结合SSR标记和STS标记对家蚕无鳞毛翅基因的定位

家蚕突变表型无鳞毛翅(non-lepis wing,nlw)由隐性基因nlw控制。由于家蚕雌性不发生交换,文章采用有鳞毛翅品系P50和无鳞毛翅品系U06两个品系组配F1代及BC1回交群体,(U06×P50)×U06和U06×(U06×P50)分别记作BC1F和BC1M,根据已经构建的家蚕SSR分子标记连锁图谱及已经发表的有关序列对nlw基因进行了连锁及定位分析。得到8个与nlw基因连锁的SSR(Simple sequence repeat)标记和1个STS(Sequence-tagged sites)标记。BC1F群中的所有正常翅个体均表现出与(U06×P50)F1相同的杂合带型;而所有无鳞毛个体带型与亲本U06一致,为纯合型。利用BC1M群体构建了关于nlw基因的遗传连锁图,连锁图的遗传距离为125.7cM,与nlw基因最近的引物为STS标记cash2p,图距为11.4cM。

Mapping of non-lepis wing gene nlw in silkworm(Bombyx mori) using SSR and STS markers

The non-lepis wing of silkworm (Bombyx mori) is controlled by the recessive gene, nlw. Owning to lack of crossing over in females, the reciprocal backcrossed F₁ (BC₁) progenies were used for linkage analysis and mapping of nlw based on the SSR linkage map and STS markers using the wild type (+^nlw/+^nlw) silkworm strain P50 and U06 with scaleless wing (nlw/nlw). The nlw gene was linked to eight SSR markers and one STS marker. All the individuals with the wild type in the BC₁F (Using F₁ as female to backcross to the recessive parent, that is (U06×P50)×U06) showed heterozygous profile of (U06×P50) F₁, and the ones with non-lepis wing in BC₁F exhibited the homozygous profile of the strain U06. Using a reciprocal BC₁M (Using F₁ as male to backcross to the recessive parent, that is U06×(U06×P50))cross, we constructed a linkage map of 125.6 cM, and the distance between nlw and the nearest marker cash2p was 11.4 cM.