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Identification and analyzes of DUOX2 mutations in two familial congenital hypothyroidism cases

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Abstract

Background

Mutations in DUOX2 are the frequent cause of congenital hypothyroidism (CH), a common neonatal metabolic disorder characterized by great phenotypic variability. CH can be traditionally subclassified into two subtypes: thyroid dysgenesis (TD) and thyroid dyshormonogenesis. The objectives of this study were to analyze the genetic data of two familial CH cases, to elucidate the pathogenesis from the perspective of genetics and to review and summarize the previous findings.

Methods

Targeted regions sequencing (TRS) technology covering all exons and intron-exon boundaries of 35 known and potential CH-related candidate target genes in combination with Sanger sequencing were performed to identify the likely pathogenic mutations of the six patients with familial CH.

Results

In family 1, two DUOX2 missense mutations, namely, c.1060C>T/p.R354W in exon 10 and c.3200C>T/p.S1067L in exon 25, were found. Patient 1 (P1), P2 and P3 were transient CH (TCH) patients with eutopic thyroid glands of normal size and function. In family 2, only the mutation c.3200C>T/p.S1067L was identified. P4, P5, and P6 were diagnosed with permanent CH (PCH), which requires lifelong levothyroxine (L-T4) treatment. Furthermore, both P4 and P5 harbored properly located thyroid glands, whereas P6 had a mildly reduced gland. P1, P3, P6, and other family members carrying monoallelic or biallelic DUOX2 mutations showed no obvious abnormal clinical symptoms or signs, while P2, P4, and P5 showed umbilical hernias.

Conclusions

The present study suggests that the phenotypic features resulting from DUOX2 mutations vary greatly. The p.R354W and p.S1067L alterations or the combination of the two alterations in DUOX2 are probably only predisposing to CH and DUOX2 may be involved in the morphogenesis of the human thyroid gland. Simultaneously, the compensation of DUOX1 for the loss of DUOX2, undetectable pathogenic mutations, the effects of environmental factors, epigenetic mechanisms and the involvement of multiple genes cannot be excluded in the explanation of these genetic results.

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Author contributions

L.L. wrote the manuscript. W.L. and L.Z. conducted the experiments. Fang W., Fengqi W., and M.G. acquired the data. X.W. analyzed the data. S.L. designed the study.

Funding

This study was funded by the National Key Research and Development Program of China (grant number 2016YFC1000306).

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Authors and Affiliations

  1. Medical Genetic Department, the Affiliated Hospital of Qingdao University, Qingdao, China

    Liangshan Li, Wenmiao Liu, Fengqi Wang & Shiguo Liu

  2. Department of Clinical Laboratory, Medical College of Qingdao University, Qingdao, China

    Liangshan Li

  3. Child Health Care Department, Qingdao Women and Children’s Hospital, Qingdao, China

    Liqin Zhang

  4. Endocrinology Department, the Affiliated Hospital of Qingdao University, Qingdao, China

    Fang Wang

  5. Center for Genetic Medicine, Xuzhou Maternity and Child Health Care Hospital, Xuzhou, China

    Maosheng Gu

  6. Neonatal Screening Center, Xuzhou Maternity and Child Health Care Hospital, Xuzhou, China

    Xiuli Wang

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Li, L., Liu, W., Zhang, L. et al. Identification and analyzes of DUOX2 mutations in two familial congenital hypothyroidism cases. Endocrine 72, 147–156 (2021). https://doi.org/10.1007/s12020-020-02437-8

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