Dataset Information

TSHR Variant Screening and Phenotype Analysis in 367 Chinese Patients With Congenital Hypothyroidism.

ABSTRACT:

Background

Genetic defects in the human thyroid-stimulating hormone (TSH) receptor (TSHR) gene can cause congenital hypothyroidism (CH). However, the biological functions and comprehensive genotype-phenotype relationships for most TSHR variants associated with CH remain unexplored. We aimed to identify TSHR variants in Chinese patients with CH, analyze the functions of the variants, and explore the relationships between TSHR genotypes and clinical phenotypes.

Methods

In total, 367 patients with CH were recruited for TSHR variant screening using whole-exome sequencing. The effects of the variants were evaluated by in-silico programs such as SIFT and polyphen2. Furthermore, these variants were transfected into 293T cells to detect their Gs/cyclic AMP and Gq/11 signaling activity.

Results

Among the 367 patients with CH, 17 TSHR variants, including three novel variants, were identified in 45 patients, and 18 patients carried biallelic TSHR variants. In vitro experiments showed that 10 variants were associated with Gs/cyclic AMP and Gq/11 signaling pathway impairment to varying degrees. Patients with TSHR biallelic variants had lower serum TSH levels and higher free triiodothyronine and thyroxine levels at diagnosis than those with DUOX2 biallelic variants.

Conclusions

We found a high frequency of TSHR variants in Chinese patients with CH (12.3%), and 4.9% of cases were caused by TSHR biallelic variants. Ten variants were identified as loss-of-function variants. The data suggest that the clinical phenotype of CH patients caused by TSHR biallelic variants is relatively mild. Our study expands the TSHR variant spectrum and provides further evidence for the elucidation of the genetic etiology of CH.

SUBMITTER: Zhang HY

PROVIDER: S-EPMC10961619 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature

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Publications

TSHR Variant Screening and Phenotype Analysis in 367 Chinese Patients With Congenital Hypothyroidism.

Zhang Hai-Yang HY Wu Feng-Yao FY Li Xue-Song XS Tu Ping-Hui PH Zhang Cao-Xu CX Yang Rui-Meng RM Cui Ren-Jie RJ Wu Chen-Yang CY Fang Ya Y Yang Liu L Song Huai-Dong HD Zhao Shuang-Xia SX

Annals of laboratory medicine 20240304 4

<h4>Background</h4>Genetic defects in the human thyroid-stimulating hormone (TSH) receptor (TSHR) gene can cause congenital hypothyroidism (CH). However, the biological functions and comprehensive genotype-phenotype relationships for most TSHR variants associated with CH remain unexplored. We aimed to identify TSHR variants in Chinese patients with CH, analyze the functions of the variants, and explore the relationships between TSHR genotypes and clinical phenotypes.< ...[more]

