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Autotriploid origin of Carassius auratus as revealed by chromosomal locus analysis.

Authors :
Qin Q
Wang J
Hu M
Huang S
Liu S
Source :
Science China. Life sciences [Sci China Life Sci] 2016 Jun; Vol. 59 (6), pp. 622-6. Date of Electronic Publication: 2016 Apr 15.
Publication Year :
2016

Abstract

In the Dongting water system, the Carassius auratus (Crucian carp) complex is characterized by the coexistence of diploid forms (2n=100, 2nCC) and polyploid forms. Chromosomal and karyotypic analyses have suggested that the polyploid C. auratus has a triploid (3n=150, 3nCC) and a tetraploid origin (4n=200), respectively. However, there is a lack of direct genetic evidence to support this conclusion. In this paper, analysis of the 5S rDNA chromosomal locus revealed that the 3nCC is of triploid origin. Analysis of the species-specific chromosomal centromere locus revealed that 3nCC individuals possess three sets of C. auratus-derived chromosomes. Our results provide direct cytogenetic evidence suggesting that individuals with 150 chromosomes are of autotriploid origin within the C. auratus complex. It marks an important contribution to the study of polyploidization and the evolution of vertebrates.

Details

Language :
English
ISSN :
1869-1889
Volume :
59
Issue :
6
Database :
MEDLINE
Journal :
Science China. Life sciences
Publication Type :
Academic Journal
Accession number :
27084707
Full Text :
https://doi.org/10.1007/s11427-016-5040-7