MBE Advance Access originally published online on February 28, 2007
Molecular Biology and Evolution 2007 24(5):1161-1180; doi:10.1093/molbev/msm036
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© 2007 The Authors.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Research Articles |
Gene Relocations within Chloroplast Genomes of Jasminum and Menodora (Oleaceae) Are Due to Multiple, Overlapping Inversions
* School of Life Sciences and Biotechnology, Korea University, Seoul, Korea
Section of Integrative Biology and Institute of Cellular and Molecular Biology, University of Texas, Austin
E-mail: kimkj{at}korea.ac.kr.
Accepted for publication February 18, 2007.
The chloroplast (cp) DNA sequence of Jasminum nudiflorum (Oleaceae–Jasmineae) is completed and compared with the large single-copy region sequences from 6 related species. The cp genomes of the tribe Jasmineae (Jasminum and Menodora) show several distinctive rearrangements, including inversions, gene duplications, insertions, inverted repeat expansions, and gene and intron losses. The ycf4–psaI region in Jasminum section Primulina was relocated as a result of 2 overlapping inversions of 21,169 and 18,414 bp. The 1st, larger inversion is shared by all members of the Jasmineae indicating that it occurred in the common ancestor of the tribe. Similar rearrangements were also identified in the cp genome of Menodora. In this case, 2 fragments including ycf4 and rps4–trnS–ycf3 genes were moved by 2 additional inversions of 14 and 59 kb that are unique to Menodora. Other rearrangements in the Oleaceae are confined to certain regions of the Jasminum and Menodora cp genomes, including the presence of highly repeated sequences and duplications of coding and noncoding sequences that are inserted into clpP and between rbcL and psaI. These insertions are correlated with the loss of 2 introns in clpP and a serial loss of segments of accD. The loss of the accD gene and clpP introns in both the monocot family Poaceae and the eudicot family Oleaceae are clearly independent evolutionary events. However, their genome organization is surprisingly similar despite the distant relationship of these 2 angiosperm families.
Key Words: chloroplast genome • inversions • gene duplications • insertions • inverted repeat expansions • gene and intron losses • Jasminum • Menodora
Charles Delwiche, Associate Editor
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