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

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	An estimate of divergence time of parazoa and eumetazoa and that of cephalochordata and vertebrata by aldolase and triose phosphate isomerase clocks
	Nikoh, N; Iwabe, N; Kuma, K; Ohno, M; Sugiyama, T; Watanabe, Y; Yasui, K; Zhang, SC; Hori, K; Shimura, Y; Miyata, T
	1997
发表期刊	JOURNAL OF MOLECULAR EVOLUTION
ISSN	0022-2844
卷号	45 期号:1 页码:97-106
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.
关键词	Amino-acid-sequence Drosophila-melanogaster Giardia-lamblia Early Evolution Messenger-rna 3 Isozymes Dna Metazoa Gene Transcripts
学科领域	Biochemistry & Molecular Biology ; Evolutionary Biology ; Genetics & Heredity
收录类别	sci
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/3378
专题	实验海洋生物学重点实验室
推荐引用方式 GB/T 7714	Nikoh, N,Iwabe, N,Kuma, K,et al. An estimate of divergence time of parazoa and eumetazoa and that of cephalochordata and vertebrata by aldolase and triose phosphate isomerase clocks[J]. JOURNAL OF MOLECULAR EVOLUTION,1997,45(1):97-106.
APA	Nikoh, N.,Iwabe, N.,Kuma, K.,Ohno, M.,Sugiyama, T.,...&Miyata, T.(1997).An estimate of divergence time of parazoa and eumetazoa and that of cephalochordata and vertebrata by aldolase and triose phosphate isomerase clocks.JOURNAL OF MOLECULAR EVOLUTION,45(1),97-106.
MLA	Nikoh, N,et al."An estimate of divergence time of parazoa and eumetazoa and that of cephalochordata and vertebrata by aldolase and triose phosphate isomerase clocks".JOURNAL OF MOLECULAR EVOLUTION 45.1(1997):97-106.

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