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GrainGenes Reference Report: GNM-45-946

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Reference	GNM-45-946
Title	Genus-specific localization of the TaiI family of tandem-repetitive sequences in either the centromeric or subtelomeric regions in Triticeae species (Poaceae) and its evolution in wheat
Journal	Genome
Year	2002
Volume	45
Pages	946-955
Author	Kishii M Tsujimoto H
Abstract	Summary: The Tail family sequences are classified as tandem repetitive DNA sequences present in the genome of tribe Triticeae, and are localized in the centromeric regions of common wheat, but in the subtelomeric heterochromatic regions of Leymus racemosus and related species. In this study, we investigated the chromosomal distribution of TaiI family sequences in other Triticeae species. The results demonstrated a centromeric localization in genera Triticum and Aegilops and subtelomeric localization in other genera, thus showing a genus-dependent localization of TaiI family sequences in one or the other region. The copy numbers of TaiI family sequences in species in the same genus varied greatly, whether in the centromeric or subtelomeric regions (depending on genus). We also examined the evolution of TaiI family sequences during polyploidization of hexaploid common wheat. A comparison of chromosomal locations of the major TaiI family signals in common wheat and in its ancestral species suggested that the centromeric TaiI family sequences in common wheat were inherited from its ancestors with little modification, whereas a mixed origin for the B genome of common wheat was indicated
External Databases	Pubmed: 12416628
Keyword	[ Hide all but 1 of 29 ] aegilops afa-family arabidopsis thaliana canada centromere chromosomal location chromosome common wheat dna dna sequence evolution family genome genome differentiation genus hexaploid hexaploid wheat localization organization poaceae repeated dna-sequences repetitive dna rye sequence subtelomere taii family tandem repeat triticeae triticum

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