Sanger sequencing of regions including the FUCA1 exons revealed a 9-bp deletion (NG_013346.1:g.10233_10241delACAGGTAAG) covering four bases of the sequence at the 3′end of exon 3 and five bases at the beginning of intron 3 in the child diagnosed with metabolic syndrome (MetS) (Figure 1B) compared to control DNA (Figure 1A). Here, FUCA1 is linked to metabolic syndrome.