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GrainGenes Reference Report: GNM-45-956

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Reference	GNM-45-956
Title	Molecular analysis of the complete set of length mutations found in the plastomes of Triticum-Aegilops species
Journal	Genome
Year	2002
Volume	45
Pages	956-962
Author	Ogihara Y Ohsawa T
Abstract	Summary: Precise location and nature of each of 14 length mutations detected among chloroplast DNAs of Triticum-Aegilops species by RFLP analysis were determined at the nucleotide sequence level. Each mutation was compared with at least three non-mutated wild-type plastomes as standards. These 14 length mutations were classified into 4 duplications and 10 deletions. One duplication occurred in the small single-copy region close to the border of the inverted repeat, and the remaining 13 length mutations took place in the large single-copy region. All length mutations occurred in the intergenic regions, suggesting that these length mutations do not affect plastid gene expression. Saltatory replication was the cause of all duplications, whereas intramolecular recombination mediated by short direct repeats played a substantial role in the deletions. Recurrent occurrences of certain deletion events were found in some AT-rich regions, which constituted hot spots for deletion. Out of four hypervariable regions detected among the grass plastomes, two (downstream of rbcL and a tRNA gene accumulated region) were still active after differentiation of Triticum and Aegilops complex
External Databases	Pubmed: 12416629
Keyword	[ Hide all but 1 of 31 ] aegilops canada chloroplast dna complete nucleotide-sequence deletion deletion hot spots differentiation direct-repeat sequences divergence dna duplication gene gene expression gene organization genome hot-spot region hot-spots insertions-deletions molecular mechanism mutation nucleotide sequence oryza sativa plastome rbcl recombination rflp rflp analysis sequence triticum triticum aegilops wheat chloroplast dnas

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