Monoallelic gene expression and mammalian evolution

BioEssays : News and Reviews in Molecular, Cellular and Developmental Biology
Barry Keverne

Abstract

Monoallelic gene expression has played a significant role in the evolution of mammals enabling the expansion of a vast repertoire of olfactory receptor types and providing increased sensitivity and diversity. Monoallelic expression of immune receptor genes has also increased diversity for antigen recognition, while the same mechanism that marks a single allele for preferential rearrangement also provides a distinguishing feature for directing hypermutations. Random monoallelic expression of the X chromosome is necessary to balance gene dosage across sexes. In marsupials only the maternal X chromosome is expressed, while in eutherian mammals the paternal X genes are silenced in the developing placenta and early blastocyst. These examples of epigenetic gene regulation commonly employ asynchrony of replication, the binding of polycomb proteins and antisense RNA, and histone modifications to chromatin structure. The same is true for genomic imprinting which among vertebrates is unique to mammals and represents a special kind of epigenetic modification that is heritable according to parent of origin. Genomic imprinting pervades many aspects of mammalian growth and evolution but in particular has played a significant role in the co-a...Continue Reading

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Oct 10, 2013·Neurotherapeutics : the Journal of the American Society for Experimental NeuroTherapeutics·Sampathkumar RangasamyVinodh Narayanan
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Apr 16, 2021·Proceedings of the National Academy of Sciences of the United States of America·Pouya DiniBarry A Ball

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