A variant in MRPS14 (uS14m) causes perinatal hypertrophic cardiomyopathy with neonatal lactic acidosis, growth retardation, dysmorphic features and neurological involvement.

Jackson, Christopher; Huemer, Martina; Bolognini, Ramona; Martin, Franck; Szinnai, Gabor; Donner, Birgit C; Richter, Uwe; Battersby, Brendan J; Nuoffer, Jean-Marc; Suomalainen, Anu; Schaller, André (2019). A variant in MRPS14 (uS14m) causes perinatal hypertrophic cardiomyopathy with neonatal lactic acidosis, growth retardation, dysmorphic features and neurological involvement. Human molecular genetics, 28(4), pp. 639-649. Oxford University Press 10.1093/hmg/ddy374

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Dysfunction of mitochondrial translation is increasingly an important molecular cause of human disease, but structural defects of mitochondrial ribosomal subunits are rare. We used next-generation sequencing to identify a homozygous variant in the mitochondrial small ribosomal protein 14 (MRPS14, uS14m) in a patient manifesting with perinatal hypertrophic cardiomyopathy, growth retardation, muscle hypotonia, elevated lactate, dysmorphy and mental retardation. In skeletal muscle and fibroblasts from the patient there was biochemical deficiency in complex IV of the respiratory chain. In fibroblasts mitochondrial translation was impaired and ectopic expression of a wild type MRPS14 cDNA functionally complemented this defect. Surprisingly, the mutant uS14m was stable and did not affect assembly of the small ribosomal subunit. Instead, structural modeling of the uS14m mutation predicted a disruption to the ribosomal mRNA channel. Collectively, our data demonstrates pathogenic mutations in MRPS14 can manifest as a perinatal-onset mitochondrial hypertrophic cardiomyopathy with a novel molecular pathogenic mechanism that impairs the function of mitochondrial ribosomes during translation elongation or mitochondrial mRNA recruitment rather than assembly.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Medicine
04 Faculty of Medicine > Department of Haematology, Oncology, Infectious Diseases, Laboratory Medicine and Hospital Pharmacy (DOLS) > Institute of Clinical Chemistry
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR)
04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Medicine > Endocrinology/Metabolic Disorders
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > Unit Childrens Hospital > Forschungsgruppe Humangenetik

UniBE Contributor:

Jackson, Christopher; Bolognini, Ramona; Nuoffer, Jean-Marc and Schaller, André

Subjects:

600 Technology > 610 Medicine & health

ISSN:

0964-6906

Publisher:

Oxford University Press

Language:

English

Submitter:

André Schaller

Date Deposited:

20 Feb 2019 15:20

Last Modified:

20 Feb 2019 15:20

Publisher DOI:

10.1093/hmg/ddy374

PubMed ID:

30358850

BORIS DOI:

10.7892/boris.123114

URI:

https://boris.unibe.ch/id/eprint/123114

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