Gene alteration spurs growth of colon cancer
...mechanism called DNA methylation. This type of methylation produces an abnormal off switch that in this case ...of a tumor suppressor protein, said Markowitz. The methylation process has also been implicated in turning off other tumor suppressor genes and is recognized as a ...Other highlights in the May 15 issue of JNCI
...egree of DNA Methylation: Certain patterns of DNA methylation in tumor suppressor genes have been associated wit...ter in Houston, and their coworkers looked at gene methylation within hepatocellular carcinoma tumors from patients in different countries. The degree of methylati...U. Va. scientists find new piece of gene expression puzzle
...ound an unexpected mechanism that dictates whether methylation occurs at the K4 position of H3. It showed that an...l of a completely different histone, H2B, affected methylation of lysine at this K4 position on the H3 tail. This phenomenon, referred to as "trans-tail" regulatio...Scientists discover chromatin-modifying enzyme crucial for normal development
...nce suggests that G9a-mediated histone H3 lysine 9 methylation serves to regulate the expression of crucial genes...nd that one of the genes regulated by G9a-mediated methylation is Mage-2a, which encodes a tumor-specific protein whose function is currently unknown. The research...Research may take the 'anti' out of antioxidants
.... "It's sweet," Hausinger said. "It burns off the methylation and doesn't kill itself in the process. It can work on one lesion and then move on and do it again." Methylation isn't always bad, Hausinger said, but rather is an important natural process that also occurs in human DNA. However, the process is par...New technique widens the lens on cancer, could lead to new therapies
...CSF Comprehensive Cancer Center. "We show that DNA methylation is most often affecting a totally different set of...genes; consequently, genes undermined primarily by methylation have remained hidden. In the current study of human brain tumors, however, researchers determined n...Study helps explain gene silencing in the developing embryo
...stone 3," Zhang said. When enzyme activity causing methylation of this site is blocked, Hox gene silencing does n...ain the permanence of Hox gene silencing. "Histone methylation cannot be reversed. It becomes permanent, a long-term genetic marker. Thus far, no 'histone demethyl...JCI table of contents, January 15 2003
...ion. Having previously shown that inhibition ofDNA methylation increases IGF2 transcription from one of its promo...ntary to the human IGF2 P4 promoter inducedde novo methylation in the P4 region. Moreover, IV injection of the oligoprolonged survival of mice implanted with human...Gene loss creates age- and gender-dependent cancer syndrome in mice
...d, but Hic1 was identified solely because of extra methylation in cancer cells," says Stephen Baylin, Ph.D., prof...of epigenetic problems, Baylin says. Since excess methylation turns the gene off, former graduate student Mark Carter and the team tried to measure its impact on ...Backstage with a command performer
...ication processes -- acetylation, phosphorylation, methylation and ubiquitination -- was not well understood. The...l mass spectroscopy analysis is that Ezh2 controls methylation of histone H3 on one particular lysine residue, or biochemical modification site, on what is known a...Potential blood test for colon cancer risk
...ss and potentially prevent cancer. Imprinting and methylation are two elements of a larger field of research called epigenetics, which refers to changes to genes other than in the DNA sequence itself. Since epigenetic influences tend to change over time, Feinberg plans to study a larger group of patients and fo...JCI Table of Contents, March 14, 2003
...ancersyndromes, and somatic mutations and promoter methylation of these geneshave been found in a variety of huma...t expression ofeither hMLH1 or hMSH2, and promoter methylation seemed to be the predominantcause. Moreover, promoter methylation of hMLH1 (whose expression is lost...Process triggered by some anti-cancer drugs causes tumors in mice, study finds
...mes to become unstable by affecting changes in the methylation of the DNA, which renders a gene active or inactiv...tions in genes that normally suppress tumors; when methylation was reduced in such mice, Eden found that they developed soft-tissue sarcomas earlier when compared ...Gene mutation in some uterine tumors may signal that cancer runs in family
...SH2. Ninety-two showed a molecular change known as methylation in the MLH1 and five had mutations in MSH2. Of the remaining 30 tumors with high MSI and normal MLH1 and MSH2 genes, 11 showed mutations in MSH6. In addition, seven of these women showed MSH6 mutations in healthy body cells white blood cells indica...First evidence that genetic imprinting occurs at earliest stage in test tube-matured eggs
...face of adult mouse ovaries. They then studied the methylation status of the three genes in the immature in-vitro...nd Igf2R alleles were almost all methylated. These methylation profiles are characteristic of the maternal imprint and provided evidence that maternal methylation ...Researchers identify protein modules that 'read' distinct gene 'silencing codes'
...opment paper focuses on a chemical reaction called methylation that occurs on histone H3 (histones are made of fo... visualize how the HP1 chromodomain recognizes the methylation mark on Lys9. In the Genes & Development paper, Allis and Khorasanizadeh describe how another silen...Common nutrients fed to pregnant mice altered their offspring's coat color
...udy. "The implications for humans are huge because methylation is a common event in the human genome, and it is c...tially that of other genes, as well. Moreover, the methylation occurred early during gestation, as evidenced by its widespread manifestation throughout cells in th...UNC researchers identify protein crucial to gene silencing
...irst time a protein that directly regulates lysine methylation on the core histone protein, H3, in a way that rep...TDB1. However, subsequent studies showed that such methylation might not be enough by itself to trigger gene silencing. The newly discovered murine regulatory prot...Chemical change may help predict seriousness and course of some cancer
... Institute examined how a chemical change known as methylation spreads from one region of a breast-cancer gene to...atients. The findings provide insight into how the methylation process progresses until it inactivates genes such as tumor suppressor genes that otherwise help pro......s studies of PHP-Ib cases have described a loss of methylation at the maternal GNAS exon A/B, suggesting that PHP...f GNAS exon A/B that results in a loss of exon A/B methylation and propose that it is this genetic defect that underlies renal PTH resistance in PHP-Ib. TITLE: ...