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Coupling and decoupling of evolutionary mode between X- and Y-chromosomal red-green opsin genes in owl monkeys

Authors :
Nagao, Kenji
Takenaka, Naomi
Hirai, Momoki
Kawamura, Shoji
Source :
Gene. Jun2005, Vol. 352, p82-91. 10p.
Publication Year :
2005

Abstract

Abstract: We previously discovered Y-chromosomal red-green opsin genes in two types of owl monkeys with different chromosomal characteristics. In one type, the Y-linked opsin gene is a single-copy intact gene and in the other, the genes exist as multiple pseudogenes on a Y/autosome fusion chromosome. In the present study, we first distinguished the two types of monkeys as distinct allopatric species on the basis of karyotypic characteristics: Aotus lemurinus griseimembra (Karyotype III, diploid chromosome number [2n]=53) and Aotus azarae boliviensis (Karyotype VI; male 2n =49; female 2n =50), belonging to the northern and southern species groups, respectively, separated by the Amazon River system. Our sequence analysis revealed a common L1-Alu-Alu insertion between the two species in the 3′-flanking region of the X-linked opsin genes. The insertion was absent in the Y-linked opsin genes and in the human red and green opsin genes, indicating that it occurred in the X copy before the split into northern and southern species and after the X to Y duplication, i.e. duplication preceded speciation. We also show that in the northern species, the Y-linked opsin gene has evolved concomitantly with the X-linked copy whereas in the southern species, the Y-autosome fusion possibly led to decoupling evolutionary processes between X- and Y-linked copies and subsequent degeneration and duplications of the Y-linked opsin gene. [Copyright &y& Elsevier]

Details

Language :
English
ISSN :
03781119
Volume :
352
Database :
Academic Search Index
Journal :
Gene
Publication Type :
Academic Journal
Accession number :
17926747
Full Text :
https://doi.org/10.1016/j.gene.2005.04.008