1. The 1316T>C missenses mutation in MTHFR contributes to MTHFR deficiency by targeting MTHFR to proteasome degradation
- Author
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Xi Liu, Xiaojun Wang, Zhe Wang, Limin Zhang, Tao Peng, Wenping Liang, Yu Li, Menghan Wang, and Hong Lu
- Subjects
Baclofen ,Proteasome Endopeptidase Complex ,Aging ,Adolescent ,Methylenetetrahydrofolate reductase deficiency ,molecular mechanisms ,Mutation, Missense ,Neural Conduction ,Single-nucleotide polymorphism ,pathogenic mutation ,medicine.disease_cause ,Polymorphism, Single Nucleotide ,Exon ,Folic Acid ,Methionine ,single nucleotide polymophorism ,Mutant protein ,Muscle Hypertonia ,medicine ,Humans ,SNP ,Cognitive Dysfunction ,Allele ,Alleles ,Methylenetetrahydrofolate Reductase (NADPH2) ,Genetics ,Mutation ,Reflex, Abnormal ,biology ,Muscle Relaxants, Central ,MTHFR deficiency ,Brain ,Cell Biology ,medicine.disease ,proteasome degradation ,Magnetic Resonance Imaging ,Spine ,digestive system diseases ,Vitamin B 12 ,Psychotic Disorders ,Muscle Spasticity ,Methylenetetrahydrofolate reductase ,Proteolysis ,Vitamin B Complex ,biology.protein ,Ataxia ,Female ,Homocystinuria ,Research Paper - Abstract
5,10-methylenetetrahydrofolate reductase (MTHFR) deficiency is a rare hereditary disease characterized by defects in folate and homocysteine metabolism. Individuals with inherited MTHFR gene mutations have a higher tendency to develop neurodegeneration disease as Alzheimer’ disease and atherosclerosis. MTHFR is a rate-limiting enzyme catalyzing folate production, various SNPs/mutations in the MTHFR gene have been correlated to MTHFR deficiency. However, the molecular mechanisms underpinning the pathogenic effects of these SNPs/mutations have not been clearly understood. In the present study, we reported a severe MTHFR deficiency patient with late-onset motor dysfunction and sequenced MTHFR gene exons of the family. The patient carries an MD-associating SNP (rs748289202) in one MTHFR allele and the rs545086633 SNP with unknown disease relevance in the other. The rs545086633 SNP (p.Leu439Pro) results in an L439P substitution in MTHFR protein, and drastically decreases mutant protein expression by promoting proteasomal degradation. L439 in MTHFR is highly conserved in vertebrates. Our study demonstrated that p.Leu439Pro in MTHFR is the first mutation causing significant intracellular defects of MTHFR, and rs545086633 should be examined for the in-depth diagnosis and treatment of MD.
- Published
- 2020
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