A novel mutation in BCS1L associated with deafness, tubulopathy, growth retardation and microcephaly

Jackson, Christopher; Bauer, M F; Schaller, André; Kotzaeridou, U; Ferrarini, A; Hahn, Dagmar Karen; Chehade, H; Barbey, F; Tran, C; Gallati, S; Haeberli, Annemarie; Eggimann, S; Bonafé, L; Nuoffer, Jean-Marc (2016). A novel mutation in BCS1L associated with deafness, tubulopathy, growth retardation and microcephaly. European journal of pediatrics, 175(4), pp. 517-525. Springer 10.1007/s00431-015-2661-y

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We report a novel homozygous missense mutation in the ubiquinol-cytochrome c reductase synthesis-like (BCS1L) gene in two consanguineous Turkish families associated with deafness, Fanconi syndrome (tubulopathy), microcephaly, mental and growth retardation. All three patients presented with transitory metabolic acidosis in the neonatal period and development of persistent renal de Toni-Debré-Fanconi-type tubulopathy, with subsequent rachitis, short stature, microcephaly, sensorineural hearing impairment, mild mental retardation and liver dysfunction. The novel missense mutation c.142A>G (p.M48V) in BCS1L is located at a highly conserved region associated with sorting to the mitochondria. Biochemical analysis revealed an isolated complex III deficiency in skeletal muscle not detected in fibroblasts. Native polyacrylamide gel electrophoresis (PAGE) revealed normal super complex formation, but a shift in mobility of complex III most likely caused by the absence of the BCS1L-mediated insertion of Rieske Fe/S protein into complex III. These findings expand the phenotypic spectrum of BCS1L mutations, highlight the importance of biochemical analysis of different primary affected tissue and underline that neonatal lactic acidosis with multi-organ involvement may resolve after the newborn period with a relatively spared neurological outcome and survival into adulthood. CONCLUSION Mutation screening for BCS1L should be considered in the differential diagnosis of severe (proximal) tubulopathy in the newborn period. What is Known: • Mutations in BCS1L cause mitochondrial complex III deficiencies. • Phenotypic presentations of defective BCS1L range from Bjornstad to neonatal GRACILE syndrome. What is New: • Description of a novel homozygous mutation in BCS1L with transient neonatal acidosis and persistent de Toni-Debré-Fanconi-type tubulopathy. • The long survival of patients with phenotypic presentation of severe complex III deficiency is uncommon.

Item Type:

Journal Article (Original Article)

Division/Institute:

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

UniBE Contributor:

Jackson, Christopher; Schaller, André; Hahn, Dagmar Karen; Haeberli, Annemarie and Nuoffer, Jean-Marc

Subjects:

600 Technology > 610 Medicine & health

ISSN:

0340-6199

Publisher:

Springer

Language:

English

Submitter:

Marie-Christine Müller

Date Deposited:

15 Mar 2016 14:09

Last Modified:

19 Mar 2016 01:31

Publisher DOI:

10.1007/s00431-015-2661-y

PubMed ID:

26563427

Uncontrolled Keywords:

BCS1L; Deafness; Fanconi syndrome; Glycosuria; Growth retardation; Hypoglycaemia; Isolated complex III deficiency and assembly; Lactic acidosis; Microcephaly; Mitochondrial disorder; Rieske iron-sulphur protein

BORIS DOI:

10.7892/boris.76971

URI:

https://boris.unibe.ch/id/eprint/76971

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