Genomic DNA was purified from peripheral blood mononuclear cells using the Wizard Genomic DNA Purification Kit (Promega, Madison, WI, USA). Genomic DNA (10 ng/per sample) was used for library preparation, using the DNA prep with an enrichment protocol (Illumina, San Diego, CA, USA) and a custom targeted panel of the 17 congenital hypothyroidism-causative genes TG (NM_003235.4), TPO (NM_000547.5), DUOXA2 (NM_207581.3), DUOX2 (NM_014080.4), SLC5A5 (NM_000453.2), SLC16A2 (NM_006517.4), SLC26A4 (NM_000441.1), TSHR (NM_000369.2), GNAS1 (NM_000516.4), THRB (NM_000461.4), THRA (NM_003250.5), PAX8 (NM_003466.3), NKX2.1 (NM_001079668.2), NKX2.5 (NM_004387.3), FOXE1 (NM_004473.3), IYD (NM_001164694.1), and SECISBP2 (NM_024077.4) [41 (link)]. Next-generation sequencing was performed on the NextSeq 550 platform using the Mid Output kit v2.5 (Illumina). Sequencing coverage of 30x reads was considered to be the minimum requirement for a sequence variant to be considered. Sequence data were processed using custom bioinformatic software pipelines to align reads to the HG19 reference genome. All reported variants were explored using public databases, as well as literature searches. All variants were confirmed by Sanger sequencing on a capillary ABI 3500XL sequencer using the BigDye Terminator v3.1 Cycle Sequencing kit (Thermo-Fisher Scientific, Waltham, MA, USA).
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