Establishment of the primary imprint of the HYMAI/PLAGL1 imprint control region during oogenesis.
Imprinting within domains occurs through epigenetic alterations to imprinting centers (ICs) that result in the establishment of parental-specific differences in gene expression. One candidate IC lies within the imprinted domain on human chromosome region 6q24. This domain contains two paternally expressed genes, the zinc finger protein gene PLAGL1 (ZAC/LOT1) and an untranslated mRNAcalled HYMAI. The putative IC overlaps exon 1 of HYMAI and is differentially methylated in somatic tissues. In humans, loss of methylation within this region is seen in some patients with transient neonatal diabetes mellitus, and hypermethylation of this region is found in ovarian cancer and is associated with changes in expression of PLAGL1, suggesting that it plays a key role in regulating gene expression. Differential methylation within this region is conserved in the homologous region on mouse chromosome 10A and is present on the maternal allele. In this paper, we report that DNA methylation is established during the growth phase of oogenesis and that this coincides with the establishment of monoallelic expression from this region lending further support to the hypothesis that this region functions as an IC.
Division of Molecular and Cell Therapeutics, Department of Molecular Genetics, Medical Institute of Bioregulation, Kyusyu University, Kyusyu, Japan. tarima@tsurumi.beppu.kyushu-u.ac.jp
T
T
Arima
N
N
Wake
D000818:Animals; D001483:Base Sequence; D017931:DNA Primers; D004268:DNA-Binding Proteins / Q000235:genetics*; D005260:Female; D005786:Gene Expression Regulation; D018392:Genomic Imprinting; D006801:Humans; D008297:Male; D051379:Mice; D009866:Oogenesis / Q000235:genetics*; D062085:RNA, Long Noncoding; D012333:RNA, Messenger / Q000235:genetics*; D022661:RNA, Untranslated / Q000235:genetics; D012727:Sex Characteristics
D017931:DNA Primers; D004268:DNA-Binding Proteins; C094335:H19 long non-coding RNA; C509782:HYMAI, RNA; C104382:PLAG1 protein, human; C491264:Plag1 protein, mouse; D062085:RNA, Long Noncoding; D012333:RNA, Messenger; D022661:RNA, Untranslated