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Deletion variant near ZNF 389 is associated with control of ovine lentivirus in multiple sheep flocks
Author(s) -
White S. N.,
Mousel M. R.,
Reynolds J. O.,
HerrmannHoesing L. M.,
Knowles D. P.
Publication year - 2014
Publication title -
animal genetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.756
H-Index - 81
eISSN - 1365-2052
pISSN - 0268-9146
DOI - 10.1111/age.12107
Subject(s) - biology , flock , genotype , haplotype , mastitis , breed , lentivirus , virology , genetics , gene , immunology , virus , viral disease , paleontology , microbiology and biotechnology
Summary Ovine lentivirus ( O v LV ) is a macrophage‐tropic lentivirus found in many countries that causes interstitial pneumonia, mastitis, arthritis and cachexia in sheep. There is no preventive vaccine and no cure, but breed differences suggest marker‐assisted selective breeding might improve odds of infection and control of O v LV post‐infection. Although variants in TMEM 154 have consistent association with odds of infection, no variant in any gene has been associated with host control of O v LV post‐infection in multiple animal sets. Proviral concentration is a live‐animal diagnostic measure of O v LV control post‐infection related to severity of O v LV ‐induced lesions. A recent genome‐wide association study identified a region including four zinc finger genes associated with proviral concentration in one R ambouillet flock. To refine this region, we tested additional variants and identified a small insertion/deletion variant near ZNF 389 that showed consistent association with proviral concentration in three animal sets ( P < 0.05). These animal sets contained R ambouillet, P olypay and crossbred sheep from multiple locations and management conditions. Strikingly, one flock had exceptionally high prevalence (>87%, including yearlings) and mean proviral concentration (>950 copies/μg), possibly due to needle sharing. The best estimate of proviral concentration by genotype, obtained from all 1310 O v LV ‐positive animals tested, showed insertion homozygotes had less than half the proviral concentration of other genotypes ( P < 0.0001). Future work will test additional breeds, management conditions and viral subtypes, and identify functional properties of the haplotype this deletion variant tracks. To our knowledge, this is the first genetic variant consistently associated with host control of O v LV post‐infection in multiple sheep flocks.