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Hearing Loss Is Part of the Clinical Picture of ENPP1 Loss of Function Mutation.
MedLine Citation:
PMID:  24216977     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Background: Ecto/nucleotide pyrophosphatase/phosphodiesterase-1 (ENPP1) loss-of-function mutations have been described in patients with autosomal recessive hypophosphatemic rickets (HR), in patients with generalized arterial calcification of infancy (GACI) and in several patients with both conditions. Out of more than 50 cases of homozygous or compound heterozygous ENPP1 loss-of-function mutations published so far, 1 case with labyrinthine deafness probably due to occlusion of inner ear supplying arteries and 2 cases of conductive hearing loss due to stapedovestibular calcification diagnosed in childhood have been reported. Aims: To report a case of ENPP1 loss-of-function novel mutation presenting with HR and very early onset and severe hearing loss. Methods: Case report and review of the literature. Results: We report on a patient homozygous for a novel 1-bp deletion in ENPP1 that presented with GACI evolving towards HR associated with a mixed hearing loss (both labyrinthine and conductive) diagnosed at 9 days of life that evolved towards profound labyrinthine deafness. Conclusion: Hearing loss is a rare finding in patients with ENPP1 loss-of-function mutations. Interestingly, it has already been described in other affected patients, in ENPP1 knock-out mice and in other diseases of pyrophosphate metabolism. Conversely it seems to be absent in children with the X-linked form of HR. © 2013 S. Karger AG, Basel.
Authors:
C Brachet; A L Mansbach; A Clerckx; P Deltenre; C Heinrichs
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-11-6
Journal Detail:
Title:  Hormone research in paediatrics     Volume:  -     ISSN:  1663-2826     ISO Abbreviation:  Horm Res Paediatr     Publication Date:  2013 Nov 
Date Detail:
Created Date:  2013-11-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101525157     Medline TA:  Horm Res Paediatr     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Pediatric Endocrinology Unit, Hôpital Universitaire des Enfants Reine Fabiola-ULB, Brussels, Belgium.
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