德克斯特牛的阴性毛皮颜色稀释归因于SLC45A2中的误解突变
Anna M Fuller1, Carol Davidson2, Jessica L Petersen1
1Department of Animal Science, University of Nebraska-Lincoln, Lincoln, Nebraska, USA.
Animal genetics
|October 16, 2025
概括
在德克斯特牛中,SLC45A2基因的新基因突变导致薄毛颜色,深色/巧克力和浅色/奶油. 这一发现有助于养者了解和选择特定的品种外套颜色.
科学领域:
- 动物遗传学动物遗传学
- 外套颜色的遗传学
- 畜牧养殖 畜牧养殖 畜牧养殖
背景情况:
- 牛表现出三种公认的颜色:黑色,红色和色.
- 色通常与一个衰退的TYRP1基因型 (b/b) 相关,稀释黑色外套颜色.
- 德克斯特牛的一小组表现出稀释的表型 (深色/巧克力和浅色/奶油),不能由TYRP1基因型解释.
研究的目的:
- 为了确定德克斯特牛新型稀释毛皮颜色 (深/巧克力和浅/奶油) 的遗传基础.
- 为了调查一个假设的新型衰退基因型,负责这些独特的外套颜色.
- 为德克斯特牛养殖者提供基因测试资源.
主要方法:
- 进行了全基因组测序,对五只用稀释毛皮颜色的德克斯特牛进行了测序.
- 通过将稀释德克斯特的序列与226只非德克斯特对照牛的序列进行比较,进行了变异分析.
- 桑格测序用于验证在另外227头德克斯特牛中发现的遗传变异.
主要成果:
- 在稀释的德克斯特牛中发现了SLC45A2基因 (g.39790189A>C) 的新型误解变异.
- 这种SLC45A2变异完全与深色/巧克力和浅色/奶油表型分离.
- 预计这种突变 (p.Gln133Pro) 是有害的,并且与其他物种负责外套颜色稀释的基因相同.
结论:
- 在SLC45A2基因的衰退突变是德克斯特牛的深/巧克力和浅/奶油外套颜色的原因.
- 对SLC45A2变种的基因测试为德克斯特种植者提供了一个有价值的工具.
- 这项研究澄清了德克斯特品种内外套颜色变化的遗传基础.
相关概念视频
01:39Epistasis
50.1K
In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
50.1K
02:41Lethal Alleles
17.7K
Agouti: A Lethal Allele
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
17.7K
01:09Epistasis Analysis
5.6K
Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
5.6K
01:11Genetic Lingo
113.7K
Overview
113.7K
01:43Incomplete Dominance
29.6K
Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
29.6K
01:33Pleiotropy
43.2K
Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
43.2K