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Kilquist syndrome: A novel syndromic hearing loss disorder caused by homozygous deletion of SLC12A2
Author(s) -
Macnamara Ellen F.,
Koehler Alanna E.,
D'Souza Precilla,
Estwick Tyra,
Lee Paul,
Vezina Gilbert,
Fauni Harper,
Braddock Stephen R.,
Torti Erin,
Holt James Matthew,
Sharma Prashant,
Malicdan May Christine V.,
Tifft Cynthia J.
Publication year - 2019
Publication title -
human mutation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.981
H-Index - 162
eISSN - 1098-1004
pISSN - 1059-7794
DOI - 10.1002/humu.23722
Subject(s) - biology , hearing loss , phenotype , sensorineural hearing loss , genetics , knockout mouse , receptor , gene , audiology , medicine
Syndromic sensorineural hearing loss is multigenic and associated with malformations of the ear and other organ systems. Herein we describe a child admitted to the NIH Undiagnosed Diseases Program with global developmental delay, sensorineural hearing loss, gastrointestinal abnormalities, and absent salivation. Next‐generation sequencing revealed a uniparental isodisomy in chromosome 5, and a 22 kb homozygous deletion in SLC12A2 , which encodes for sodium, potassium, and chloride transporter in the basolateral membrane of secretory epithelia. Functional studies using patient‐derived fibroblasts showed truncated SLC12A2 transcripts and markedly reduced protein abundance when compared with control. Loss of Slc12a2 in mice has been shown to lead to deafness, abnormal neuronal growth and migration, severe gastrointestinal abnormalities, and absent salivation. Together with the described phenotype of the Slc12a2 ‐knockout mouse model, our results suggest that the absence of functional SLC12A2 causes a new genetic syndrome and is crucial for the development of auditory, neurologic, and gastrointestinal tissues.