Transposable Elements May Have Had A Major Role In The Evolution Of Higher Organisms
...elements. Thus, McDonald argues, it is likely that methylation and other relatedsilencing mechanisms also originally evolved as a defense against transposableelements. "By silencing transposable elements, host genes are able to protectthemselves from mutations that actively jumping elements can cause," s......est that the early cancer cell may use reduced DNA methylation todecrease genome stability and increase the mutat...while others have found excess methylation. Excess methylation waslinked to the silencing of tumor suppressor genes, whereas the role ofdiminished DNA methylation ...Scientists suggest genetic shutdown links estrogen, heart disease
...udy, Post says, her team will now look atincreased methylation in the genes of older women as a possible explanat...R genes are methylated. "Age-associated changes in methylation may link aging with colon cancer earlyon," says Post; "And we were looking for the same trend with a...Researchers find high levels of mercury in native ore deposits
... Kerfoot said he doesn't know the extent of methylation in LakeSuperior, but that this aspect is being investigated by scientists under a5-year NOAA/National Science Foundation study grant called KITES (KeweenawInterdisciplinary Transport Experimental Study)....Key developmental genes identified, linked to rare syndrome
...led Dnmt3a and Dnmt3b control the establishment of methylation patterns - a crucial process that controls gene f... in the uterus, a wave of what is called "de novo" methylation takes place, establishing a new, embryonic pattern. As cells in the developing embryo reproduce, ne...Mutations not the only gene defect that leads to cancer
... methylation. Normally, healthy cells use DNA methylation during development and through... needed. In cancer cells, aberrant DNA methylation turns off genes that would normally prevent inappropriate cell division. In ...Hopkins researchers develop method to predict response to chemotherapy
... "We want to caution that testing for MGMT gene methylation in brain tumors is not yet widely available," acco...in cancer also has been well-defined, with similar methylation patterns playing a role in colon cancer, lung cancer, lymphoma, and head and neck cancers. More t...Penn study finds signs folic acid and Vitamin B12 may lessen some ill effects of SMA
...ace. In addition to unraveling the function of the methylation of arginines inproteins -- a common modification process that was first reported more than30 years ago whose function remained unknown until now -- the findings mayhave important implications for neurodegenerative disease. The methyl group tags are s...Science researchers report 'extremely unstable' gene expression in cloned mice
...therefore lowers its expression levels. Degrees of methylation of H19 varied between the clones. Although most of the mice showed increased birth and placental weights, along with the changes in gene expression, the researchers didn't find any significant correlation between any of the specific variations i......f we could understand how and why this type of DNA methylation is occurring, and what enzymes are involved, we mi...ertain proteins from binding. In this way, the DNA methylation could be stopping the cell from operating normally, Teitell said. By silencing cellular genes, this ...Genetic changes leading to colon cancer noted in normal tissue
... cancer and studied their normal colonic cells for methylation of MLH1. They also examined fresh tissue specimen... (MSP-ISH), the scientists analyzed the pattern of methylation throughout 133 of 164 available samples. Of 90 patients whose tumors were MSI(-), 20 percent reveal...... pursued research topic because aberrations in DNA methylation been implicated in the process of aging and the de...protein family, is required for normal genome-wide methylation during development. As Lsh is similar to proteins that are known to alter chromatin, or compact DNA...Hopkins researchers develop potential new screening test for prostate cancer
...ecursors of prostate cancer. High levels of GSTP1 methylation were detected in 63 of 69 (91.3 percent) early-sta...n 15 of 28 PIN lesions (53.6 percent). Some GSTP1 methylation was found in nine of 31 samples (29 percent) of benign disease. To test if GSTP1 methylation could b...Researchers identify gene required for marking DNA as having come from the mother
...lies (ICF) syndrome. The mutations cause a lack of methylation of some DNA sequences that are present in many copies on several chromosomes. In 1991, Dr. Argiris Efstratiadis, Higgins Professor of Genetics & Development, found the first imprinted gene when he showed that transmission of a targeted disruption of...Protein discovery tied to DNA master switch
...rch had linked gene silencing, or deactivation, to methylation of a particular lysine site (lysine 9) on the tail... As it turns out, modifications of amino acids by methylation mainly occur on lysine. "We've known for three decades that histone can be methylated, but nobody kn...Study shows plants inherit traits from more than gene sequence alone
...he group suspects changes in DNA methylation. DNA methylation is a chemical modification of cytosine, one of the... dwarfing in plants to certain death in mice. But methylation is just one type of DNA modification studied in epigenetics. There are several others. The next lev...New light on molecular switch that turns genes off
...ere has linked gene silencing, or deactivation, to methylation of particular lysines on the amino acid tail of th... lysine 36 of the H3 tail. Set2 is responsible for methylation at this site. However, the researchers noted that in doing so "it helps to represses or silence gene...Other highlights in the March 6 issue of JNCI
...roid hormone receptors appear to be inactivated by methylation in prostate cancer tissue and cell lines, a new st...ncisco, and his coworkers compared the presence of methylation of estrogen, androgen, and progesterone receptor genes in cancerous and normal prostate tissue from ...SFVAMC study explains prostate cancer resistance to hormone therapy
...rst showed that normal prostate cells were free of methylation at estrogen receptor genes and the cells displayed plenty of estrogen receptors. However, cells from late-stage prostate cancers had hypermethylation on their estrogen receptor genes and the cells displayed no estrogen receptors. Cells from an earl...Dietary changes can lower colon cancer risk in families with a history of the disease
...em particularly susceptible to deficiencies in the methylation process. This research may make it possible to identify genes that confer a greater risk of the disease in families with a history of it, Fuchs remarks. That would be an important step toward therapies able to reduce that risk. Our findings involvi...