also, for the first time, to systematically ask how the processes might be linked. For example, they found in the yeast—and significantly, confirmed in human cell studies—an unknown association between control of microtubule stability and the machinery that repairs damage to DNA. Many conventional cancer therapies target microtubular stability or DNA damage, and while there is evidence in the scientific literature that agents targeting both processes might interact, the reason why is still undetermined.

“Both the technique and the data it produces are likely to be a very valuable resource to the scientific community in the future,” added Dr. Carazo Salas. “It allows us to shine a light into the black box of the genome and learn exciting new information about the basic building blocks of life and the complex ways in which they interact.”

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