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Relationships of GDAP1 Mutations to Disease Phenotype and Mechanisms of Therapeutic Action of Oxidative Metabolism Activators in a Patient with Charcot–Marie–Tooth Neuropathy Type 2Kстатья
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 4 марта 2026 г.
- Авторы: Borisova Nadejda R., Emelyanova Alina A., Solovjeva Olga N., Balashova Natalia V., Sidorova Olga P., Bunik Victoria I.
- Журнал: Biochemistry (Moscow)
- Том: 90
- Номер: 11
- Год издания: 2025
- Издательство: Pleiades Publishing, Ltd
- Местоположение издательства: Road Town, United Kingdom
- Первая страница: 1678
- Последняя страница: 1697
- DOI: 10.1134/s0006297925601911
- Аннотация: The development of personalized medicine, including the treatment of hereditary diseases, re-quires translation of advances in biochemistry into medical practice. Our work is dedicated to solving thisproblem in a clinical case of hereditary Charcot–Marie–Tooth neuropathy type 2K (CMT2K), induced by thecompound heterozygous mutations in the GDAP1 gene leading to the protein variants with the most commonin Europe substitution L239F (inherited from the father) and previously uncharacterized substitution A175P(inherited from the mother). The ganglioside-induced differentiation-associated protein 1 (GDAP1) encoded bythe GDAP1 gene is located in the outer mitochondrial membrane and belongs to the glutathione S-transferasesuperfamily. Our structure-function analysis of GDAP1 shows that dimerization of its monomers with eitherL239F or A175P substitutions, along with the half-of-the-sites reactivity of GDAP1 to hydrophobic ligands, maysynergistically impair the binding due to the double amino acid substitution in one of the active sites. Thismechanism explains the early disease onset and progress in the child, whose parents heterozygous by eachof the mutations are asymptomatic. Published phenotypes of amino acid substitutions in the GDAP1 regioncomprising the binding site for hydrophobic compounds are analyzed, including phenotypes of the homozy-gous L239F substitution and its compound heterozygous combinations with other substitutions in this region.Based on the found association of these substitutions with the axonal form of Charcot–Marie–Tooth disease(CMT) and disturbances in the NAD+- and thiamine diphosphate (ThDP)-dependent mitochondrial metabolism,the therapeutic effect of nicotinamide riboside (NR) and thiamine (precursors of NAD+ and ThDP, respective-ly) in the patient is studied. Oral administration of thiamine and NR increases levels of ThDP and NAD+ inthe patient’s blood, improves the hand grip strength, and, after a long-term administration, normalizes theThDP-dependent metabolism. After the therapy, the diseased-altered activities of transketolase (TKT) and itsapo-form, as well as the relationship between the activity of the TKT holoenzyme and ThDP and NAD+ levelsin the patient’s blood, approach those of healthy women. Our results demonstrate the therapeutic potentialof thiamine and NR in correcting metabolic dysregulation in CMT caused by mutations in GDAP1, suggesting the underlying molecular mechanisms. Genetic diagnostics and biochemical characterization of mechanismsinvolved in the pathogenicity of mutations in clinically asymptomatic patients or patients at the early CMTstages may increase the efficacy of therapy, as it is easier to protect from the accumulating metabolic damagethan to reverse it.
- Добавил в систему: Емельянова Алина Антоновна