家庭猫中的β-曼诺症与MANBA的错误变异相关
Martin L Katz1, James Cook2, Charles H Vite3
1Neurodegenerative Diseases Research Laboratory, University of Missouri, Columbia, MO 65212, USA.
Gene
|November 1, 2023
概括
曼巴基因的新型基因突变导致了一只年轻猫患上严重的神经疾病,可能是遗传性β-曼诺症. 这种情况导致了渐进的运动和认知能力下降,导致猫的安乐死.
科学领域:
- 遗传学和分子生物学
- 兽医神经学 兽医神经学
- 溶酶体储存疾病 溶酶体储存疾病
背景情况:
- 一只6个月大的猫出现了渐进的运动障碍和认知能力下降.
- 临床迹象表明,这是一种先前在猫身上没有描述过的遗传性神经系统疾病.
- 猫的病情恶化,需要在10.5个月大时安乐死.
研究的目的:
- 为了确定猫的进展性神经疾病的遗传原因.
- 描述潜在的分子和细胞病理.
- 为了确定所确定的情况是否代表了猫科动物遗传性β-曼诺症的新型形式.
主要方法:
- 在受影响的猫身上进行了全基因组测序.
- 基因变异分析是使用99 Lives Cat Genome数据集进行的.
- 在大脑组织上进行了β-曼诺酶酶活性测试.
- 死后对大脑和视网膜组织的检查包括光和电子显微镜.
主要成果:
- 在MANBA基因中发现了一个同卵性误解变异 (c.2506G>A),预测了p.Gly836Arg氨基酸替代在β-mannosidase中.
- 这种特定变异在大型猫基因组数据集中不存在,这表明它是一种新的突变.
- 受影响猫的大脑中无法检测到β-曼诺酶活性,而α-曼诺酶活性则升高.
- 组织病理学揭示了大脑和视网膜细胞中广泛存在的真空包裹,这是β-曼诺索症的特征.
- 一些内含物表现出类似脂素的自光,似乎是通过自形成的.
结论:
- 鉴定到的MANBA变异可能通过消除β-曼诺酶酶活性,在猫中引起遗传性β-曼诺症.
- 这一病例代表了第一例被记录的猫类β-曼诺症病例,与一种新的基因突变有关.
- 这些发现扩大了对溶酶体储存疾病及其在家禽中的遗传基础的理解.
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