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Genetic mapping of RAPD markers linked to the densonucleosis refractoriness gene, nsd-1, in the silkworm, Bombyx mori



Genetic mapping of RAPD markers linked to the densonucleosis refractoriness gene, nsd-1, in the silkworm, Bombyx mori



Genes and Genetic Systems 73(4): 237-242



In the silkworm, Bombyx mori, nonsusceptibility to B. mori densonucleosis virus type-1 (BmDNV-1) is controlled by a recessive gene, nsd-1 (nonsusceptibility to DNV-1), located on the twenty-first chromosome. We investigated genetic linkage between five random amplified polymorphic DNA (RAPD) markers and the +nsd-1 gene. Initially, we constructed the CSD-1 strain (nsd-1/+) which is congenic to strain C137 (nsd-1/nsd-1) for the twenty-first chromosome, starting with a female of C137 and a male of strain J137 (+nsd-1/+nsd-1). For the crossing over experiment, a female of C137 was crossed with a male (nsd-1/+) of CSD-1. Segregation analysis showed that the most closely linked RAPD marker mapped 3.0 cM distant from +nsd-1. A more specific marker for +nsd-1 was made by converting this RAPD band into a sequence characterized amplified region (SCAR) using a series of newly designed primer pairs based on its DNA sequence.

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Accession: 046164580

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PMID: 9880921


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