半性SMARCA1变异会导致X相关的智力障碍
Naoto Nishimura1, Takeshi Mizuguchi1, Keisuke Hamada2
1Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan.
Journal of human genetics
|May 2, 2025
概括
在男性中,SMARCA1基因的新型变异会导致X关联智力障碍 (XLID). 这项研究确定了与XLID,大脑症和性衰竭相关的新遗传变异.
科学领域:
- 遗传学 遗传学 是一个
- 神经科学是一个神经科学.
- 分子生物学分子生物学
背景情况:
- 与SNF2相关的染色体重塑ATPase 1 (SMARCA1) 的致病变体与X链接智力障碍 (XLID) 有关.
- 与SMARCA1变异相关的XLID经常表现为巨头症和各种神经症状.
研究的目的:
- 在两个无关的男性患者中,识别SMARCA1与XLID相关的新型遗传变异.
- 研究已识别的SMARCA1变异对蛋白质结构和DNA相互作用的功能影响.
主要方法:
- 整个外基因组测序用于检测XLID患者的SMARCA1变异.
- 使用结构建模来预测误解变异对SMARCA1蛋白功能的影响.
主要成果:
- 两名患有XLID的非亲属男性患者被发现具有明显的新型半性SMARCA1变异.
- 患者1呈现了巨头症,行为问题和由于无意义变体而导致的学习障碍 (p.[Gln599*]).
- 患者2表现出和语音延迟,与错误变体 (p[Arg448Leu]) 相关,预计会破坏DNA结合的稳定性.
结论:
- 血性SMARCA1变体损害其功能可能导致男性的XLID.
- 由SMARCA1变异引起的XLID可以表现为具有可变特征,包括巨头症和性衰竭.
- 鉴定到的变异,从未受到影响的母亲继承,扩大了已知的SMARCA1相关神经发育障碍的范围.
更多相关视频
00:06In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila
Published on: August 20, 2019
13.5K
08:22A Novel Strategy Combining Array-CGH, Whole-exome Sequencing and In Utero Electroporation in Rodents to Identify Causative Genes for Brain Malformations
Published on: December 1, 2017
8.5K
相关概念视频
Pedigree Analysis
81.9K
Overview
81.9K
Sex-linked Disorders
97.8K
Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
97.8K
X-linked Traits
51.3K
In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
51.3K
The Y Chromosome Determines Maleness
6.4K
The Y chromosome is a sex chromosome found in several vertebrates and mammals, including humans. In addition to 22 pairs of autosomes, the human males have one X chromosome and one Y chromosome. In these organisms, the presence or absence of the Y chromosome determines the development of male traits.
Evolution
Around 300 million years ago, the two sex chromosomes diverged from two identical autosomal chromosomes. Over time, the Y chromosome has lost most of its genes, shrinking in size....
Evolution
Around 300 million years ago, the two sex chromosomes diverged from two identical autosomal chromosomes. Over time, the Y chromosome has lost most of its genes, shrinking in size....
6.4K
X-Inactivation
37.8K
The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results.
37.8K
X and Y Chromosomes
19.4K
Among mammals, the gender of an organism is determined by the sex chromosomes. Humans have two sex chromosomes, X and Y. Every human diploid cell has 22 pairs of autosomes and one pair of sex chromosomes. A human female has two X chromosomes, while a male has one X chromosome and one Y chromosome.
The germline cells such as egg and sperm cells carry only half the number of chromosomes, i.e., 22 autosomes and one sex chromosome. All eggs have an X chromosome, while sperm cells can carry an X or...
The germline cells such as egg and sperm cells carry only half the number of chromosomes, i.e., 22 autosomes and one sex chromosome. All eggs have an X chromosome, while sperm cells can carry an X or...
19.4K
