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PMID: 17629796 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Rapid evolution and complex structural organization in genomic regions harboring multiple prolamin genes in the polyploid wheat genome.

Plant molecular biology ·Vol. 65 ·No. 1-2 ·2007-09-00 ·Pages 189-203

Gao S, Gu YQ, Wu J, Coleman-Derr D, Huo N, Crossman C, Jia J, Zuo Q, Ren Z, Anderson OD, Kong X

Abstract

Genes encoding wheat prolamins belong to complicated multi-gene families in the wheat genome. To understand the structural complexity of storage protein loci, we sequenced and analyzed orthologous regions containing both gliadin and LMW-glutenin genes from the A and B genomes of a tetraploid wheat species, Triticum turgidum ssp. durum. Despite their physical proximity to one another, the gliadin genes and LMW-glutenin genes are organized quite differently. The gliadin genes are found to be more clustered than the LMW-glutenin genes which are separated from each other by much larger distances. The separation of the LMW-glutenin genes is the result of both the insertion of large blocks of repetitive DNA owing to the rapid amplification of retrotransposons and the presence of genetic loci interspersed between them. Sequence comparisons of the orthologous regions reveal that gene movement could be one of the major factors contributing to the violation of microcolinearity between the homoeologous A and B genomes in wheat. The rapid sequence rearrangements and differential insertion of repetitive DNA has caused the gene islands to be not conserved in compared regions. In addition, we demonstrated that the i-type LMW-glutenin originated from a deletion of 33-bps in the 5' coding region of the m-type gene. Our results show that multiple rounds of segmental duplication of prolamin genes have driven the amplification of the omega-gliadin genes in the region; such segmental duplication could greatly increase the repetitive DNA content in the genome depending on the amount of repetitive DNA present in the original duplicate region.

MeSH Terms
Amino Acid Sequence Base Sequence Evolution, Molecular Gene Deletion Gene Duplication Genes, Plant/genetics Genome, Plant/genetics Gliadin/genetics,metabolism Glutens/chemistry,genetics,metabolism Molecular Sequence Data Molecular Weight Phenylpropanolamine/metabolism Plant Proteins/genetics,metabolism Polyploidy Prolamins Sequence Alignment Time Factors Triticum/genetics,metabolism
Chemicals
Plant Proteins Prolamins Phenylpropanolamine Glutens Gliadin glutenin
Authors & Affiliations
11 authors, click to expand affiliations / ORCID
Gao Shuangcheng
Key Laboratory of Crop Germplasm & Biotechnology, MOA, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, National Key Facility for Crop Gene Resources and Genetic Improvement, Zhongguancun, Beijing, PR China.
Gu Yong Qiang
Wu Jiajie
Coleman-Derr Devin
Huo Naxin
Crossman Curt
Jia Jizeng
Zuo Qi
Ren Zhenglong
Anderson Olin D
Kong Xiuying
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Article Info
Journal
Plant molecular biology
Abbr.
Plant Mol Biol
ISSN
0167-4412
DOI
10.1007/s11103-007-9208-1
Published
2007-09-00
Epub
2007-00-16
Pages
189-203
Language
English
Region
Netherlands
NLM ID
9106343
Subset
IM
External Links
PubMed source DOI: 10.1007/s11103-007-9208-1 View journal details
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