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Old 02-08-2011, 03:00 AM   #1
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Default PubMed: DNA methylation in Repetitive Elements and Alzheimer disease.

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DNA methylation in Repetitive Elements and Alzheimer disease.

Brain Behav Immun. 2011 Feb 2;

Authors: Bollati V, Galimberti D, Pergoli L, Valle ED, Barretta F, Cortini F, Scarpini E, Bertazzi PA, Baccarelli A


Epigenetics is believed to play a role in Alzheimer's disease (AD). DNA methylation, the most investigated epigenetic hallmark, is a reversible mechanism that modifies genome function and chromosomal stability through the addition of methyl groups to cytosine located in CpG dinucleotides to form 5 methylcytosine (5mC). Methylation status of repetitive elements (i.e. Alu, LINE-1 and SAT- ?) is a major contributor of global DNA methylation patterns and has been investigated in relation to a variety of human diseases. However, the role of methylation of repetitive elements in blood of AD patients has never been investigated so far. In the present study, a quantitative bisulfite-PCR pyrosequencing method was used to evaluate methylation of Alu, LINE-1 and SAT- ? sequences in 43 AD patients and 38 healthy donors. In multivariate analysis adjusting for age and gender, LINE-1 was increased in AD patients compared with healthy volunteers (ADs: 83.6 %5mC, Volunteers: 83.1 %5mC, p-value: 0.05). The group with best performances in mini mental state examination (MMSE) showed higher levels of LINE-1 methylation compared to the group with worst performances (MMSE>22: 83.9 %5mC; MMSE
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