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Polymorphisms in MC1R and ASIP Genes are Associated with Coat Color Variation in the Arabian Camel

机译:MC1R和ASIP基因的多态性与阿拉伯骆驼的外套颜色变化相关

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摘要

Pigmentation in mammals is primarily determined by the distribution of eumelanin and pheomelanin, the ratio of which is mostly controlled by the activity of melanocortin 1 receptor (MC1R) and agouti signaling protein (ASIP) genes. Using 91 animals from 10 Arabian camel populations, that included the 4 predominant coat color phenotypes observed in the dromedary (light brown, dark brown, black, and white), we investigated the effects of the MC1R and ASIP sequence variants and identified candidate polymorphisms associated with coat color variation. In particular, we identified a single nucleotide polymorphism (SNP), found in the coding region of MC1R (901C/T), linked to the white coat color, whereas a 1-bp deletion (23delT/T) and a SNP (25G/A) in exon 2 of ASIP are associated with both black and dark-brown coat colors. Our results also indicate support that the light-brown coat color is likely the ancestral coat color for the dromedary. These sequence variations at the MC1R and ASIP genes represent the first documented evidence of candidate polymorphisms associated with Mendelian traits in the dromedary.
机译:哺乳动物中的色素沉着主要是由Eumelanin和pheomelanin的分布决定的,而Eumelanin和pheomelanin的比例主要受黑皮质素1受体(MC1R)和刺豚鼠信号蛋白(ASIP)基因的活性控制。使用来自10个阿拉伯骆驼种群的91只动物,其中包括在单峰骆驼中观察到的4种主要的毛色表型(浅棕色,深棕色,黑色和白色),我们调查了MC1R和ASIP序列变体的影响并确定了相关的候选多态性与外套颜色变化。特别是,我们确定了一个单核苷酸多态性(SNP),该位点在MC1R(901C / T)的编码区中发现,与白色外套颜色相关,而一个1-bp缺失(23delT / T)和一个SNP(25G / ASIP外显子2中的A)与黑色和深棕色外套颜色都相关。我们的结果还表明,浅褐色的外套颜色可能是单峰驼的祖先外套颜色。 MC1R和ASIP基因上的这些序列变异代表了与单峰骆驼的孟德尔性状相关的候选多态性的第一个有据可查的证据。

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