Abstract:
:Dysfunction of mitochondrial translation is an increasingly 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 demonstrate 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.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Jackson CB,Huemer M,Bolognini R,Martin F,Szinnai G,Donner BC,Richter U,Battersby BJ,Nuoffer JM,Suomalainen A,Schaller Adoi
10.1093/hmg/ddy374subject
Has Abstractpub_date
2019-02-15 00:00:00pages
639-649issue
4eissn
0964-6906issn
1460-2083pii
5144443journal_volume
28pub_type
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