双的DAW1变体显示了在异质毒性中具有组织特异性的作用,而没有原发性纤毛功能障碍
Research square
|February 23, 2026
概括
在DAW1基因的缺陷导致异质毒性和先天性心脏病,通过破坏毛功能. 本研究阐明了DAW1变异分类及其对特定发育过程的影响.
科学领域:
- 遗传学 是一个遗传学.
- 发展生物学 发展生物学
- 细胞生物学 细胞生物学
背景情况:
- 移动性毛缺陷导致异质毒性 (HTX),先天性心脏病 (CHD) 和初级毛功能障碍 (PCD).
- 在这些疾病中,组织特异性表现的遗传和机制基础尚不清楚.
- 蛋白臂组装因子DAW1与毛功能有关.
研究的目的:
- 在患有HTX和CHD的患者中,研究DAW1中复合异合体变异的作用.
- 使用体内模型对患者衍生的DAW1变体进行功能性表征.
- 建立解释DAW1变异及其基因型-表型相关性标准.
主要方法:
- 全基因组测序,以在试验中识别DAW1变异.
- Xenopus tropicalis模型用于评估Daw1枯竭和患者等位基因的功能.
- 功能测试用于左右图案,心脏循环和粘膜流.
主要成果:
- 在DAW1中确定了复合异性变体:一个拼接位变体 (c.648+1G>A) 和一个错误变体 (c.341G>A; p.Arg114Gln).
- 在Xenopus中,Daw1的耗尽破坏了左右模式,心脏循环和粘膜流.
- 拼接部位变异导致功能完全丧失,而p.Arg114Gln显示出上下文依赖的低形态效应,完全挽救了粘膜细胞流,但没有左向右的模式.
结论:
- 功能性证据支持将拼接部位变异重新归类为致病性,并将p.Arg114Gln作为依赖上下文的低形态等位基因.
- 发育背景对于理解DAW1相关疾病中的基因型-表型关系至关重要.
- 在体内模型对于在HTX相关条件下重新分类具有不确定的意义的变异非常有价值.
相关概念视频
Pleiotropy
43.6K
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,...
43.6K
Microtubules in Signaling
2.2K
The primary cilium, made up of microtubules, acts as antennae on the cell surfaces for relaying external stimuli into the cells. These fine hair-like structures are present, generally one per cell. These are non-motile cilia in a 9+0 microtubules arrangement, where the central pair of microtubules are absent. The primary cilia arise from the basal body embedded in the cell membrane. Intraflagellar transport (IFT) carries requisite proteins from the cytoplasm to the cilium because the primary...
2.2K
Mechanism of Ciliary Motion
5.4K
The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...
5.4K
Cystic Fibrosis: Pathogenesis
932
Cystic fibrosis (CF), an autosomal recessive disorder, significantly affects the function of exocrine glands. This genetically inherited disease is characterized by the production of thick and sticky mucus, which can severely affect various organs and systems in the body.
CF is primarily caused by a genetic mutation in a chromosome 7 gene coding for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. The most common gene mutation leading to CF is the ΔF508 mutation,...
CF is primarily caused by a genetic mutation in a chromosome 7 gene coding for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. The most common gene mutation leading to CF is the ΔF508 mutation,...
932
Cadherins in Tissue Organization
4.3K
The cadherins are a superfamily of cell adhesion molecules comprising over 180 variants, with specific tissues expressing a particular combination of cadherin types. Cadherins generally exhibit homophilic binding; i.e., cadherins on one cell bind to cadherins of the same or closely related type on another cell. Thus, cells of the same type have a specific affinity to bind to each other and sort themselves into clusters to form tissues.
Cell Sorting During Development
Cell sorting plays an...
Cell Sorting During Development
Cell sorting plays an...
4.3K
Cytoskeletal Linker Proteins - Plakins
2.9K
Plakins are large proteins with binding domains for microtubules, microfilaments, intermediate filaments, and membrane-associated protein complexes at cell junctions. Plakin functions are evolutionarily conserved and are primarily involved in organizing the different components of the cytoskeleton by crosslinking them to each other and connecting them to the cell-matrix and cell adhesion complexes. They are also known to interact with signal transducers, serve as scaffolds for signaling...
2.9K


