Fertility of xanthin dehydrogenase deficiency mutation og oil silkworm, ogt oil silkworm and oq oil silkworm of silkworm and recovery modulo of phenotype and application null of its

摘要

PROBLEM TO BE SOLVED: To recover the fertility and the expression type of a xanthine dehydrogenase deficient mutant og, etc., of silkworm to effect the recovery of the transparency of the skin and the infertility of the worm and enable the use of the worm as a host by administering a xanthine dehydrogenase deficient mutant og, etc., of silkworm with xanthine oxidase. SOLUTION: Xanthine dehydrogenase deficient mutants og, ogt and oq of silkworm are administered with xanthine oxidase (the administration dose is preferably 2.5 mg per one silkworm) to recover the fertility and the expression type of the xanthine dehydrogenase deficient mutants og. ogt and oq of silkworm. The xanthine dehydrogenase deficient mutants og, ogt and og of silkworm having recovered fertility and expression type are utilizable as host organisms for the introduction of an exogenous gene.