ZHANG Shoukang, ZHENG Jiao, ZHANG Jing, WANG Zhiyong, WANG Yilei, CAI Mingyi. Cytogenetic characterization and description of an X1X1X2X2/X1X2Y sex chromosome system in Collichthys lucidus (Richardson, 1844)[J]. Acta Oceanologica Sinica, 2018, 37(4): 34-39. doi: 10.1007/s13131-018-1152-1
Citation: ZHANG Shoukang, ZHENG Jiao, ZHANG Jing, WANG Zhiyong, WANG Yilei, CAI Mingyi. Cytogenetic characterization and description of an X1X1X2X2/X1X2Y sex chromosome system in Collichthys lucidus (Richardson, 1844)[J]. Acta Oceanologica Sinica, 2018, 37(4): 34-39. doi: 10.1007/s13131-018-1152-1

Cytogenetic characterization and description of an X1X1X2X2/X1X2Y sex chromosome system in Collichthys lucidus (Richardson, 1844)

doi: 10.1007/s13131-018-1152-1
  • Received Date: 2017-03-02
  • The chromosomes of spinyhead croaker Collichthys lucidus (Richardson, 1844) were characterized for the first time by fluorescence staining, self genomic in situ hybridization (self-GISH), and multicolor fluorescence in situ hybridization (FISH) with 18S rDNA, 5S rDNA and telomeric sequence probes. The female karyotype has exclusively 24 pairs of acrocentric chromosomes (2n=48a, NF=48), while the male one consists of 22 pairs of acrocentric chromosomes, 2 monosomic acrocentric chromosomes and a metacentric chromosome (2n=1m+46a, NF=48). The difference between female and male karyotypes indicates the presence of a sex chromosome of X1X1X2X2/X1X2Y type, where Y is the unique metacentric chromosome in the male karyotype. As revealed by FISH, 5S rDNA and 18S rDNA sites were mapped at syntenic position of the largest acrocentric chromosome (X1), and the short arms of the Y chromosome as well. An X1-chromosome specific interstitial telomeric signal (ITS) was detected overlapping the 5S rDNA sites. In addition, self-GISH revealed that the repetitive DNAs accumulated on all the putative sex chromosome. Chromosome fusion accompanied by a partial deletion in the ancestral karyotype (2n=48a) is hypothesized for the origin of such multiple sex chromosome system. The present study, as the first description of differentiated sex chromosome in family Sciaenidae, will give clues to the studies on the sex chromosome of other Sciaenids.
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