Journal
MOLECULAR GENETICS AND GENOMICS
Volume 285, Issue 1, Pages 79-90Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00438-010-0587-7
Keywords
NBS-LRR genes; Evolutionary rate; Tandem and segmental duplication; Soybean
Funding
- National Natural Science Foundation of China [30930008, 30970198, J0730641]
- National Key Project for Gene Transform in China [2009ZX08009-27B]
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It is well known that nucleotide binding site (NBS)-encoding genes are duplicate-rich and fast-evolving genes. However, there is little information on the relative importance of tandem and segmental NBS duplicates and their exact evolutionary rates. The two rounds of large-scale duplication that have occurred in soybean provide a unique opportunity to investigate these issues. Comparison of NBS and non-NBS genes on segments of syntenic homoeologs shows that NBS-encoding genes evolve at least 1.5-fold faster (similar to 1.5-fold higher synonymous and similar to 2.3-fold higher nonsynonymous substitution rates) and lose their genes similar to twofold faster than the flanking non-NBS genes. Compared with segmental duplicates, tandem NBS duplicates are more abundant in soybean, suggesting that tandem duplication is the major driving force in the expansion of NBS genes. Notably, significant sequence exchanges along with significantly positive selection were
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