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Mitochondrial disorders v10.4 MRPS23 Ida Ertmanska changed review comment from: Additional cases:
PMID: 41506652 Mandia et al., 2026
Male proband B:II:1 with variant in MRPS23 (NM_016070.4):c.119C>T, p.(Pro40Leu) - homozygous. Individual exhibited leukoencephalopathy with distinctive white matter abnormalities, intellectual impairment, sensorineural deafness, cerebellar ataxia, pyramidal syndrome, and amyotrophic weakness in distal limbs, attributed to distal motor neuropathy. Folinic acid treatment resulted in great improvement. Fibroblast analysis showed a decrease in expression of complex I and IV subunits.

PMID: 38086984 Ittiwut et al., 2023
Report of five independent patients who had similar clinical manifestations and were homozygous for the same germline variant c.119C>T; p.P40L in MRPS23 - all from Hmong hilltribe (Thailand) - likely founder variant, estimated to have occured 1550 yrs ago. The variant is found in 2 heterozygotes in gnomAD v4.1.1.
Patients showed delayed growth and development, hearing impairment, hypoglycemia, lactic acidosis, and liver dysfunction. 1 individual had severe hearing impairment. In vitro assays of cultured fibroblasts showed combined respiratory chain complex deficiency with low activities of complexes I and IV.; to: Additional cases:
PMID: 41506652 Mandia et al., 2026
Male proband B:II:1 with variant in MRPS23 (NM_016070.4):c.119C>T, p.(Pro40Leu) - homozygous. Individual exhibited leukoencephalopathy with distinctive white matter abnormalities, intellectual impairment, sensorineural deafness, cerebellar ataxia, pyramidal syndrome, and amyotrophic weakness in distal limbs, attributed to distal motor neuropathy. Folinic acid treatment resulted in great improvement. Fibroblast analysis showed a decrease in expression of complex I and IV subunits.

PMID: 38086984 Ittiwut et al., 2023
Report of five independent patients who had similar clinical manifestations and were homozygous for the same germline variant c.119C>T; p.P40L in MRPS23 - all from Hmong hilltribe (Thailand) - likely founder variant, estimated to have occured 1550 yrs ago. The variant is found in 2 heterozygotes in gnomAD v4.1.1.
Patients showed delayed growth and development, hearing impairment, hypoglycemia, lactic acidosis, and liver dysfunction. 1 individual had severe hearing impairment. In vitro assays of cultured fibroblasts showed combined respiratory chain complex deficiency with low activities of complexes I and IV.
Mitochondrial disorders v10.4 MRPS23 Ida Ertmanska Tag Q2_26_promote_green tag was added to gene: MRPS23.
Mitochondrial disorders v10.4 MRPS23 Ida Ertmanska commented on gene: MRPS23: Comment on phenotypes: OMIM phenotype updated 14th May 2026.
Mitochondrial disorders v10.4 MRPS23 Ida Ertmanska Phenotypes for gene: MRPS23 were changed from hepatic disease and combined respiratory chain complex deficiencies to ?Combined oxidative phosphorylation deficiency 46, OMIM:618952; combined oxidative phosphorylation deficiency 46, MONDO:0033534
Mitochondrial disorders v10.3 MRPS23 Ida Ertmanska Publications for gene: MRPS23 were set to 26741492
Mitochondrial disorders v10.2 MRPS23 Ida Ertmanska Classified gene: MRPS23 as Amber List (moderate evidence)
Mitochondrial disorders v10.2 MRPS23 Ida Ertmanska Added comment: Comment on list classification: There are now 3 unrelated cases with biallelic MRPS23 missense variants and a Combined oxidative phosphorylation deficiency (defects in CI and CIV shown in fibroblast cultures). Hence, this gene should be promoted to Green at the next GMS update.
Mitochondrial disorders v10.2 MRPS23 Ida Ertmanska Gene: mrps23 has been classified as Amber List (Moderate Evidence).
Mitochondrial disorders v10.1 MRPS23 Ida Ertmanska reviewed gene: MRPS23: Rating: GREEN; Mode of pathogenicity: None; Publications: 38086984, 41506652; Phenotypes: ?Combined oxidative phosphorylation deficiency 46, OMIM:618952, combined oxidative phosphorylation deficiency 46, MONDO:0033534; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal
Mitochondrial disorders v4.71 MRPS23 Achchuthan Shanmugasundram reviewed gene: MRPS23: Rating: RED; Mode of pathogenicity: None; Publications: ; Phenotypes: ; Mode of inheritance: None
Mitochondrial disorders v2.5 MRPS23 Zornitza Stark reviewed gene: MRPS23: Rating: GREEN; Mode of pathogenicity: None; Publications: 26741492, 17873122, 25663021, 28752220; Phenotypes: Hepatic disease, Combined respiratory chain complex deficiencies, Cardiomyopathy, Tubulopathy, Lactic acidosis, Structural brain abnormalities; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal
Mitochondrial disorders v1.256 MRPS23 Ivone Leong commented on gene: MRPS23
Mitochondrial disorders v1.256 MRPS23 Ivone Leong Publications for gene: MRPS23 were set to PMID: 26741492