Abstract
Purpose
Primary congenital hypothyroidism (CH) is the most common endocrine disease in children and one of the preventable causes of both cognitive and motor deficits. We present a genetic and bioinformatics investigation of rational clinical design in 17 Argentine patients suspected of CH due to thyroid dyshormonogenesis (TDH).
Methods
Next-Generation Sequencing approach was used to identify variants in Thyroid Peroxidase (TPO) and Dual Oxidase 2 (DUOX2) genes. A custom panel targeting 7 genes associated with TDH [(TPO), Iodothyrosine Deiodinase I (IYD), Solute Carrier Family 26 Member 4 (SLC26A4), Thyroglobulin (TG), DUOX2, Dual Oxidase Maturation Factor 2 (DUOXA2), Solute Carrier Family 5 Member 5 (SLC5A5)] and 4 associated with thyroid dysembryogenesis [PAX8, FOXE1, NKX2-1, Thyroid Stimulating Hormone Receptor (TSHR)] has been designed. Additionally, bioinformatic analysis and structural modeling were carried out to predict the disease-causing potential variants.
Results
Four novel variants have been identified, two in TPO: c.2749-2 A > C and c.2752_2753delAG, [p.Ser918Cysfs*62] and two variants in DUOX2 gene: c.425 C > G [p.Pro142Arg] and c.2695delC [p.Gln899Serfs*21]. Eighteen identified TPO, DUOX2 and IYD variants were previously described. We identified potentially pahogenic biallelic variants in TPO and DUOX2 in 7 and 2 patients, respectively. We also detected a potentially pathogenic monoallelic variant in TPO and DUOX2 in 7 and 1 patients respectively.
Conclusions
22 variants have been identified associated with TDH. All described novel mutations occur in domains important for protein structure and function, predicting the TDH phenotype.
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Data availability
Data and material are available from the authors upon request.
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Acknowledgements
M.F.M. and M.G.P. are research fellows of the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). F.S.B., A.C., H.M.T., and C.M.R. are established investigators of the CONICET.
Author contributions:
M.F.M., F.S.B., E.B.M., E.A., M.C.O., M.G.P., H.M.T. and C.M.R. conducted experiments, specifically, M.F.M. contributed to performing Sanger sequencing, structural modeling analysis and checking references, F.S.B. contributed to performing Sanger sequencing, E.B.M. and C.M.R. contributed to performing and analyzing Next-Generation Sequencing, E.A. contributes with technical assistance of the experimental protocols, M.C.O. contributed to performing structural modeling protocols, M.G.P. and H.M.T. contributed to performing bioinformatic prediction tools. P.P., G.S., V.A.B., A.C., M.B.M. and V.G.G. were involved in the recruitment of patients and acquisition of clinical data and blood samples. R.G.-S. contributed to the acquisition of funds and the design of the study. H.M.T. and C.M.R. contributed to the acquisition of funds, the conception and design of the study and they contributed to the writing of the paper. C.M.R. is the study chief investigator. All authors critically reviewed and participated in manuscript revision and approved the final draft.
Funding
This study was funded by grants from the Fondo para la Investigación Científica y Tecnológica (FONCyT-ANPCyT-MINCyT, PICT 2014-1193 to CMR, PICT 2015-1811 and PICT-2018-02146 to H.M.T.), CONICET (PIP 2015-11220150100499 to C.M.R.), Universidad de Buenos Aires (UBACyT 2016-20020150100099BA and 2020-20020190100050BA to C.M.R.) and Fondo de Investigación Sanitaria/FEDER (PI16/01920 and PI20/01589 to R.G.-S.).
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The studies involving human participants were reviewed and approved by the Ethical Committee of the Faculty of Pharmacy and Biochemistry of the University of Buenos Aires (CEIC-FFyB, No. 1094). Written informed consent was obtained from the parents of the children involved in this study.
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Molina, M.F., Papendieck, P., Sobrero, G. et al. Mutational screening of the TPO and DUOX2 genes in Argentinian children with congenital hypothyroidism due to thyroid dyshormonogenesis. Endocrine 77, 86–101 (2022). https://doi.org/10.1007/s12020-022-03054-3
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DOI: https://doi.org/10.1007/s12020-022-03054-3