| Decreased expression and the Lys751Gln polymorphism of the XPD gene are associated with extreme longevity. | |
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MedLine Citation:
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PMID: 19707883 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Aging is associated with progressing genomic instability. The XPD gene encodes a DNA helicase involved in nucleotide excision repair and in transcription. We analyzed the common XPD polymorphisms that were previously shown to affect protein's DNA repair efficiency and to increase the risk of developing various cancers. Analysis was performed in 149 centenarians (mean age 101.1 years old) and in 413 young subjects (mean age 27.1 years old). We showed that the distribution of the Lys751Gln genotypes differed significantly between these groups (P = 0.017). In centenarians, the homozygous genotypes AA and CC were found less frequently than in young controls (29 vs. 36%, OR = 0.71, and 14 vs. 20%, OR = 0.652, respectively). The Arg156Arg and Asp312Asn were not significantly associated with extreme longevity. Analysis of the XPD mRNA level in blood mononuclear cells of people divided into three age groups (mean ages 28.7, 65.8 and 92.7 years old) showed that extreme longevity is associated with the decrease of the mean level of the specific mRNA; the differences between young or middle-aged vs. extremely old group were significant (P < 0.0001, P < 0.0001, respectively). In addition, the methylation pattern of the XPD promoter was analyzed in 30 people divided into three age groups (29.5, 65.9, and 101.4 years old). We showed that overall methylation of the XPD promoter is a rare event; however, aging is associated with the increase of methylation level upstream of the transcription start site. In summary, we showed for the first time that both the XPD polymorphic variants and the decreased level of its expression might be associated with aging. |
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Authors:
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Jacek Polosak; Malgorzata Roszkowska-Gancarz; Alina Kurylowicz; Magdalena Owczarz; Paulina Dobosz; Malgorzata Mossakowska; Aleksandra Szybinska; Monika Puzianowska-Kuznicka |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2009-08-26 |
Journal Detail:
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Title: Biogerontology Volume: 11 ISSN: 1389-5729 ISO Abbreviation: Biogerontology Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-04-27 Completed Date: 2010-07-29 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100930043 Medline TA: Biogerontology Country: Netherlands |
Other Details:
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Languages: eng Pagination: 287-97 Citation Subset: IM |
Affiliation:
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Department of Biochemistry and Molecular Biology, Medical Center of Postgraduate Education, Warsaw, Poland. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aged Aged, 80 and over Base Sequence DNA Methylation DNA Primers Glycine / genetics* Humans Longevity* Lysine / genetics* Polymorphism, Genetic* Polymorphism, Restriction Fragment Length Promoter Regions, Genetic Xeroderma Pigmentosum Group D Protein / chemistry, genetics* |
| Chemical | |
Reg. No./Substance:
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0/DNA Primers; 56-40-6/Glycine; 56-87-1/Lysine; EC 5.99.-/ERCC2 protein, human; EC 5.99.-/Xeroderma Pigmentosum Group D Protein |
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