POP4 and chronic obstructive pulmonary disease: The genes ABCA10, BHLHE41, CD200, CYBB, GATM, GBP1, LEPR, LMO7, LRP1, POP4, PTCH1, SCN7A, SLFN12L, TTC5, and VEPH1 have been previously associated to COPD [52–68].