Abstract
The process of sex differentiation in fishes is regulated by genetic and environmental factors. The sex of Patagonian pejerrey (Odontesthes hatcheri) appears to be under strong genotypic control (GSD) because the sex ratios are balanced (1:1) between 17°C and 23°C. However, sex ratios become female-biased at <15°C and male-biased at 25°C, which shows that this species also possesses some degree of temperature-dependent sex determination (TSD). Identification of the genetic sex of an individual will help elucidate the molecular basis of sex differentiation in this species. In this study, we used amplified fragment length polymorphism (AFLP) analysis to develop a genetic linkage map for both sexes and a sex-linked DNA marker for Patagonian pejerrey. The AFLP analysis of 23 male and 23 female progeny via 64 primer combinations produced a total of 153 bands. The genetic linkage map consisted of 79 markers in 20 linkage groups and 48 markers in 15 linkage groups for males and females, respectively. One AFLP marker tightly linked to the sex-determining locus was identified: the marker, ACG/CAA-217, amplified to the male-specific DNA fragment. Sequence analysis of this region revealed a single nucleotide polymorphism (SNP) between males and females, which was converted into a SNP marker. This marker provides genetic confirmation that the sex of Patagonian pejerrey is determined genetically and would be useful for the analysis of the molecular basis of GSD and TSD in this species.
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Acknowledgments
We would like to thank the Inland Water Experimental Station, Kanagawa Prefecture Fisheries Research Center and the Nakayama Town Industrial Development Section, Ehime Prefecture for donation of broodstock fish and L.S. Ito, A. Kitahara, and R.S. Hattori for technical assistance during rearing experiments. This work was supported in part by grants-in-aid from the Ministry of Education, Culture, Sports, Science and Technology of Japan (#12460085 and #15201003) to CAS.
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Koshimizu, E., Strüssmann, C.A., Okamoto, N. et al. Construction of a Genetic Map and Development of DNA Markers Linked to the Sex-Determining Locus in the Patagonian Pejerrey (Odontesthes hatcheri). Mar Biotechnol 12, 8–13 (2010). https://doi.org/10.1007/s10126-009-9194-1
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DOI: https://doi.org/10.1007/s10126-009-9194-1