DNAH1 and Reduced sperm motility: In addition to the results described here, a previous study described that the phenotype of the DNAH1 mouse homolog MDHC7 knockout resulted in asthenozoospermia (decrease in the motility of the spermatozoa) and reduced tracheal ciliary beat frequency using a photo-electrical method [15] and by a study by Blouin and colleagues who identified a potential novel PCD locus on chromosome 3p21 [25] both indicative that aberrations in DNAH1 may cause PCD.