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Temporal control of DNA replication and the adaptive value of chromatin diminution in copepods

✍ Scribed by Wyngaard, Grace A. ;Gregory, T. Ryan

Publisher: John Wiley and Sons
Year: 2001
Tongue: English
Weight: 124 KB
Volume: 291
Category: Article
ISSN: 0022-104X
DOI: 10.1002/jez.1131

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✦ Synopsis

Abstract

Chromatin diminution is a precisely controlled, highly repeatable, genome‐wide deletion of noncoding heterochromatic segments from the presomatic line. The somatic line is reduced in size and reorganized; the germ line remains unaltered. Little is understood about its mechanistic underpinnings and adaptive significance in the nematodes, copepods, and hagfish in which it occurs. Here, we propose that microcrustacean copepods, whose cytology, development, and evolutionary ecology are well understood from an adaptationist point of view, provide the vehicle to test how chromatin diminution might orchestrate certain cell cycle dynamics, with the consequence of influencing the evolution of nuclear DNA contents, organismal development rates, and body size. J. Exp. Zool. (Mol. Dev. Evol.) 291:310–316, 2001. © 2001 Wiley‐Liss, Inc.

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