Cited by 12Mitochondrial Function and PathologyMetabolism and Genetic DisordersGenomics and Rare Diseases

A novel heteroplasmic mitochondrial DNA mutation, A8890G, in a patient with juvenile-onset metabolic syndrome: A case report

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YE, WEI, CHEN, SAIHUI, JIN, SHENG, LU, JIANXIN·2013·Molecular Medicine Reports

Abstract

Metabolic syndrome (MS) is a complex disorder characterized by a group of metabolic abnormalities. In the present study, the case of an 18‑year‑old male who presented with MS characteristics with central obesity (overweight and a waist circumference of 95 cm) and dyslipidemia (high TG, low HDL levels and low apoA‑I/apoB‑100) was reported. The patient's family has maternally inherited diabetes and a number of the patient's maternal relatives present MS features. For the investigation of the mitochondrial DNA variants in the patient and the patient's family, genomic DNA of all the family members were extracted from peripheral blood using routine methods. Amplification of mitochondrial DNA in 24 overlapping fragments by PCR, direct sequencing and denaturing high‑performance liquid chromatography was utilized for genetic analysis. Sequences were compared to the reference sequence to identify variants. Bioinformatic methods and databases were used to analyze conservation of the variants and to predict the protein secondary structure. With the exception of the patient, five relatives were diagnosed with MS. Moreover, 5 of the 8 family members had been diagnosed with diabetes, hearing loss and mild kidney impairment according to serum biochemical analysis. Further molecular genetic analysis indicated that the MS‑associated variant T16189C was detected in this family. Notably, a heteroplasmic mutation A8890G was detected in the patient in the mitochondrial ATP6 gene, which codes the ATP synthase subunit 6 (ATPase6). A8890G changed the highly conserved ATPase6 Lys122 into Glu122 in the mitochondrial inner membrane. However, this mutation was not detected in other family members. In conclusion, the mutation A8890G may affect the function of ATPase 6 and the production of ATP, thus contributing to juvenile‑onset MS. It was not detected in other family members possibly due to the mitochondrial genetic segregation or production of a new germline mutation in the juvenile‑onset patient.

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Authors
YE, W., CHEN, S., JIN, S., & LU, J.
Affiliations
Wenzhou Medical University (CN)
Venue
Molecular Medicine Reports
Published
2013-08-06
Volume
8
Issue
4
Pages
1060-1066
ISSN
  • 1791-2997 (ISSN-L)
  • 1791-3004
OpenAlex
W2080400903
Cited by
12
References
45
Citations by year
2023: 1 · 2022: 1 · 2020: 1 · 2019: 2 · 2018: 3 · 2017: 2 · 2015: 2
FWCI
0.30
Type
journal article
Language
en
Open access
Locations
  • Molecular Medicine Reports (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Clinical Biochemistry › Metabolism and Genetic Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genomics and Rare Diseases
Keywords
metabolic syndrome, mitochondrial DNA mutations, heteroplasmy, ATP6 gene, ATP synthase subunit 6, abdominal obesity, dyslipidemia, germline mutations
MeSH terms
Adolescent, Adult, Aged, 80 and over, Base Sequence, DNA, Mitochondrial, Female, Humans, Male, Middle Aged, Pedigree, Point Mutation, Sequence Analysis, DNA, Genetic Predisposition to Disease, Metabolic Syndrome, Mitochondrial Proton-Translocating ATPases, Genetic Association Studies

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