Kinesin-related genes from diplomonad, sponge, amphioxus, and cyclostomes: divergence pattern of kinesin family and evolution of giardial membrane-bounded organella.

Abstract:

:To understand the question of whether divergence of eukaryotic genes by gene duplications and domain shufflings proceeded gradually or intermittently during evolution, we have cloned and sequenced Giardia lamblia cDNAs encoding kinesins and kinesin-related proteins and have obtained 13 kinesin-related cDNAs, some of which are likely homologs of vertebrate kinesins involved in vesicle transfer to ER, Golgi, and plasma membrane. A phylogenetic tree of the kinesin family revealed that most gene duplications that gave rise to different kinesin subfamilies with distinct functions have been completed before the earliest divergence of extant eukaryotes. This suggests that the complex endomembrane system has arisen very early in eukaryotic evolution, and the diminutive ER and Golgi apparatus recognized in the giardial cells, together with the absence of mitochondria, might be characters acquired secondarily during the evolution of parasitism. To understand the divergence pattern of the kinesin family in the lineage leading to vertebrates, seven more Unc104-related cDNAs have been cloned from sponge, amphioxus, hagfish, and lamprey. The divergence pattern of the animal Unc104/KIF1 subfamily is characterized by two active periods in gene duplication interrupted by a considerably long period of silence, instead of proceeding gradually: animals underwent extensive gene duplications before the parazoan-eumetazoan split. In the early evolution of vertebrates around the cyclostome-gnathostome split, further gene duplications occurred, by which a variety of genes with similar structures over the entire regions were generated. This pattern of divergence is similar to those of animal genes involved in cell-cell communication and developmental control.

journal_name

Mol Biol Evol

authors

Iwabe N,Miyata T

doi

10.1093/oxfordjournals.molbev.a004215

subject

Has Abstract

pub_date

2002-09-01 00:00:00

pages

1524-33

issue

9

eissn

0737-4038

issn

1537-1719

journal_volume

19

pub_type

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