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2017 ; 130
(6
): 703-709
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English Wikipedia
Clinical Auditory Phenotypes Associated with GATA3 Gene Mutations in Familial
Hypoparathyroidism-deafness-renal Dysplasia Syndrome
#MMPMID28303854
Wang L
; Lin QF
; Wang HY
; Guan J
; Lan L
; Xie LY
; Yu L
; Yang J
; Zhao C
; Liang JL
; Zhou HL
; Yang HM
; Xiong WP
; Zhang QJ
; Wang DY
; Wang QJ
Chin Med J (Engl)
2017[Mar]; 130
(6
): 703-709
PMID28303854
show ga
BACKGROUND: Hypoparathyroidism-deafness-renal dysplasia (HDR) syndrome is an
autosomal dominant disorder primarily caused by haploinsufficiency of GATA
binding protein 3 (GATA3) gene mutations, and hearing loss is the most frequent
phenotypic feature. This study aimed at identifying the causative gene mutation
for a three-generation Chinese family with HDR syndrome and analyzing auditory
phenotypes in all familial HDR syndrome cases. METHODS: Three affected family
members underwent otologic examinations, biochemistry tests, and other clinical
evaluations. Targeted genes capture combining next-generation sequencing was
performed within the family. Sanger sequencing was used to confirm the causative
mutation. The auditory phenotypes of all reported familial HDR syndrome cases
analyzed were provided. RESULTS: In Chinese family 7121, a heterozygous nonsense
mutation c.826C>T (p.R276*) was identified in GATA3. All the three affected
members suffered from sensorineural deafness and hypocalcemia; however, renal
dysplasia only appeared in the youngest patient. Furthermore, an overview of
thirty HDR syndrome families with corresponding GATA3 mutations revealed that
hearing impairment occurred earlier in the younger generation in at least nine
familial cases (30%) and two thirds of them were found to carry premature stop
mutations. CONCLUSIONS: This study highlights the phenotypic heterogeneity of HDR
and points to a possible genetic anticipation in patients with HDR, which needs
to be further investigated.