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Microsatellite-directed selection of breeders for the next backcross generation by using a minimal number of loci.

机译:通过使用最小数量的基因座,为下一代回交产生的微卫星定向育种者选择。

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摘要

To establish a minimal number of markers for direct selection of candidate mice used for the next mating to produce congenic mice, recombination frequencies of 53 microsatellite loci on chromosomes (chr.) 1 and 19 were examined using 41 N2 mice: the donor strain was BALB/c, and recipient strain was C57BL/6J (B6J) or C57BL/6N (B6N). These markers were spaced at 0.1 to 24.2 centimorgans (cM). Among the 41 mice, B6/B6 homozygosity ranged from 18 to 24 animals (mean, 20; 2 standard deviations, 1.36) for a given locus. There was no difference in recombination frequency between chr. 1 and 19. The recombination frequency of B6J was higher than that of B6N (P<0.05). Various densities of markers, 10 (5 markers/chr.), 8 (4 markers/chr.), and 6 (3 markers/chr.) spaced at 12.0 to 29.3, 9.0 to 45.0, and 24.5 to 53.0 cM, respectively, were selected from the 53 markers, and homozygosity was compared in each mouse. In mice with decreased homozygosity when tested using 53 markers, homozygosity differed depending on the density of the markers. The results suggested that 3 markers/chr. are sufficient for selection of the highest percentages of homozygosity but are not suitable to define mice with lower percentages of homozygosity.
机译:为了建立最少数量的标记物以直接选择用于下一次交配以产生同系小鼠的候选小鼠,使用41只N2小鼠检查了染色体(chr。)1和19上53个微卫星基因座的重组频率:供体菌株为BALB / c,受体菌株为C57BL / 6J(B6J)或C57BL / 6N(B6N)。这些标记的间距为0.1至24.2厘摩(cM)。在这41只小鼠中,对于一个给定的基因座,B6 / B6纯合度范围为18至24只动物(平均数为20; 2个标准差为1.36)。 chr之间的重组频率没有差异。如图1和19所示。B6J的重组频率高于B6N的重组频率(P <0.05)。各种密度的标记,分别为12.0至29.3、9.0至45.0和24.5至53.0 cM,分别为10(5个标记/通道),8(4个标记/通道)和6(3个标记/通道)。从53个标记中选择Aβ1,并比较每只小鼠的纯合性。当使用53种标记进行测试时,纯合性降低的小鼠中,纯合性根据标记的密度而有所不同。结果表明3个标记/ chr。足以选择最高百分比的纯合子,但不适合定义较低百分比的纯合子的小鼠。

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