Browsing by Subject "DYNEIN REGULATORY COMPLEX"

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  • Iso-Touru, Terhi; Wurmser, Christine; Venhoranta, Heli; Hiltpold, Maya; Savolainen, Tujia; Sironen, Anu; Fischer, Konrad; Flisikowski, Krzysztof; Fries, Ruedi; Vicente-Carrillo, Alejandro; Alvarez-Rodriguez, Manuel; Nagy, Szabolcs; Mutikainen, Mervi; Peippo, Jaana; Taponen, Juhani; Sahana, Goutam; Guldbrandtsen, Bernt; Simonen, Henri; Rodriguez-Martinez, Heriberto; Andersson, Magnus; Pausch, Hubert (2019)
    Background: Cattle populations are highly amenable to the genetic mapping of male reproductive traits because longitudinal data on ejaculate quality and dense microarray-derived genotypes are available for thousands of artificial insemination bulls. Two young Nordic Red bulls delivered sperm with low progressive motility (i.e., asthenospermia) during a semen collection period of more than four months. The bulls were related through a common ancestor on both their paternal and maternal ancestry. Thus, a recessive mode of inheritance of asthenospermia was suspected. Results: Both bulls were genotyped at 54,001 SNPs using the Illumina BovineSNP50 Bead chip. A scan for autozygosity revealed that they were identical by descent for a 2.98Mb segment located on bovine chromosome 25. This haplotype was not found in the homozygous state in 8557 fertile bulls although five homozygous haplotype carriers were expected (P=0.018). Whole genome-sequencing uncovered that both asthenospermic bulls were homozygous for a mutation that disrupts a canonical 5 splice donor site of CCDC189 encoding the coiled-coil domain containing protein 189. Transcription analysis showed that the derived allele activates a cryptic splice site resulting in a frameshift and premature termination of translation. The mutated CCDC189 protein is truncated by more than 40%, thus lacking the flagellar C1a complex subunit C1a-32 that is supposed to modulate the physiological movement of the sperm flagella. The mutant allele occurs at a frequency of 2.5% in Nordic Red cattle. Conclusions; Our study in cattle uncovered that CCDC189 is required for physiological movement of sperm flagella thus enabling active progression of spermatozoa and fertilization. A direct gene test may be implemented to monitor the asthenospermia-associated allele and prevent the birth of homozygous bulls that are infertile. Our results have been integrated in the Online Mendelian Inheritance in Animals (OMIA) database (https://omia.org/OMIA002167/9913/).
  • Anderegg, Linda; Im Hof Gut, Michelle; Hetzel, Udo; Howerth, Elizabeth W.; Leuthard, Fabienne; Kyöstilä, Kaisa; Lohi, Hannes; Pettitt, Louise; Mellersh, Cathryn; Minor, Katie M.; Mickelson, James R.; Batcher, Kevin; Bannasch, Danika; Jagannathan, Vidhya; Leeb, Tosso (2019)
    Author summary Motile cilia are required for clearing mucous, infectious agents and inhaled dust from the airways. Primary ciliary dyskinesia (PCD) is a hereditary defect of motile cilia. Clinical findings may include recurrent airway infections, fertility problems, and sometimes hydrocephalus. We analyzed an Alaskan Malamute family, in which two out of six puppies were affected by an autosomal recessive form of PCD. Whole genome sequencing of an affected dog identified a one base pair deletion in the NME5 gene, c.43delA, leading to an early frame-shift and premature stop codon. Later in the study, we became aware of a previously published Alaskan Malamute with PCD involving respiratory infections and hydrocephalus. We observed perfect concordance of the NME5 genotypes with the PCD phenotype in all three affected Alaskan Malamutes and more than 1000 controls. The fact that the third case, which had no documented close relationship to the initial two cases, was homozygous for the same rare mutant NME5 allele, strongly supports our hypothesis that NME5:c.43delA causes the PCD phenotype. We confirmed absence of NME5 protein expression in nasal epithelium of an affected dog. Our results enable genetic testing in dogs and identify NME5 as novel candidate gene for unsolved human PCD cases.