Comparative genome analysis of the mouse imprinted gene impact and its nonimprinted human homolog IMPACT: toward the structural basis for species-specific imprinting.
Mouse Impact is a paternally expressed gene encoding an evolutionarily conserved protein of unknown function. Here we identified IMPACT, the human homolog of Impact, on chromosome 18q11. 2-12.1, a region syntenic to the mouse Impact locus. IMPACT was expressed biallelically in brain and in various tissues from two informative fetuses and in peripheral blood from an informative adult. To reveal the structural basis for the difference in allelic expression between the two species, we elucidated complete genome sequences for both mouse Impact ( approximately 38 kb) and human IMPACT ( approximately 30 kb). Sequence comparison revealed that the two genes share a well-conserved exon-intron organization but bear significantly different CpG islands. The mouse island lies in the first intron and contains characteristic tandem repeats. Furthermore, this island serves as a differentially methylated region (DMR) consisting of a hypermethylated maternal allele and an unmethylated paternal allele. Intriguingly, this intronic island is missing from the nonimprinted human IMPACT, whose sole CpG island spans the first exon, lacks any apparent repeats, and escapes methylation on both chromosomes. These results suggest that the intronic DMR plays a role in the imprinting of Impact.
Okamura
K
K
Human Genome Center, Institute of Medical Science, University of Tokyo, Tokyo 108-8639, Japan.
Hagiwara-Takeuchi
Y
Y
Li
T
T
Vu
T H
TH
Hirai
M
M
Hattori
M
M
Sakaki
Y
Y
Hoffman
A R
AR
Ito
T
T
D000483:Alleles; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002874:Chromosome Mapping; D002887:Chromosomes, Human, Pair 18 / Q000235:genetics; D018899:CpG Islands / Q000235:genetics; D019175:DNA Methylation; D018076:DNA, Complementary / Q000302:isolation & purification; D018392:Genomic Imprinting / Q000235:genetics*; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins; D051379:Mice; D008969:Molecular Sequence Data; D009928:Organ Specificity / Q000235:genetics; D014176:Protein Biosynthesis; D011506:Proteins / Q000235:genetics*; D012333:RNA, Messenger / Q000032:analysis / Q000378:metabolism; D012689:Sequence Homology, Nucleic Acid; D013045:Species Specificity
D018076:DNA, Complementary; C484600:IMPACT protein, human; C107747:Impact protein, mouse; D047908:Intracellular Signaling Peptides and Proteins; D011506:Proteins; D012333:RNA, Messenger