RRM2B-related mitochondrial DNA depletion syndrome, encephalomyopathic form with renal tubulopathy
Last updated 13 Nov 2023
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RRM2B-related mitochondrial DNA depletion syndrome, encephalomyopathic form with renal tubulopathy (RRM2B-MDS) is a severe condition that begins in infancy and affects multiple body systems. It is associated with brain dysfunction combined with muscle weakness (encephalomyopathy). Many affected individuals also have a kidney dysfunction known as renal tubulopathy.
Description
RRM2B-related mitochondrial DNA depletion syndrome, encephalomyopathic form with renal tubulopathy (RRM2B-MDS) is a severe condition that begins in infancy and affects multiple body systems. It is associated with brain dysfunction combined with muscle weakness (encephalomyopathy). Many affected individuals also have a kidney dysfunction known as renal tubulopathy.
Infants with RRM2B-MDS have weak muscle tone (hypotonia) and a failure to grow or gain weight at the expected rate (failure to thrive). Many have a smaller-than-normal head size (microcephaly). Due to muscle weakness, affected infants typically have difficulty controlling head movement and may have delayed development of other motor skills, such as rolling over or sitting. Weakness of the muscles used for breathing leads to serious breathing difficulties and can result in life-threatening respiratory failure. Most affected infants have a buildup of a chemical called lactic acid in the body (lactic acidosis), which can also be life-threatening.
Some individuals with RRM2B-MDS have a digestion problem known as gastrointestinal dysmotility, in which the muscles and nerves of the digestive system do not move food through the digestive tract efficiently. This disorder may lead to swallowing difficulties, vomiting, and diarrhea and can contribute to a failure to thrive. Less commonly, individuals with RRM2B-MDS develop seizures or hearing loss that is caused by nerve damage in the inner ear (sensorineural hearing loss).
Because of the severity of the signs and symptoms, people with RRM2B-MDS usually live only into early childhood.
Inheritance patterns
The source lists the following possible inheritance patterns: Autosomal recessive. More than one pattern can apply in different cases.
Related genes
Other names
Mitochondrial DNA depletion syndrome 8A (encephalomyopathic type with renal tubulopathy)
MTDPS8A
RRM2B-MDS
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Further reading and references
- RRM2B-related mitochondrial DNA depletion syndrome, encephalomyopathic form with renal tubulopathy; MedlinePlus, National Library of Medicine.
- Bornstein B, Area E, Flanigan KM, Ganesh J, Jayakar P, Swoboda KJ, Coku J, Naini A, Shanske S, Tanji K, Hirano M, DiMauro S. Mitochondrial DNA depletion syndrome due to mutations in the RRM2B gene. Neuromuscul Disord. 2008 Jun;18(6):453-9. doi: 10.1016/j.nmd.2008.04.006. Epub 2008 May 27.
- Bourdon A, Minai L, Serre V, Jais JP, Sarzi E, Aubert S, Chretien D, de Lonlay P, Paquis-Flucklinger V, Arakawa H, Nakamura Y, Munnich A, Rotig A. Mutation of RRM2B, encoding p53-controlled ribonucleotide reductase (p53R2), causes severe mitochondrial DNA depletion. Nat Genet. 2007 Jun;39(6):776-80. doi: 10.1038/ng2040. Epub 2007 May 7.
- Lim AZ, McFarland R, Taylor RW, Gorman GS. RRM2B Mitochondrial DNA Maintenance Defects. 2014 Apr 17 [updated 2021 Jun 24]. In: Adam MP, Bick S, Mirzaa GM, Wallace SE, Amemiya A, editors. GeneReviews(R) [Internet]. Seattle (WA): University of Washington, Seattle; 1993-2026. Available from http://www.ncbi.nlm.nih.gov/books/NBK195854/
- Pontarin G, Ferraro P, Bee L, Reichard P, Bianchi V. Mammalian ribonucleotide reductase subunit p53R2 is required for mitochondrial DNA replication and DNA repair in quiescent cells. Proc Natl Acad Sci U S A. 2012 Aug 14;109(33):13302-7. doi: 10.1073/pnas.1211289109. Epub 2012 Jul 30.
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