A novel mutation in BCS1L associated with deafness, tubulopathy, growth retardation and microcephaly.
Eur J Pediatr
; 175(4): 517-25, 2016 Apr.
Article
en En
| MEDLINE
| ID: mdl-26563427
ABSTRACT
UNLABELLED 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.Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Acidosis Láctica
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Colestasis
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Complejo III de Transporte de Electrones
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Enfermedades Mitocondriales
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Sordera
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Síndrome de Fanconi
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Retardo del Crecimiento Fetal
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Aminoacidurias Renales
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Hemosiderosis
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Errores Innatos del Metabolismo
Tipo de estudio:
Diagnostic_studies
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Etiology_studies
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Risk_factors_studies
Límite:
Adolescent
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Adult
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Female
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Humans
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Male
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Newborn
Idioma:
En
Revista:
Eur J Pediatr
Año:
2016
Tipo del documento:
Article
País de afiliación:
Suiza
Pais de publicación:
ALEMANHA
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ALEMANIA
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DE
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DEUSTCHLAND
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GERMANY