一种新型的AP1S2变种导致X链接智力障碍的泄漏拼接:进一步划分和家族内变异性
Saisuda Noojarern1, Thipwimol Tim-Aroon1, Kingthong Anurat2
1Division of Medical Genetics, Department of Pediatrics, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand.
American journal of medical genetics. Part A
|April 29, 2024
概括
佩蒂格鲁综合征是由AP1S2基因突变引起的,导致智力障碍. 一种新型变异导致了泄漏的拼接,解释了各种症状,并支持了疾病的可变表达.
科学领域:
- 遗传学和分子生物学
- 神经发育障碍 神经发育障碍
- 罕见疾病 罕见疾病
背景情况:
- 佩蒂格鲁综合征 (PGS) 是一种X链接智力障碍 (XLID),与AP1S2基因突变有关.
- 之前的研究已经确定了AP1S2中的各种病原性等位基因,所有这些都导致功能丧失.
- PGS的临床谱包括不同严重程度的智力障碍和渐进的性.
研究的目的:
- 描述一个泰国家庭,其中六名患者表现出与佩蒂格鲁综合征一致的症状.
- 为了确定这个家族中佩蒂格鲁综合征的遗传原因,并调查分子机制.
- 审查有关AP1S2突变及其相关临床表型的现有文献.
主要方法:
- 对六名受影响个体的临床评估,包括详细的表型和面部分析.
- 基因分析以确定AP1S2基因中的突变.
- 用mRNA分析来研究已识别变体的功能后果,包括拼接分析.
- 报告的AP1S2病原性等位基因和患者队列的综合文献综述.
主要成果:
- 在泰国家族中发现了一种新的AP1S2变种 (c.1-2A>G).
- mRNA分析显示有泄漏的拼接,产生了两个异常的转录,导致蛋白质产品发生变化.
- 文献审查证实了51名患者和11个致病性AP1S2基因,所有功能丧失,主要是严重到严重的ID (54.8%).
- 观察到家族内部的临床变异性,包括智力障碍,言语沟通有限,性和单边白内障.
结论:
- 在AP1S2中发现的泄漏拼接变异可能是Pettigrew综合征家族内临床变异的原因.
- 这些发现支持已知的变量表达和佩蒂格鲁综合征的神经进展性质.
- 这项研究扩大了对AP1S2突变及其对XLID的影响的理解.
相关概念视频
RNA Splicing
56.3K
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
56.3K
Alternative RNA Splicing
21.1K
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
21.1K
Pleiotropy
40.4K
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,...
40.4K
Exon Recombination
3.6K
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon...
Exon shuffling follows “splice frame rules.” Each exon...
3.6K
Leaky Scanning
5.1K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
5.1K
Sex-linked Disorders
102.0K
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.
102.0K


