Genetherapy

Story Summary: Now researchers at the Stanford University School of Medicine have shown that a protein that controls DNA accessibility is responsible for the cells unruly ways. But neural crest cells are a spectacular example of migratory cells that are capable of becoming over 100 different cell types, including neurones, the bone and cartilage of the face, jaw and teeth, pigment cells and certain heart structures. Wysocka is the senior author of the research, which will be published online Feb. 3 in Nature. Most DNA in a cell is tightly wrapped around proteins and compacted into what is called chromatin. Choosing which portions of DNA to expose and which to keep tightly bundled can control cell fate. And yet, CHD7s involvement in CHARGE indicated that this chromatin remodeller is a critical component of the proper migration and specialisation of the neural crest. The neural crest forms early in development (in humans, at three to five weeks of gestation) when a portion of the cells that will become the embryo folds inward into a tube that will become the brain and the spinal cord. For obvious ethical reasons, the researchers couldnt study the effect of tweaking CHD7 levels in human embryos. Because the problems occur so early in development, Wysocka and her colleagues turned to frog embryos to test how CHD7s activity affected neural crest cells in a living animal. Researchers found that blocking CHD7 expression or its activity in frog embryos interfered with the ability of the neural crest cells to migrate during development. This gave us confidence that we were on the right track, said Wysocka. Its apparent that CHD7 is required for the reprogramming and migration of the neural crest cells, which is when one would predict major changes in chromatin organisation would be taking place. Further research showed that CHD7 works with another protein called PBAF to bind areas of DNA associated with, but far from, genes involved in neural crest cell specialisation and migration. Interestingly, CHD7 duplications have been recently associated with small-cell lung cancer, one of the most highly metastatic and aggressive types of cancer. — full story– 15 July 2009An international team of scientists has sequenced the genome of Schistosoma mansoni, a parasitic worm, commonly known as a blood fluke, that infects 210 million in 76 countries through. — full story– 15 July 2009An international team of scientists has sequenced the genome of Schistosoma mansoni, a parasitic worm, commonly known as a blood fluke, that infects 210 million in 76 countries through….Read the Full Story

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