PMID: 38433572

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Project description:Congenital Hypothyroidism occurs in 1:3500 live births and is therefore the most common congenital endocrine disorder. A spectrum of defective thyroid morphology, termed thyroid dysgenesis, represents 80% of permanent CH cases. Although several candidate genes have been implicated in thyroid development, comprehensive screens failed to detect mutation carriers in a significant number of patients with non-syndromic TD. Due to the sporadic occurrence of TD, de novo chromosomal rearrangements are conceivably representing one of the molecular mechanisms participating in its aetiology. Recently, the use of array CGH technique has provided the ability to map these variations genomewide with high resolution. We performed an array CGH screen of 74 TD patients to determine the role of copy number variants (CNV) in the aetiology of the disease. We identified novel CNVs in 8.75% of all patients that have not been described as frequent variations in the healthy population. Affected patients presented with athyreosis or thyroid hypoplasia and in one case with associated heart malformation. We selected 74 patients with thyroid dysgenesis for array CGH analysis. All individuals were detected in neonatal screening programs and abnormal thyroid gland morphology was subsequently confirmed by ultrasound examination. Intragenic mutations in NKX2-1, FOXE1 and NKX2.5 had been previously excluded in phenotype characteristic individuals. PAX8 mutations were excluded in all patients with hypoplastic thyroids by direct sequencing of the coding exons 1-11. The study was approved by the local ethics committee. Genomic DNA of all subjects as well as of healthy controls was isolated from peripheral blood leucocytes using the Qiagen DNA blood mini kit (Qiagen, Hilden, Germany). Array-comparative genomic hybridization was carried as described previously {Erdogan, 2006 #142; Pinkel, 1998 #151}. In brief, sonicated patient- and control DNA was labeled by random priming with Cy3-dUTP and Cy5-dUTP (Bioprime Array CGH, Invitrogen, Carlsbad, CA), respectively, and hybridized onto a submegabase resolution tiling path BAC array, consisting of ~ 36 000 BAC clones obtained from several sources as described elsewhere {Fiegler, 2003 #198; Ishkanian, 2004 #196; Krzywinski, 2004 #197} . Step-by-step protocols are also provided at http://www.molgen.mpg.de/~abt_rop/molecular_cytogenetics/. Arrays were scanned with the G2565BA Agilent Microarray Scanner System (resolution 10 µm; PMT 100 % for Cy3/Cy5, respectively) (Agilent Inc. Santa Clara, CA) and analyzed using GENEPIX Pro 5.0 Software. Analysis and visualization of array CGH data were performed with our software package CGHPRO {Chen, 2005 #143}. For the assessment of copy number gains and losses, we used conservative log2 ratio thresholds of 0.3 and -0.3, respectively. Deviant signal intensity ratios involving three or more consecutive BAC clones were considered to be potentially pathogenic, unless they were covered by more than one known DNA copy number variant, as listed in the Database of Genomic Variants (http://projects.tcag.ca/variation/) or covered by > 50% of their length at least once in our reference set of 600 samples. Potentially pathogenic CNVs were verified by array CGH on a 244k oligonucleotide array from Agilent following the manufacturer’s instructions (Protocol-No. G4410-90010). Confirmed CNVs were tested for inheritance by co-hybridization of parental DNA on BAC arrays as described above. All chromosome coordinates are referring to the UCSC Genome Browser Assembly May 2004 (hg17/ NCBI Build 35; available at: http://genome.ucsc.edu/cgi-bin/hgGateway?hgsid=99195739&clade=vertebrate&org=Human&db=hg17). Cytoscape {Shannon, 2003 #201} was used for the elucidation of potential interactions between genes within the intervals of interest.

Project description:Congenital hypothyroidism (CH) is a common neonatal endocrine disorder that is characterized by irreversible neurodevelopmental and growth retardation due to insufficient biosynthesis of thyroid hormones at birth. Determining the causative genetic variants in infants is important for neonatal management. It was aimed to evaluate the variant frequencies and spectrum of CH in the neonatal population of Foshan, China. A total of 105 unrelated patients with CH and 138 controls from a neonatal screening program in Foshan, China were selected. A multiplex PCR amplification-based capture panel was performed which targeted the exon regions of 30 CH-related genes. Next-generation sequencing data were processed using an in-house bioinformatics system. A total of 91 variants distributed across 16 genes were identified in 74.29% (78/105) of the patients, of which 16 were novel variants and 75 were known variants. The most frequently mutated gene was DOUX2, followed by TG, TSHR and TPO. Specifically, DUOX2 variants p.Lys530Ter, p.Arg683Leu, p.Arg1110Gln, and IVS28 + 1G>T were highly recurrent in the cohort of the present study. Bi-allelic variants in DUOX2, TSHR and TPO were identified in 24.76% (26/105) of the patients. Monoallelic variants were identified in 28.57% (30/105) of the patients. Oligogenic variants were identified in 19.05% (20/105) of the patients. The most common variant combinations of oligogenic variants were DUOX2 and TG, and DUOX2 and SLC26A4. In addition, 2 patients harbored tri-allelic and tetra-allelic variants in DUOX2, respectively. In conclusion, DUOX2, TG, TSHR and TPO variants were the most common genetic defects in patients with CH in the neonatal population of Foshan. Specifically, biallelic DUOX2 variants were highly prevalent in the cohort. Further, the investigation provided a variant spectrum of CH-related genes and identified novel variants, which may allow for an improved understanding of the underlying genetic etiology of CH and provide evidence for further molecular epidemiological investigations that can guide preventive and therapeutic programs.

Dataset Information

TSHR Variant Screening and Phenotype Analysis in 367 Chinese Patients With Congenital Hypothyroidism.

Background

Methods

Results

Conclusions

Publications

<i>TSHR</i> Variant Screening and Phenotype Analysis in 367 Chinese Patients With Congenital Hypothyroidism.

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