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PMID: 9291956 Published · ppublish English Journal Article Review

Are rice chromosomes components of a holocentric chromosome ancestor?

Plant molecular biology ·Vol. 35 ·No. 1-2 ·1997-09-00 ·Pages 17-23

Moore G, Aragón-Alcaide L, Roberts M, Reader S, Miller T, Foote T

Abstract

Comparative genomics reveals that cereal genomes are composed of similar genomic building blocks (linkage blocks). By stacking these blocks in a unique order, it is possible to construct a single ancestral 'chromosome' which can be cleaved to give the basic structure of the 56 different chromosomes found in wheat, rice, maize, sorghum, millet and sugarcane. The borders of linkage blocks are defined by cereal centromeric and telomeric sites. However, a number of studies have shown that telomeric heterochromatin has neocentromeric activity, implying that linkage blocks are in fact defined by centromeric-like sites with conserved sequences. The structure of the ancestral cereal genome thus resembles a holocentric chromosome, which is the chromosome structure shared by the closest relatives of the Gramineae, the Cypericeae and Juncaceae.

MeSH Terms
Biological Evolution Chromosomes/chemistry Oryza/chemistry,genetics
Authors & Affiliations
6 authors, click to expand affiliations / ORCID
Moore G
Cereals Research Department, John Innes Centre, Norwich Research Park, Colney, UK.
Aragón-Alcaide L
Roberts M
Reader S
Miller T
Foote T
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Article Info
Journal
Plant molecular biology
Abbr.
Plant Mol Biol
ISSN
0167-4412
Published
1997-09-00
Pages
17-23
Language
English
Region
Netherlands
NLM ID
9106343
Subset
IM
External Links
PubMed source View journal details
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