Random amplified polymorphic DNA (RAPD) analysis has been used widely in plant and fungi for identification of markers linked to genetic traits and mapping, but its use is limited to identification of intra- and inter-species difference in domestic mammals. We report here identification of a RAPD-derived marker linked to progressive rod-cone degeneration (prcd), an inherited autosomal recessive retinal disease of dogs. A total of 400 standard 10-mer primers were used for amplification by use of DNA samples from normal (+/+) and affected (prcd/prcd) dogs. A single primer was identified which amplified a 1.5-kb DNA fragment only from normal dogs. PCR with longer primers designed from the sequence-characterized amplified region of the 1.5-kb DNA fragment identified a co-dominant multi-allelic polymorphism in the prcd-informative pedigree. Three recombinants were identified among 34 informative offsprings, yielding a LOD score of 5.568 at θ= 0.091. This marker was mapped to two canine–rodent hybrid cell lines in which two genes (canine homologues of human breast cancer 1 susceptibility gene, and cGMP phosphodiesterase γ-subunit gene), and three anonymous microsatellites have been identified. This is the first reported identification of a RAPD-derived marker with multiple alleles linked to a mammalian disease locus.
Mammalian Genome – Springer Journals
Published: Sep 1, 1998
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