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Dr. Srinivasan Vijayaraghavan

Ph.D; All India Institute of Medical Sciences, New Delhi, India

Research Interests:

The major interest in my laboratory is to understand, in molecular terms, the biochemical basis for the development of sperm function. The long-term goals of my research are to develop new approaches to regulate male fertility and understand the causes for infertility, management of fertility in man, domestic animals of economic importance, and endangered animal species.

Our laboratory was the first to show that a novel signal transduction system is centered around the sperm specific protein phosphatase isoform, PP1g2, of the serine/threonine phosphatase. This enzyme isoform, found only in mammals, is also indispensible for spermatogenesis. Knock out of the gene for this protein results in male infertility due to impaired sperm morphogenesis.

Changes in the activity of PP1g2 is also a key event in sperm motility development. A study of how changes in the activity of this and its associated enzymes occur during sperm development in the testis and epididymis is a major emphasis of this work. These studies include molecular and biochemical characterization of sperm PP1g2 targeting and regulatory proteins, including PKB (or cAKT) and PI3 kinase. Using gene knockout, transgenic and molecular approaches we are investigating the signal mechanisms underlying regulation of sperm protein phosphorylation and motility and the role of this unque mammal specific isoform in spermatogenesis.

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