Primers were designed using the Primer3 online software42 (link), at least 70 bp upstream and downstream of the variants, and PCR reactions were performed under standard conditions (for the list of primers see Supplementary Table 4). PCR products were purified by treatment with exonuclease and thermosensitive alkaline phosphatase (Thermo Fisher Scientific, Waltham, MA, USA) and analyzed by Sanger sequencing using the Big Dye Terminator v3.1 Cycling Sequencing Kit (Applied Biosystem, Foster City, CA, USA) on an ABI 3730XL platform (Applied Biosystems). Sequencing data were analyzed using the Sequencher v4.8, SnapGene (https://www.snapgene.com), and Chromas Lite v2.01 software and compared with wild-type samples and reference sequences from NCBI and Ensembl databases. Furthermore, frequency of all candidate variants was verified in a database of 800 Iranian healthy individuals (https://www.iranome.ir/).
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