Origin and timing of the horizontal transfer of a PgiC gene from Poa to Festuca ovina
- 作者：Pernilla Vallenback ; Maarit Jaarola ; Lena Ghatnekar ; Bengt O. Bengtsson
- 关键词：Horizontal gene transfer ; Festuca ovina ; Poa palustris ; Cytosolic phosphoglucose isomerase ; PgiC2
- 刊名：Molecular Phylogenetics and Evolution
- 出版年：2008
- 期刊代码：176_10557903
- 类别：bio
- 出版时间：March 2008
- 卷：46
- 期：3
- 页码：890-896
- 文件大小：280 K
摘要
A segregating second locus, PgiC2, for the enzyme phosphoglucose isomerase (PGIC) is found in the grass sheep’s fescue, Festuca ovina. We have earlier reported that a phylogenetic analysis indicates that PgiC2 has been horizontally transferred from the reproductively separated grass genus Poa. Here we extend our analysis to include intron and exon information on 27 PgiC sequences from 18 species representing five genera, and confirm our earlier finding. The origin of PgiC2 can be traced to a group of closely interrelated, polyploid and partially asexual Poa species. The sequence most similar to PgiC2 is found in Poa palustris with a divergence, based on synonymous substitutions, of only 0.67%. This value suggests that the transfer took place less than 600,000 years ago (late Pleistocene), at a time when most extant Poa and Festuca species already existed.