An estimate of divergence time of parazoa and eumetazoa and that of cephalochordata and vertebrata by aldolase and triose phosphate isomerase clocks

被引:75
作者
Nikoh, N
Iwabe, N
Kuma, K
Ohno, M
Sugiyama, T
Watanabe, Y
Yasui, K
Zhang, SC
Hori, K
Shimura, Y
Miyata, T
机构
[1] NATL INST GENET,MISHIMA,SHIZUOKA 411,JAPAN
[2] OCHANOMIZU UNIV,FAC SCI,DEPT BIOL,BUNKYO KU,TOKYO 112,JAPAN
[3] KAGOSHIMA UNIV,SCH DENT,DEPT ORAL ANAT 1,KAGOSHIMA 890,JAPAN
[4] ACAD SINICA,INST OCEANOL,QINGDAO 266071,PEOPLES R CHINA
[5] SAGA MED SCH,DEPT BIOCHEM,SAGA 84041,JAPAN
[6] BIOMOL ENGN RES INST,SUITA,OSAKA 565,JAPAN
关键词
divergence time; molecular clock; aldolase; triose phosphate isomerase; sponge; amphioxus; evolution;
D O I
10.1007/PL00006208
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Previously we suggested that four proteins including aldolase and triose phosphate isomerase (TPI) evolved with approximately constant rates over long periods covering the whole animal phyla. The constant rates of aldolase and TPI evolution were reexamined based on three different models for estimating evolutionary distances, It was shown that the evolutionary rates remain essentially unchanged in comparisons not only between different classes of vertebrates but also between vertebrates and arthropods and even between animals and plants, irrespective of the models used, Thus these enzymes might be useful molecular clocks for inferring divergence times of animal phyla, To know the divergence time of Parazoa and Eumetazoa and that of Cephalochordata and Vertebrata, the aldolase cDNAs from Ephydatia fluviatilis, a freshwater sponge, and the TPI cDNAs from Ephydatia fluviatilis and Branchiostoma belcheri an amphioxus, have been cloned and sequenced, Comparisons of the deduced amino acid sequences of aldolase and TPI from the freshwater sponge with known sequences revealed that the Parazoa-Eumetazoa split occurred about 940 million years ago (Ma) as determined by the average of two proteins and three models, Similarly, the aldolase and TPI clocks suggest that vertebrates and amphioxus last shared a common ancestor around 700 Ma and they possibly diverged shortly after the divergence of deuterostomes and protostomes.
引用
收藏
页码:97 / 106
页数:10
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