洞察与COG6-CDGG相关的病理性糖化
Zuzana Pakanová1, Maroš Krchňák1, Marek Nemčovič1
1Department of Glycobiology, Institute of Chemistry, Slovak Academy of Sciences, Bratislava, Slovakia.
Human mutation
|December 9, 2025
概括
我们发现了一种新的COG6变异,导致COG6蛋白功能在患有多系统性先天性糖化乱 (CDG) 的婴儿中完全丧失. 这一发现为COG6-CDG分子机制和潜在的诊断生物标志物提供了洞察力.
科学领域:
- 生物化学 生化学
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- 血糖代谢先天性障碍 (CDG) 是一种罕见的遗传代谢疾病.
- 蛋白质糖基化中的缺陷导致多系统性临床表现.
- COG6-CDG是一种特定的亚型,其特点是COG复合体的缺陷.
研究的目的:
- 在一个多系统性参与的婴儿中调查COG6-CDG病例.
- 确定患者病情背后的遗传原因和分子机制.
- 为了探索COG6-CDG诊断的潜在糖生物标志物.
主要方法:
- 质谱学 (MALDI,ESI-Orbitrap) 用于分析甘氨酸 (N-和O-甘氨酸).
- 下一代测序用于COG6基因的突变分析.
- 评估COG6亚单元表达,合作亚单元和逆行运输的功能研究.
主要成果:
- 在COG6基因中发现了一种新型的同卵性变异 (c.906_907delinsA),导致截断的蛋白质和功能完全丧失.
- 检测到组合N-和O-糖化缺陷,符合COG6-CDG.
- 特定的未经加工的N-甘氨酸被确定为潜在的葡萄糖生物标志物.
结论:
- 该研究描述了一种新的COG6变体,导致严重的糖化异常和蛋白质功能完全丧失.
- 多组学分析阐明了COG6-CDG的分子机制以及COG6基因的作用.
- 这些发现突出了患者的甘类型的显著变化,这是由于发现的突变.
相关概念视频
Proteoglycans
4.6K
Glycans, a class of complex heterogeneous molecules, can be covalently attached to proteins to form glycosylated proteins that regulate various physiological and pathological processes. Glycosylated proteins or glycoproteins comprise N-linked and O-linked oligosaccharides. O-glycosylation is the most common type of protein glycosylation. Here, glycans attach to the oxygen atom of the hydroxyl groups of Serine or Threonine residues. O-linked glycosylation occurs later in protein processing,...
4.6K
Protein Glycosylation
9.2K
Glycosylation, the most common post-translational modification for proteins, serves diverse functions. Adding sugars to proteins makes the proteins more resistant to proteolytic digestion. Glycosylated proteins can act as markers and receptors to promote cell-cell adhesion. Additionally, they have many essential quality control functions in the cell, such as correct protein folding and facilitating transport of misfolded proteins to the cytosol, which can be degraded.
Glycosylation occurs in...
Glycosylation occurs in...
9.2K
Oligosaccharide Assembly
3.5K
Protein glycosylation starts in the ER lumen and continues in the Golgi apparatus. Glycosyltransferases catalyze the addition of sugar molecules or glycosylation of proteins. Usually, these enzymes add sugars to the hydroxyl groups of selected serine or threonine residues to form O-linked glycans or the amino groups of asparagine residues to form N-linked glycans. Different positions on the same polypeptide chain can contain differently linked glycans.
Multiple sugar molecules that may or may...
Multiple sugar molecules that may or may...
3.5K
Cystic Fibrosis: Pathogenesis
680
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,...
680
Carbohydrate Catabolism
938
Carbohydrate catabolism is a fundamental process in cellular metabolism that enables energy extraction from glucose through two primary pathways: cellular respiration and fermentation. Both pathways begin with glycolysis, which operates independently of oxygen availability.Glycolysis: A Shared Starting PointGlycolysis is an oxygen-independent process that breaks down glucose into two molecules of pyruvic acid. During this process, a net gain of two ATP molecules and two NADH molecules is...
938
Glycosaminoglycans
6.8K
Glycosaminoglycans (GAGs), also known as mucopolysaccharides, are long and linear polymers comprising of specific repeating disaccharides - the amino sugar that can be N-acetylglucosamine or N-acetylgalactosamine, and a uronic acid that is usually glucuronic acid or iduronic acid.
GAGS are found in the extracellular matrix of vertebrates, invertebrates, and bacteria. Due to their polar nature they attract water, and serve as excellent lubricants or shock absorbers in an animal body.
Hyaluronic...
GAGS are found in the extracellular matrix of vertebrates, invertebrates, and bacteria. Due to their polar nature they attract water, and serve as excellent lubricants or shock absorbers in an animal body.
Hyaluronic...
6.8K


