Abstract:
BACKGROUND:Hypoparathyroidism, deafness, and renal dysplasia (HDR) syndrome is a rare autosomal dominant disorder caused by mutations in the zinc finger transcription factor gene, GATA3. GATA3 has 2 zinc finger domains, which play an important role in the increase in target gene transcription activity. CASE PRESENTATION:A 50-year-old woman and her 27-year-old daughter were followed up because of hypoparathyroidism. They had bilateral sensorineural deafness. Abdominal computed tomography scanning revealed renal dysplasia in the mother, but no renal anomaly in the daughter. Direct sequencing of GATA3 gene revealed a novel heterozygous missense mutation at codon 299 (p.R299Q) in exon 4. This mutation is located at the junction between the 2 zinc fingers. The structure prediction showed that it caused a conformation change in this junction area, affecting the spatial position of the zinc fingers. Additionally, a more marked conformation change was observed in the N-terminal zinc finger region compared to that in the C-terminal region. Functional analysis of this mutant protein using an in vitro luciferase reporter assay system confirmed that the mutation abolished the enhancing effects of wild-type GATA3 on the promoter activity of the consensus GATA responsive element and that of human PTH gene. CONCLUSION:We identified a novel R299Q mutation in GATA3 in a Japanese family with HDR syndrome. We confirmed that R299Q is a loss-of-function mutation, due to the extensive conformational change in the zinc fingers of GATA3.
journal_name
BMC Endocr Disordjournal_title
BMC endocrine disordersauthors
Okawa T,Yoshida M,Usui T,Kudou T,Iwasaki Y,Fukuoka K,Takahashi N,Uehara Y,Oiso Ydoi
10.1186/s12902-015-0065-7subject
Has Abstractpub_date
2015-10-30 00:00:00pages
66issn
1472-6823pii
10.1186/s12902-015-0065-7journal_volume
15pub_type
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pub_type: 杂志文章,meta分析,评审
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