A GWAS study revealed that SLC30A8 is another common SLC loci for T2DM, and its polymorphisms are linked to the T2DM susceptibility of various populations (Tabara et al., 2009; Dupuis et al., 2010; Seman et al., 2015; Phani et al., 2016; Nikitin et al., 2017). The gene discussed is CCL21; the disease is type 2 diabetes mellitus.