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Researchers at the Whitehead Institute have shown that a common genetic variant increases the risk of contracting type 2 diabetes. The variant, a single nucleotide polymorphism (SNP) in a gene called PPAR gamma, is carried by billions of people and helps to explain why some people are more likely than others to contract diabetes. The study, published in the September issue of Nature Genetics, has several implications: it offers new insights into the underlying causes of diabetes and more generally provides a blueprint for analyzing the role of SNPs in disease.

For more than half a century, the field of human genetics has harbored a gender bias about the relative contribution of males versus females to human evolution. Since 1947, when biologist J.B.S Haldane suggested that the rate of genetic mutation is much higher in the male germ line than in the female germ line, geneticists have credited males with much of the evolutionary changes that occurred in the 5 million years since human ancestors departed from chimpanzees.

The Human Genome Project (HGP) and The SNP Consortium today announced plans to generate a new set of human DNA sequence information that will contribute 125,000 to 250,000 validated and useful genetic markers known as single nucleotide polymorphisms, or SNPs. The information also will enhance the HGP working draft sequence of the human genome.

The Whitehead Institute for Biomedical Research today announced a new program for Computational Biology, a scientific discipline regarded by researchers as critical to advancing gene research. The Computational Biology Fellows Program at the Whitehead Institute, with funding and scientific support from Pfizer Central Research, will begin with two Fellows, who will conduct independent research at the interface of biology, computer science, and mathematics.

In a promising new advance in vaccine development, scientists have identified a protein fragment that is exceptionally potent in eliciting an immune response against infected cells and cancer cells. When scientists injected a vaccine containing this fragment into mice lacking a healthy immune system, the animals were able to mount a cellular immune response despite their compromised immune system.

Of the 46 human chromosomes, 44 are members of identical pairs. But two—the X and the Y—stand apart because they have no perfect match. Nevertheless, evolution has charged these two genetic loners with the critical task of sex determination: embryos with two X chromosomes develop into females, while embryos with an X and a Y chromosome develop into males.

One of the biggest challenges in cancer treatment is choosing the right regimen for a given patient. Treatment strategies work differently for different tumors. In choosing effective treatments with minimal side effects, oncologists rely heavily on biopsy reports that diagnose the tumor type involved. However, even today, cancer diagnosis is done the old-fashioned way: by observing morphological changes in biopsies under the microscope. The method suffers from serious limitations because cancer cells that look similar under the microscope can follow different clinical courses and respond differently to therapy. Now, in a new study reported in Friday's Science,a team of Whitehead-led researchers reports the first systematic and objective approach for identifying and classifying tumor types.

Scientists have achieved a major step toward finding a new class of oral drugs to treat HIV infection. They have identified a class of compounds that prevent HIV infection by stopping the virus at its port of entry into the cell. Unlike currently used drugs that target HIV at other points during its life cycle — after it has already infected the cell — these compounds lock into a vulnerable "pocket" in the HIV's coat protein, preventing its fusion with cell membranes and thereby its ability to enter and infect cells.