2. Academic Validation
  3. Bi-allelic variants in the mitochondrial RNase P subunit PRORP cause mitochondrial tRNA processing defects and pleiotropic multisystem presentations

Bi-allelic variants in the mitochondrial RNase P subunit PRORP cause mitochondrial tRNA processing defects and pleiotropic multisystem presentations

  • Am J Hum Genet. 2021 Nov 4;108(11):2195-2204. doi: 10.1016/j.ajhg.2021.10.002.
Irit Hochberg 1,  Leigh A M Demain 2,  Julie Richer 3,  Kyle Thompson 4,  Jill E Urquhart 2,  Alessandro Rea 2,  Waheeda Pagarkar 5,  Agustí Rodríguez-Palmero 6,  Agatha Schlüter 7,  Edgard Verdura 7,  Aurora Pujol 8,  Pilar Quijada-Fraile 9,  Albert Amberger 10,  Andrea J Deutschmann 10,  Sandra Demetz 10,  Meredith Gillespie 3,  Inna A Belyantseva 11,  Hugh J McMillan 12,  Melanie Barzik 11,  Glenda M Beaman 2,  Reeya Motha 13,  Kah Ying Ng 14,  James O'Sullivan 2,  Simon G Williams 2,  Sanjeev S Bhaskar 2,  Isabella R Lawrence 4,  Emma M Jenkinson 15,  Jessica L Zambonin 3,  Zeev Blumenfeld 16,  Sergey Yalonetsky 17,  Stephanie Oerum 18,  Walter Rossmanith 19,  Genomics England Research Consortium,  Wyatt W Yue 18,  Johannes Zschocke 10,  Kevin J Munro 20,  Brendan J Battersby 14,  Thomas B Friedman 11,  Robert W Taylor 4,  Raymond T O'Keefe 21,  William G Newman 22
Affiliations

Affiliations

  • 1 Institute of Endocrinology, Diabetes, and Metabolism, Rambam Health Care Campus, Haifa 3109601, Israel; Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 3109601, Israel.
  • 2 Division of Evolution, Infection, and Genomics, School of Biological Sciences, University of Manchester, Manchester M13 9PL, UK; Manchester Centre for Genomic Medicine, St Mary's Hospital, Manchester University NHS Foundation Trust, Manchester M13 9WL, UK.
  • 3 Department of Genetics, Children's Hospital of Eastern Ontario, Ottawa, ON K1H 8L1, Canada.
  • 4 Wellcome Centre for Mitochondrial Research, Clinical and Translational Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne NE2 4HH, UK.
  • 5 Royal National ENT and Eastman Dental Hospital, University College London Hospitals, London WC1E 6DG, UK.
  • 6 Neurometabolic Diseases Laboratory, Bellvitge Biomedical Research Institute, L'Hospitalet de Llobregat, and Center for Biomedical Research on Rare Diseases, 08908 Barcelona, Spain; Paediatric Neurology Unit, Hospital Universitari Germans Trias i Pujol, Universitat Autònoma de Barcelona, 08916 Barcelona, Spain.
  • 7 Neurometabolic Diseases Laboratory, Bellvitge Biomedical Research Institute, L'Hospitalet de Llobregat, and Center for Biomedical Research on Rare Diseases, 08908 Barcelona, Spain.
  • 8 Neurometabolic Diseases Laboratory, Bellvitge Biomedical Research Institute, L'Hospitalet de Llobregat, and Center for Biomedical Research on Rare Diseases, 08908 Barcelona, Spain; Catalan Institution for Research and Advanced Studies, 08010 Barcelona, Spain.
  • 9 Unit of Mitochondrial and Inherited Metabolic Diseases, Pediatric Department, University Hospital 12 de Octubre, National Reference Center, European Reference Network for Hereditary Metabolic Disorders, 28041 Madrid, Spain.
  • 10 Institute of Human Genetics, Medical University Innsbruck, Innsbruck 6020, Austria.
  • 11 Laboratory of Molecular Genetics, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD 20892-3729, USA.
  • 12 Department of Pediatrics, Children's Hospital of Eastern Ontario, University of Ottawa, Ottawa, ON K1H 8L1, Canada.
  • 13 The Royal London Hospital, Whitechapel Road, Whitechapel, London E1 1FR, UK.
  • 14 Institute of Biotechnology, University of Helsinki, 00790 Helsinki, Finland.
  • 15 Division of Evolution, Infection, and Genomics, School of Biological Sciences, University of Manchester, Manchester M13 9PL, UK.
  • 16 Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 3109601, Israel.
  • 17 Department of Pediatrics, Children's Hospital of Eastern Ontario, University of Ottawa, Ottawa, ON K1H 8L1, Canada; Department of Pediatric Cardiology, Rambam Health Care Campus, Haifa 3109601, Israel.
  • 18 Newcastle MX Structural Biology Laboratory, Newcastle University, Medical School, NUBI Framlington Place, Newcastle upon Tyne NE2 4HH, UK.
  • 19 Center for Anatomy and Cell Biology, Medical University of Vienna, 1090 Vienna, Austria.
  • 20 Manchester Centre for Audiology and Deafness, School of Health Sciences, University of Manchester, Manchester M13 9PL, UK; Manchester University NHS Foundation Trust, Manchester M13 9WL, UK.
  • 21 Division of Evolution, Infection, and Genomics, School of Biological Sciences, University of Manchester, Manchester M13 9PL, UK. Electronic address: [email protected].
  • 22 Division of Evolution, Infection, and Genomics, School of Biological Sciences, University of Manchester, Manchester M13 9PL, UK; Manchester Centre for Genomic Medicine, St Mary's Hospital, Manchester University NHS Foundation Trust, Manchester M13 9WL, UK. Electronic address: [email protected].
PMID: 34715011 DOI: 10.1016/j.ajhg.2021.10.002
Abstract

Human mitochondrial RNase P (mt-RNase P) is responsible for 5' end processing of mitochondrial precursor tRNAs, a vital step in mitochondrial RNA maturation, and is comprised of three protein subunits: TRMT10C, SDR5C1 (HSD10), and PRORP. Pathogenic variants in TRMT10C and SDR5C1 are associated with distinct recessive or x-linked infantile onset disorders, resulting from defects in mitochondrial RNA processing. We report four unrelated families with multisystem disease associated with bi-allelic variants in PRORP, the metallonuclease subunit of mt-RNase P. Affected individuals presented with variable phenotypes comprising sensorineural hearing loss, primary ovarian insufficiency, developmental delay, and brain white matter changes. Fibroblasts from affected individuals in two families demonstrated decreased steady state levels of PRORP, an accumulation of unprocessed mitochondrial transcripts, and decreased steady state levels of mitochondrial-encoded proteins, which were rescued by introduction of the wild-type PRORP cDNA. In mt-tRNA processing assays performed with recombinant mt-RNase P proteins, the disease-associated variants resulted in diminished mitochondrial tRNA processing. Identification of disease-causing variants in PRORP indicates that pathogenic variants in all three subunits of mt-RNase P can cause mitochondrial dysfunction, each with distinct pleiotropic clinical presentations.

Keywords

MRPP3; PRORP; Perrault syndrome; RNase P; leukodystrophy; mitochondria; primary ovarian insufficiency; rare disease; sensorineural hearing loss.

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