Term Information

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Accession
GO:0060818
Name
inactivation of paternal X chromosome by genomic imprinting
Ontology
biological_process
Synonyms
iXCI, inactivation of paternal X chromosome by genetic imprinting
Alternate IDs
None
Definition
Compensating for the two-fold variation in X-chromosome:autosome ratios between sexes by a global inactivation of all, or most of, the genes on the paternal X-chromosome in the XX sex by genomic imprinting. Source: GOC:dph, GOC:tb, PMID:16789828, PMID:11743158, PMID:23578369, GOC:sdb_2009, PMID:18425126
Comment
Imprinting controlled inactivation of the paternal X chromosome appears to be the ancestral form of sex chromosome inactivation in therian mammals. In eutherian mammals, imprinted X inactivation (iXCI) has largely been replaced by random X inactivation in a process regulated by the Xist and additional ncRNA's encoded within the "choice" region of the X chromosome. In a few mammals with early zygotic genome activation, imprinted X inactivation of the paternal X chromsome occurs very early during embryonic development. Imprinted iXCI has been observed in mice, rats, and bovines, and is best studied in mice where it occurs in the 4 cell stage in mice. In epiblast cells which will become the embryo proper, the inactivated paternal X chromosome is reactivated and dosage compensation of the X chromosome is regenerated by random X inactivation in embryonic tissues. In extraembryonic tissues, the selective inactivation of the paternal chromosome remains and is essential for proper development of the placenta. Selective inactivation of the paternal X chromosome via imprinting is the only form of X chromosome inactivation in marsupials, though the mechanism there may be significantly different in marsupials as the Xist transcript is not present on metatherian X chromosomes.
History
See term history for GO:0060818 at QuickGO
Chem. react.
None
Subset
None
Include "regulates"
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Parents of inactivation of paternal X chromosome by genomic imprinting (GO:0060818)
subject[Reorder by subject] relation[Reorder by relation] object[Reorder by object]
inactivation of paternal X chromosome by genomic imprinting [is_a relation] is_a  dosage compensation by inactivation of X chromosome (GO:0009048)
inactivation of paternal X chromosome by genomic imprinting [is_a relation] is_a  genomic imprinting (GO:0071514)

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