Abstract
Nucleolar dominance is an enigma. The puzzle of differential amphiplasty has remained unresolved since it was first recognised and described in Crepis hybrids by Navashin in 1934. Here we review the body of knowledge that has grown out of the many models that have tried to find the genetic basis for differential rRNA gene expression in hybrids, and present a new interpretation. We propose and discuss a chromatin imprinting model which re-interprets differential amphiplasty in terms of two genomes of differing size occupying a common space within the nucleus, and with heterochromatin as a key player in the scenario. Difference in size between two parental genomes induces an inherited epigenetic mark in the hybrid that allows patterns of chromatin organization to have positional effects on the neighbouring domains. This chromatin imprinting model can be also used to explain complex genomic interactions which transcend
Current Genomics
Title:Nucleolar Dominance: A David and Goliath Chromatin Imprinting Process
Volume: 3 Issue: 6
Author(s): W. Viegas, N. Neves, M. Silva, A. Caperta and L. Morais-Cecilio
Affiliation:
Abstract: Nucleolar dominance is an enigma. The puzzle of differential amphiplasty has remained unresolved since it was first recognised and described in Crepis hybrids by Navashin in 1934. Here we review the body of knowledge that has grown out of the many models that have tried to find the genetic basis for differential rRNA gene expression in hybrids, and present a new interpretation. We propose and discuss a chromatin imprinting model which re-interprets differential amphiplasty in terms of two genomes of differing size occupying a common space within the nucleus, and with heterochromatin as a key player in the scenario. Difference in size between two parental genomes induces an inherited epigenetic mark in the hybrid that allows patterns of chromatin organization to have positional effects on the neighbouring domains. This chromatin imprinting model can be also used to explain complex genomic interactions which transcend
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Viegas W., Neves N., Silva M., Caperta A. and Morais-Cecilio L., Nucleolar Dominance: A David and Goliath Chromatin Imprinting Process , Current Genomics 2002; 3 (6) . https://dx.doi.org/10.2174/1389202023350237
DOI https://dx.doi.org/10.2174/1389202023350237 |
Print ISSN 1389-2029 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-5488 |
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