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Genetic analysis of low survival rate of pups in RR/Sgn inbredmice

机译:RR / Sgn自交系幼崽低成活率的遗传分析老鼠

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摘要

Newborn offspring of the inbred mouse RR/Sgn strain have a low survival rate prior to weaning. We hypothesized that this is a consequence of an inferior nurturing ability of RR/Sgn mothers and that RR/Sgn mothers have a tendency to lose their pups. We performed quantitative trait locus (QTL) mapping for inferior nurturing ability and tendency to lose pups in RR/Sgn mothers. The number of pups was adjusted to 6 per dam on the day of delivery, and the number of surviving pups and their total weight (litter weight) were scored at 12 days after birth. Nurturing ability was evaluated by litter weight, and tendency to lose pups was evaluated by scoring whether or not the mothers lost their pups. For litter weight, we identified one significant QTL on chromosome 4 and three suggestive QTLs on chromosomes 7, 9 and 17. The RR/Sgn allele was associated with lower litter weight at all loci. For the tendency to lose pups, we identified three suggestive QTLs on chromosomes 4, 9 and 16. The RR/Sgn allele was associated with an increased tendency to lose pups at all loci. These results supported our hypothesis that the low survival rate phenotype was attributable, at least in part, to a phenotype whereby mothers display inferior nurturing ability and a tendency to lose pups. Thus, it suggests that these two traits share genetic basis.
机译:近交小鼠RR / Sgn品系的新生后代在断奶前存活率较低。我们假设这是RR / Sgn母亲的营养能力低下的结果,并且RR / Sgn母亲倾向于失去幼仔。我们对RR / Sgn母亲进行了不良的养育能力和失去幼仔的趋势的定量性状基因座(QTL)定位。在分娩当天将幼崽的数量调整为每只大坝6只,并在出生后12天对存活的幼崽的数量及其总重量(垫料重量)进行评分。通过凋落物的重量评估其哺育能力,并通过对母亲是否失去其幼仔进行评分来评估其失去幼仔的趋势。对于垫料重量,我们在4号染色体上鉴定出一个重要的QTL,在7号,9和17号染色​​体上鉴定了三个提示性QTL。RR/ Sgn等位基因在所有基因座上均具有较低的垫料重量。对于幼仔的丢失趋势,我们在第4、9和16号染色体上鉴定了三个提示性QTL。RR/ Sgn等位基因与在所有基因座的幼仔丢失趋势增加相关。这些结果支持了我们的假说,即低存活率表型至少部分归因于这样一种表型,即母亲表现出较弱的养育能力并倾向于失去幼仔。因此,这表明这两个性状具有遗传基础。

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