Ten years ago, scientists announced the end of the Human Genome Project, the international attempt to learn which combination of four nucleotidesadenine, thymine, cytosine, and guanineis unique to homo sapien DNA. This biological alphabet helped researchers identify the approximately 25,000 genes coded in the human genome, but as time went on, questions arose about how all of these genes are controlled.
Now, Harvard Stem Cell Institute Principal Faculty member Alexander Meissner, PhD, reports another milestone, this time contributing to the multilayered NIH-funded human Roadmap Epigenomics Project. Epigenetics is the study of how the over 200 human cell types (e.g., muscle cells, nerve cells, liver cells, etc.) can have an identical compliment of genes but express them differently. Part of the answer lies in the way that DNA is packaged, with tight areas silencing genes and open areas allowing for genes to be translated into proteins. Stem cells differentiate into various cell types by marking specific genes that will be open and closed after division.
New research by Meissner, published online as a letter in the journal Nature, describes the dynamics of DNA methylation across a wide range of human cell types. Chemically, these marks are the addition of a methyl groupone carbon atom surrounded by three hydrogen atoms (CH3)anywhere a cytosine nucleotide sits next to a guanine nucleotide in the DNA sequence.
Meissner's team, led by graduate student Michael Ziller, at Harvard's Department of Stem Cell and Regenerative Biology mapped nearly all of the 28-million cytosine-guanine pairings among the 3-billion nucleotides that make up human DNA, and then wanted to know which of these 28 million are dynamic or static across all the cell types.
"When we asked, how many of them are changing, the answer was a very small fraction," said Meissner. The researchers found that eighty percent of the 28-million cytosine-guanine pair
|Contact: B. D. Colen|