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https://hdl.handle.net/2440/57068
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Type: | Journal article |
Title: | Replication asynchrony and differential condensation of X chromosomes in female platypus (Ornithorhynchus anatinus) |
Author: | Ho, K. Deakin, J. Wright, M. Marshall Graves, J. Grutzner, F. |
Citation: | Reproduction Fertility and Development, 2009; 21(8):952-963 |
Publisher: | C S I R O Publishing |
Issue Date: | 2009 |
ISSN: | 1031-3613 1448-5990 |
Statement of Responsibility: | Kristen K. K. Ho, Janine E. Deakin, Megan L. Wright, Jennifer A. Marshall Graves and Frank Grützner |
Abstract: | A common theme in the evolution of sex chromosomes is the massive loss of genes on the sex-specific chromosome (Y or W), leading to a gene imbalance between males (XY) and females (XX) in a male heterogametic species, or between ZZ and ZW in a female heterogametic species. Different mechanisms have evolved to compensate for this difference in dosage of X-borne genes between sexes. In therian mammals, one of the X chromosomes is inactivated, whereas bird dosage compensation is partial and gene-specific. In therian mammals, hallmarks of the inactive X are monoallelic gene expression, late DNA replication and chromatin condensation. Platypuses have five pairs of X chromosomes in females and five X and five Y chromosomes in males. Gene expression analysis suggests a more bird-like partial and gene-specific dosage compensation mechanism. We investigated replication timing and chromosome condensation of three of the five X chromosomes in female platypus. Our data suggest asynchronous replication of X-specific regions on X₁, X₃ and X₅ but show significantly different condensation between homologues for X₃ only, and not for X₁ or X₅. We discuss these results in relation to recent gene expression analysis of X-linked genes, which together give us insights into possible mechanisms of dosage compensation in platypus. |
Keywords: | chromosome condensation dosage compensation gene expression X chromosome inactivation. |
Description: | © CSIRO 2009 |
DOI: | 10.1071/RD09099 |
Grant ID: | http://purl.org/au-research/grants/arc/DP0449984 http://purl.org/au-research/grants/arc/DP0449984 |
Published version: | http://dx.doi.org/10.1071/rd09099 |
Appears in Collections: | Aurora harvest 5 Environment Institute Leaders publications Molecular and Biomedical Science publications |
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