CYSLTR1 and atopic asthma: For example, while variability in the genes encoding drug targets such as the cysteinyl leukotriene 1 (CYSLTR1) and 2 (CYSLTR2) receptor genes may both contribute to risk for atopic asthma in some populations (Thompson et al., 2003, 2005b, 2013; Pillai et al., 2004; Brochu-Bourque et al., 2011; Yaddaden et al., 2016), only the cysteinyl leukotriene 1 (CYSLTR1) receptor is targeted by LTMs.