Methylation of CpG sites in BCL2 major breakpoint region and the increase of BCL2/JH translocation with aging.
The BCL2 breakage mechanism has been shown to be highly dependent on DNA methylation at the major breakpoint region (MBR) CpG sites. We recently described an increased frequency of BCL2/ JH translocation with aging. It is known that methylation levels change with aging. The present study aimed to determine whether methylation alterations at CpG sites of BCL2 MBR were the cause of increased breakages with aging. We analyzed the methylation levels of three CpG sites on the region by pyrosequencing and studied if methylation levels and/or polymorphisms affecting CpG sites were associated with an increase of translocations. We observed that although the methylation levels of MBR CpG sites were higher in individuals with BCL2/JH translocation, in contrast to our expectations, these levels decreased with the age. Moreover, we show that polymorphisms at those CpG sites leading to absence of methylation seem to be a protective factor for the apparition of translocations.
Department of Genetics, Physical Anthropology and Animal Physiology, Faculty of Medicine and Odontology, University of the Basque Country UPV/EHU, Barrio Sarriena sn, 48940, Leioa, Bizkaia, Spain.
Idoia
I
Martin-Guerrero
Elena
E
de Prado
Maite
M
Ardanaz
Maialen
M
Martin-Arruti
Cristina
C
Garcia-Orad
Isabel
I
Guerra
Irune
I
Ruiz
Iñaki
I
Zabalza
Africa
A
Garcia-Orad
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000235:genetics* / Q000378:metabolism; D002648:Child; D002675:Child, Preschool; D018899:CpG Islands / Q000235:genetics*; D019175:DNA Methylation; D005260:Female; D005787:Gene Frequency; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000235:genetics* / Q000378:metabolism; D012016:Reference Values; D012189:Retrospective Studies; D014178:Translocation, Genetic; D055815:Young Adult
C000595707:BCL2 protein, human; D019253:Proto-Oncogene Proteins c-bcl-2