DNHD1 and chronic obstructive pulmonary disease: In this study, we have identified 17 genes which have not previously been detected in COPD studies, these include: LINC00942, REEP1, C6orf164, LINC00589, JAKMIP3, LINC00930, DNHD1, TMCC3, ADH7, PRKAR2B, GAD1, LOC338667, CYB5A, PIEZO2, SLITRK6, KCNA1 and LOC100507560 (Table 4).