在霍尔特-奥拉姆综合征中对TBX5误解和拼接变体的功能性表征与in silico预测
Clémence Vanlerberghe1, Anne Sophie Jourdain2, Frédéric Frenois3
1CHU Lille, Centre de Référence des Anomalies du Développement, Lille, France; Univ Lille, CHU Lille, ULR 7364-RADEME-Maladies RAres du DÉveloppement embryonnaire et du Métabolisme, Lille, France.
概括
功能测试重新分类了9种不确定的TBX5变异,作为霍尔特-奥拉姆综合征的致病原体. 这项研究强调了结合生物信息学和生物学的方法对于精确的罕见疾病变体分类的重要性.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 罕见疾病 罕见疾病
背景情况:
- 基因组变异解释对于诊断罕见的人类疾病,如霍尔特-奥拉姆综合征至关重要.
- 霍尔特-奥拉姆综合征的特征是放射性和心脏缺陷,通常是由TBX5变体引起的,通常导致单质缺陷.
- 评估TBX5中误解和拼接变异的致病性是一个重大挑战.
研究的目的:
- 功能性地评估不确定意义的TBX5变体 (VUS) 和可能的致病误解变体.
- 确定这些变异对TBX5功能及其在霍尔特-奥拉姆综合征中的作用的影响.
- 将功能测试结果与变种分类的in silico预测进行比较.
主要方法:
- 选择了14个TBX5 VUS (5个错误,9个拼接) 和6个可能的致病错误变体用于功能分析.
- 采用了一系列测试方法,包括免疫定位,西部斑,记者测试,小基因拼接测试和RT-PCR.
- 对蛋白质表达,局部化,拼接和功能的评估变异效应,将结果与in silico预测进行比较.
主要成果:
- 将14种TBX5VUS中的9种重新归类为可能致病性,证实它们与霍尔特-奥拉姆综合征的关联.
- 在9个错误变体中显示功能丧失 (8个变体) 或功能获取 (1个变体);2个错误变体显示没有功能影响.
- 在9种拼接变体中观察到拼接变化 (外子跳转,内子保留,外子缩短),导致移和过早停止子.
结论:
- 功能测试对于准确的变体分类至关重要,特别是错误感和拼接变体.
- 将生物信息学预测与实验验证相结合,可以更准确地对罕见的致病变体进行分类.
- 结合临床知识,生物信息工具和功能分析的综合方法对于诊断罕见遗传疾病至关重要.
相关概念视频
Alternative RNA Splicing
21.0K
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...
21.0K
RNA Splicing
56.2K
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...
56.2K
Pleiotropy
40.3K
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,...
40.3K
Loss of Tumor Suppressor Gene Functions
4.7K
Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
4.7K
General Transcription Factors
5.2K
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
5.2K


