IL13 and asthma: Further, more than 100 genes have been shown to cause asthma, such as the BsmI (rs1544410) and ApaI (rs7975232) polymorphisms of the vitamin D receptor gene, the rs20541 and rs1800925 polymorphisms of IL13, and the rs4950928, rs10399931, and rs8883125 polymorphisms of chitinase 3-like 1 [14,15,16].