DYNC2H1拼接变异导致严重的产前短肋多样性综合征和产后口腔功能数字综合征
Alice Porto Vasconcelos1, Sofia Quental2,3, João Parente Freixo3,4
1Genetics Service, São João Universitary Hospital Center, Porto, Portugal.
Annals of human genetics
|October 3, 2024
概括
这项研究详细介绍了由DYNC2H1基因拼接变异引起的两种独特的骨纤维病例. 这些发现扩大了与DYNC2H1相关的已知的表型谱,改善了临床和分子理解.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 发展生物学 发展生物学
背景情况:
- DYNC2H1基因涉及到骨纤维病变,包括短肋多肢症候群 (SRPS).
- 在DYNC2H1中拼接变异可能导致多样化和复杂的临床表现.
- 了解基因型-表型相关性对于诊断和管理小病变至关重要.
研究的目的:
- 描述两个具有明显表型的新案例,这些表型是由DYNC2H1基因中的拼接变异产生的.
- 用下一代测序和RNA测试来描述这些表型的分子基础.
- 加强对DYNC2H1相关的骨纤维病变的临床和分子知识.
主要方法:
- 用下一代测序 (NGS) 和全外体测序 (WES) 来识别遗传变异.
- 基于聚合酶连锁反应 (PCR) 的RNA测试用于确认拼接变体的功能影响.
- 对这两种病例的临床数据和表型特征都被仔细记录下来.
主要成果:
- 案例1:一个患有严重骨异常和多种先天性异常的胎儿在DYNC2H1中呈现出复合异性可能致病变体,与SRPS类型I/III一致.
- 案例2:一名11岁的男性患有口腔面部和数字异常,在DYNC2H1中显示出复合异构体变体,其中一种可能是致病性的,另一个变体的意义不确定,导致口腔面部数字综合征.
- RNA分析证实了拼接变化,包括第二种情况下的框架内删除,同时也显示出正常转录的产生.
结论:
- 在DYNC2H1中,剪接变异可能会导致更广泛和前所未有的表型范围,包括SRPS和口腔方便数字综合征.
- 这项研究强调了基于RNA的功能研究在分类具有不确定的意义的变异方面的重要性.
- 这些发现有助于对DYNC2H1相关纤维病变的遗传基础和表型变异性有宝贵的见解.
相关概念视频
RNA Splicing
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...
Nondisjunction
During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.
Alternative RNA Splicing
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...
Nondisjunction
During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.
Alternative RNA Splicing
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...
Nondisjunction
Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers. Nondisjunction is common during anaphase I or anaphase II of meiosis. Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold sister...


