Table 1. Characteristics of the selected gene variants.

Locus	Position	Gene	SNP ID	Alleles	MAF	Type	Citations
6p22.2	6:26092913	HFE	rs1800562	G/A	0.06 (A)	missense	222
22q12.3	22:37066896	TMPRSS6	rs855791	G/A	0.50 (G)	missense	108
6p21.2	6:38398097	BTBD9	rs9357271	T/C	0.50 (T)	intronic	22

Abbreviations: BTBD9, BTB domain-containing protein-9 gene; HFE, homeostatic iron regulator gene; MAF, minor allele frequency; SNP, single-nucleotide polymorphism; TMPRSS6, transmembrane protease, serine 6 gene. Data are currently mapped to Genome Assembly GRCh38.p13 (Data source: www.ensembl.org)