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Genomic imprinting: Male mice with uniparentally derived sex chromosomes
Author(s) -
Handel Mary Ann,
Hunt Patricia A.
Publication year - 1991
Publication title -
molecular reproduction and development
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.745
H-Index - 105
eISSN - 1098-2795
pISSN - 1040-452X
DOI - 10.1002/mrd.1080280404
Subject(s) - biology , genomic imprinting , imprinting (psychology) , genetics , gene , dna methylation , gene expression
Although it has been known that there is an X‐chromosome imprinting effect during early embryogenesis in female mammals, it remains unknown if parental origin of the X chromosome has an effect in males. Furthermore, it has not been possible to produce animals with normal sex chromosomes of uniparental origin to further evaluate such imprinting effects. We have devised a breeding scheme to produce male mice, designated X P Y P males, in which both the X and Y chromosomes are paternally inherited. To our knowledge, these are the first mammals produced that have a normal sex chromosome constitution but with both sex chromosomes derived from one parent. Development and reproduction in these X P Y P males and the sex ratio and chromosome constitution of their offspring appeared normal; thus there is no apparent effect in males of having both sex chromosomes derive from one parent of of having the X chromosome derived from an inappropriate parent. Although we have detected no X‐chromosome imprinting effect in these males, evidence from other sources suggests that the X chromosome is parentally imprinted. Thus detection and definition of an imprint can depend on the assay used.