Subtelomeric epigenetic modifications are known to be associated with telomere length. We examined subtelomeric DNA methylation at seven sites for five chromosomes by methylation-specific PCR (MSP) and two sites for two chromosomes by bisulfite genomic sequencing (BGS) in 20 human cancer cell lines and subsequently analyzed their association with telomere length. Full-methylation (55/140) was more frequently found compared to un-methylation (35/140) (p = 0.01). Subtelomeric-methylation patterns varied from region to region; full-methylation and un-methylation were dominant at one of 9q sites (20/20) and 9p (18/20), respectively. MSP and BGS data exhibited no apparent correlation between methylation status and telomere length. In addition, Hep3B subclones that possessed different telomere lengths exhibited no changes in methylation status according to telomeres. In summary, subtelomeres might form distinct chromatin structures from region to region and effect of subtelomeric DNA methylation on telomere regulation might be little.
Bibliographical noteFunding Information:
This work was supported by Korea Science and Engineering Foundation (KOSEF) grants funded by the Korea government (MOST) (R11-2000-082-02008-0), (R11-2000-082-03002-0), and (R11-2000-082-03006-0), and by a grant of the Korea Health 21 R&D Project, Ministry of Health & Welfare, Republic of Korea (0405-BC01-0604-0002), and by the Korea Research Foundation Grant funded by Korean Government (KRF-2008-314-C00253 to B.-K. Oh).
All Science Journal Classification (ASJC) codes
- Cancer Research