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Abstract
Objectives: Pendred syndrome is an autosomal recessive disorder
characterized by the combination of sensorineural deafness and goiter and is caused by
biallelic mutations in the SLC26A4/PDS gene. Thyroid function is
generally reported as euthyroid or hypothyroid in this condition. We present a case of
Pendred syndrome with hyperthyroidism. Patient: An 83-year-old woman with congenital deaf–mutism presented with
complaints of nausea. She developed a large goiter and had hearing impairment. Her hearing
level was 105 dB in both ears. She presented with hyperthyroidism and was treated with
thiamazole. Results: She had a homozygous mutation in c.1579A>C:p.T527P of the
SLC26A4 gene, confirming a diagnosis of Pendred syndrome. Conclusion: Pendred syndrome may develop into hyperthyroidism if the size of
the goiter increases. Moreover, a homozygous mutation in c.1579A>C:p.T527P of the
SLC26A4 gene, which was previously reported to be associated with
nonsyndromic hearing loss with enlarged vestibular aqueduct, may also cause Pendred
syndrome.
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Affiliation(s)
- Yoshiro Kusano
- Third Department of Internal Medicine, Shirakawa Kosei General Hospital, Japan
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Fu C, Zheng H, Zhang S, Chen Y, Su J, Wang J, Xie B, Hu X, Fan X, Luo J, Li C, Chen R, Shen Y, Chen S. Mutation screening of the SLC26A4 gene in a cohort of 192 Chinese patients with congenital hypothyroidism. ARCHIVES OF ENDOCRINOLOGY AND METABOLISM 2016; 60:323-7. [PMID: 26886089 PMCID: PMC10118720 DOI: 10.1590/2359-3997000000108] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Accepted: 08/19/2015] [Indexed: 11/22/2022]
Abstract
OBJECTIVE Pendred syndrome (PS) is an autosomal recessive disorder characterised by sensorineural hearing loss and thyroid dyshormonogenesis. It is caused by biallelic mutations in the SLC26A4 gene encoding for pendrin. Hypothyroidism in PS can be present from birth and therefore diagnosed by neonatal screening. The aim of this study was to examine the SLC26A4 mutation spectrum and prevalence among congenital hypothyroidism (CH) patients in the Guangxi Zhuang Autonomous Region of China and to establish how frequently PS causes hearing impairment in our patients with CH. SUBJECTS AND METHODS Blood samples were collected from 192 CH patients in Guangxi Zhuang Autonomous Region, China, and genomic DNA was extracted from peripheral blood leukocytes. All exons of the SLC26A4 gene together with their exon-intron boundaries were screened by next-generation sequencing. Patients with SLC26A4 mutations underwent a complete audiological evaluation including otoscopic examination, audiometry and morphological evaluation of the inner ear. RESULTS Next generation sequencing analysis of SLC26A4 in 192 CH patients revealed five different heterozygous variations in eight individuals (8/192, 4%). The prevalence of SLC26A4 mutations was 4% among studied Chinese CH. Three of the eight were diagnosed as enlargement of the vestibular aqueduct (EVA), no PS were found in our 192 CH patients. The mutations included one novel missense variant p.P469S, as well as four known missense variants, namely p.V233L, p.M147I, p.V609G and p.D661E. Of the eight patients identified with SLC26A4 variations in our study, seven patients showed normal size/location of thyroid gland, and one patients showed a decreased size one. CONCLUSIONS The prevalence of SLC26A4 pathogenic variants was 4% among studied Chinese patients with CH. Our study expanded the SLC26A4 mutation spectrum, provided the best estimation of SLC26A4 mutation rate for Chinese CH patients and indicated the rarity of PS as a cause of CH.
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Affiliation(s)
- Chunyun Fu
- Department of Genetic Metabolism, Children's Hospital, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, People's Republic of China
| | - Haiyang Zheng
- Department of Genetic Metabolism, Children's Hospital, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, People's Republic of China
| | - Shujie Zhang
- Department of Genetic Metabolism, Children's Hospital, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, People's Republic of China
| | - Yun Chen
- Department of Genetic Metabolism, Children's Hospital, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, People's Republic of China
| | - Jiasun Su
- Department of Genetic Metabolism, Children's Hospital, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, People's Republic of China
| | - Jin Wang
- Department of Genetic Metabolism, Children's Hospital, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, People's Republic of China
| | - Bobo Xie
- Department of Genetic Metabolism, Children's Hospital, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, People's Republic of China
| | - Xuyun Hu
- Department of Genetic Metabolism, Children's Hospital, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, People's Republic of China
| | - Xin Fan
- Department of Genetic Metabolism, Children's Hospital, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, People's Republic of China
| | - Jingsi Luo
- Department of Genetic Metabolism, Children's Hospital, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, People's Republic of China
| | - Chuan Li
- Department of Genetic Metabolism, Children's Hospital, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, People's Republic of China
| | - Rongyu Chen
- Department of Genetic Metabolism, Children's Hospital, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, People's Republic of China
| | - Yiping Shen
- Department of Genetic Metabolism, Children's Hospital, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, People's Republic of China.,Boston Children's Hospital, Harvard Medical School, Boston, MA, United States
| | - Shaoke Chen
- Department of Genetic Metabolism, Children's Hospital, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, People's Republic of China
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