ACO2 homozygous missense mutation associated with complicated hereditary spastic paraplegia
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Abstract
Objective To identify the clinical characteristics and genetic etiology of a family affected with hereditary spastic paraplegia (HSP).
Methods Clinical, genetic, and functional analyses involving genome-wide linkage coupled to whole-exome sequencing in a consanguineous family with complicated HSP.
Results A homozygous missense mutation was identified in the ACO2 gene (c.1240T>G p.Phe414Val) that segregated with HSP complicated by intellectual disability and microcephaly. Lymphoblastoid cell lines of homozygous carrier patients revealed significantly decreased activity of the mitochondrial aconitase enzyme and defective mitochondrial respiration. ACO2 encodes mitochondrial aconitase, an essential enzyme in the Krebs cycle. Recessive mutations in this gene have been previously associated with cerebellar ataxia.
Conclusions Our findings nominate ACO2 as a disease-causing gene for autosomal recessive complicated HSP and provide further support for the central role of mitochondrial defects in the pathogenesis of HSP.
Glossary
- ADP=
- adenosine diphosphate;
- ATP=
- adenosine triphosphate;
- ExAC=
- Exome Aggregation Consortium;
- FCCP=
- carbonyl cyanide p-trifluoromethoxyphenylhydrazone;
- HSP=
- hereditary spastic paraplegia;
- MAF=
- minor allele frequency;
- LCL=
- lymphoblastoid cell line;
- LRT=
- likelihood ratio test;
- CADD=
- Combined Annotation Dependent Depletion;
- RCR=
- respiratory control ratio;
- SNP=
- single nucleotide polymorphism;
- TCA=
- tricarboxylic acid cycle
Footnotes
↵* These authors contributed equally to this work.
Funding information and disclosures are provided at the end of the article. Full disclosure form information provided by the authors is available with the full text of this article at Neurology.org/NG.
The Article Processing Charge was funded by the authors.
- Received August 13, 2017.
- Accepted in final form December 12, 2017.
- Copyright © 2018 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American Academy of Neurology
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