Target region selected for this the study. The genomic region chr19:44,902,730–44,915,006 (hg38) visualized in the UCSC Genome Browser, identifying the single-nucleotide polymorphisms (SNVs) included in dbSNP. SNVs indicated with gray ticks represent synonymous variants in coding regions. SNVs indicated with red ticks represent non-synonymous variants in coding regions. SNVs indicated with blue ticks represent variants in untranslated regions. SNVs indicated with black ticks represent either variants in intronic regions or upstream/downstream gene variants. The positions of the PCR primers are shown in green.