Polygenic sex determination system in zebra fish meeting








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zebrafish has a polygenic sex determination system. Citation: Liew WC, Bartfai R, Lim Z, Sreenivasan R, Siegfried KR, et al. () Polygenic Sex Determination System in Zebrafish. Background Despite the popularity of zebrafish as a research model, its sex determination (SD) mechanism is still unknown. Most cytogenetic studies failed to find dimorphic sex chromosomes and no primary sex determining switch has been identified even though the assembly of zebrafish genome sequence.

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Background Despite the popularity of zebrafish as a research model, its sex determination (SD) mechanism is still unknown. Most cytogenetic studies failed to find dimorphic sex chromosomes and no primary sex determining switch has been identified even though the assembly of zebrafish genome sequence is near to completion and a high resolution genetic map is available. Perhaps the most widely known genetic sex determination system is the male heterogametic XX/XY system found in most mammals, where the Sry gene on the Y chromosome determines male sex. Thus, XY individuals develop as males, and XX individuals develop as females.

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The authors reported two contributing to the sex determination process might be far more regions on two separate chromosomes (Chr5 and Chr16) than just a handful. accounting for 16% variance of the trait, providing a direct experimental evidence for a polygenic sex determination system in Polygenic sex determination might be more common the.

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() Zebrafish sex determination appears to be genetic. 5th International Symposium on the Biology of Vertebrate Sex Determination, Apr , USA (Poster). Liew WC, Chang A, Ye MS, Yap KC & Orban L. () Using mtSNPs to identify the sex of mouthbrooding parent in Asian arowana (Scleropages formosus).

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Hence, zebrafish, like several other fishes (European sea bass) has a polygenic sex determination (Liew et al. ; Liew and Orbán ). In polygenic sex determination, sex is a result of combinatorial action of multiple alleles on loci that are typically dispersed throughout the genome.

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Thus, zebrafish likely have a complex sex determination system, controlled by a combination of genetic and environmental factors. The first signs of sex differentiation in zebrafish are histological differences in the developing gonads.

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How to Identify Sex in Zebrafish Identifying Males Identifying Females The typical body shape of a male zebrafish is very slender compared to that of the female. Males tend to be much more active than female zebrafish. They also appear to be more gold or yellow in color than females on the ventral side of their body (belly).

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It was also within fish that polygenic sex determination was discovered [17, 18], demonstrating that genetic sex determination need not be monogenic in nature. In polygenic sex determination systems, multiple, independently segregating sex determination alleles interact to determine sex within a species.

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Liew et al. () demonstrated that sex ratio in unselected zebrafish families can range from 5% to 97% male owing to genetic variation between individual broodstock, and therefore it is crucial that genetic variation be controlled in any study examining environmental effects on sex determination in zebrafish.


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Description: The results confirmed the location of the natural sex determination locus, and suggested that zebrafish use a sex determination system similar to that found in birds, in which females are heterogametic (heterozygous at the sex locus) and males homogametic. Gynogenesis is one of the fastest ways to produce highly inbred strains. However, the production of gynogenetic zebrafish lines has some disadvantages (i.e., logistical difficulties related to sperm, high mortality levels of embryos and larvae, biased sex ratio, low quantity and variable quality sperm, etc.). However, in the latest years, several molecular studies support that sex determination of zebrafish has a polygenic basis (PSD) (Anderson et al., , Bradley et al., , Liew et al., , Liew and Orban, ).
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