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Male-specific DNA markers from African catfish (Clarias gariepinus)

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Abstract

We searched for sex-specific DNA sequences in the male and female genomes of African catfish, Clarias gariepinus (Burchell, 1822) by comparative random amplified polymorphic DNA (RAPD) assays performed on pooled DNA samples. Two sex-linked RAPD markers were identified from the male DNA pool and confirmed on individual samples, showing good agreement with phenotypic sex. Both markers were isolated, cloned and characterized. The first marker (CgaY1) was nearly 2.6 kb long, while the length of second one (CgaY2) was 458 bp. Southern blot analysis with a CgaY1 probe showed strong hybridizing fragments only in males and not in females under stringent conditions, indicating the presence of multiple copies of CgaY1 in the male genome. When tested by zoo blot on the genomes of two closely related species from the Clariidae family, CgaY1 hybridized to the DNA of Heterobranchus longifilis and generated a faint male-specific band at low stringency. CgaY2 produced similar hybridization pattern in both sexes of C. gariepinus, C. macrocephalus and H. longifilis. Specific primers were designed to the sequences and the markers were amplified in multiplex PCR reactions together with a control band common to all individuals. This allowed for rapid, molecular sexing of the species on the basis of a simple three band (male) versus one band (female) pattern. According to our knowledge these are the first sex-specific DNA markers isolated from a siluroid fish species.

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Authors and Affiliations

  1. Laboratory of Aquatic Molecular Biology, Agricultural Biotechnology Center, POB 411, Gödöllö, H-2101, Hungary

    Balázs Kovács, Sándor Egedi, Richárd Bártfai & László Orbán

  2. Laboratory of Fish Biotechnology and Reproduction, Institute of Molecular Agrobiology, National University of Singapore, 1 Research Link, The NUS, Singapore, 117 604

    Richárd Bártfai & László Orbán

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  1. Balázs Kovács
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  2. Sándor Egedi
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  3. Richárd Bártfai
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  4. László Orbán
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Kovács, B., Egedi, S., Bártfai, R. et al. Male-specific DNA markers from African catfish (Clarias gariepinus). Genetica 110, 267–276 (2000). https://doi.org/10.1023/A:1012739318941

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