Sequence polymorphisms around the 5'-end of the silkworm fibroin H-chain gene suggesting the occurrence of crossing-over between heteromorphic alleles.
Nucleotide sequences around the 5'-ends of the silkworm fibroin H-chain genes of the three strains, Nd(2), J-139, and F1(Gunka X Hoshun), of Bombyx mori were determined. Comparison of the sequences among these strains and the sequences reported previously for the two other strains, F1(Gunpo X Shugyoku) and Daizo, indicates that polymorphisms are present in the 5'-flanking and intron regions and that each region has at least two sequence variants independent of each other. These results suggest that crossing over between the heteromorphic H-chain alleles has occurred during the breeding of these strains.
D000483:Alleles; D001483:Base Sequence; D012831:Bombyx / Q000235:genetics*; D003001:Cloning, Molecular; D003434:Crossing Over, Genetic; D005349:Fibroins / Q000235:genetics*; D005796:Genes; D011110:Polymorphism, Genetic; D013045:Species Specificity
D005349:Fibroins