期刊
MOLECULAR CYTOGENETICS
卷 6, 期 -, 页码 -出版社
BMC
DOI: 10.1186/1755-8166-6-12
关键词
Oplegnatidae; X1X2Y sex chromosomes; Fluorescence in situ hybridization; Repetitive DNAs; Chromosomal differentiation
资金
- FAPESP (Fundacao de Amparo a Pesquisa do Estado de Sao Paulo)
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
- National Natural Science Foundation of China [41106114]
- National Science and Technology Pillar Program of China [2011BAD13B08]
- Project of Zhejiang Province of China [2010R50025, 2010 F20006]
Despite the theoretical and experimental progress, our understanding on sex chromosome differentiation is still diagrammatic. The accumulation of repetitive DNA sequences is believed to occur in early stages of such differentiation. As fish species present a wide range of sex chromosome systems they are excellent models to examine the differentiation of these chromosomes. In the present study, the chromosomal distribution of 9 mono-, di- and tri-nucleotide microsatellites were analyzed using fluorescence in situ hybrization (FISH) in rock bream fish (Oplegnathus fasciatus), which is characterized by an X1X2Y sex chromosome system. Generally, the males and females exhibited the same autosomal pattern of distribution for a specific microsatellite probe. The male specific Y chromosome displays a specific amount of distinct microsatellites repeats along both arms. However, the accumulation of these repetitive sequences was not accompanied by a huge heterochromatinization process. The present data provide new insights into the chromosomal constitution of the multiple sex chromosomes and allow further investigations on the true role of the microsatellite repeats in the differentiation process of this sex system.
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