Differential methylation persists at the mouse Rasgrf1 DMR in tissues displaying monoallelic and biallelic expression.
A subset of mammalian genes exhibits genomic imprinting, whereby one parental allele is preferentially expressed. Differential DNA methylation at imprinted loci serves both to mark the parental origin of the alleles and to regulate their expression. In mouse, the imprinted gene Rasgrf1 is associated with a paternally methylated imprinting control region which functions as an enhancer blocker in its unmethylated state. Because Rasgrf1 is imprinted in a tissue-specific manner, we investigated the methylation pattern in monoallelic and biallelic tissues to determine if methylation of this region is required for both imprinted and non-imprinted expression. Our analysis indicates that DNA methylation is restricted to the paternal allele in both monoallelic and biallelic tissues of somatic and extraembryonic lineages. Therefore, methylation serves to mark the paternal Rasgrf1 allele throughout development, but additional factors are required for appropriate tissue-specific regulation of expression at this locus.
Dockery
Lauren
L
Department of Biology, Bryn Mawr College, Bryn Mawr, PA 19010-2899, USA.
Gerfen
Jennifer
J
Harview
Christina
C
Rahn-Lee
Charlotte
C
Horton
Rachel
R
Park
Yaena
Y
Davis
Tamara L
TL
D000483:Alleles; D000818:Animals; D018899:CpG Islands / Q000235:genetics; D019175:DNA Methylation; D004622:Embryo, Mammalian / Q000378:metabolism; D005260:Female; D018392:Genomic Imprinting; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D010920:Placenta / Q000378:metabolism; D013094:Spermatozoa / Q000378:metabolism; D024363:Transcription Initiation Site; D014158:Transcription, Genetic; D020666:ras-GRF1 / Q000235:genetics* / Q000378:metabolism
C513037:Rasgrf1 protein, mouse; D020666:ras-GRF1