Genetic Analysis of Ventricular Arrhythmia in Young German Shepherd Dogs
| Autor: | Teresa M. Gunn, Jenifer Cruickshank, J. Li, R.L. Quaas, Shari A. Hemsley, N S Moise |
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| Rok vydání: | 2009 |
| Předmět: |
Male
Tachycardia medicine.medical_specialty Pediatrics Genetic correlation Genetic analysis Sudden death Dogs Internal medicine medicine Animals Genetic Predisposition to Disease Dog Diseases Prospective Studies Age of Onset Prospective cohort study Ultrasonography Models Genetic General Veterinary medicine.diagnostic_test business.industry Case-control study Arrhythmias Cardiac Pedigree Case-Control Studies Electrocardiography Ambulatory Cardiology Female Age of onset medicine.symptom business Electrocardiography |
| Zdroj: | Journal of Veterinary Internal Medicine. 23:264-270 |
| ISSN: | 1939-1676 0891-6640 |
| DOI: | 10.1111/j.1939-1676.2009.0265.x |
| Popis: | Background: Ventricular arrhythmias (VA) and sudden death are inherited in German Shepherd Dogs (GSDs). Objectives: To estimate the genetic parameters (heritabilities and correlations) of 3 traits of VA (single premature ventricular complexes (PVCs), 2 consecutive PVCs (couplets), and 3 or more consecutive PVCs—ventricular tachycardia [VT]). Animals: Three hundred and ninety-eight GSDs. Methods: Prospective, observational, case control study. Dogs were phenotyped by 24-hour ambulatory ECG from 6 to 45 weeks of age. Edited ECG records included the number of incidents of (1) single PVCs, (2) couplets, and (3) VT. Results: A data set of 1,239 Holter records from 398 GSDs was used to estimate genetic variables. Phenotypic correlations for affectedness (binarily coded 0/1) of the 3 traits ranged from 0.55 to 0.74, whereas correlations for severity (continuous values of 24-hour VA counts) ranged from 0.26 to 0.39. Estimates of genetic correlation among the severity traits were 0.06 to 0.27. Estimated heritabilities were 0.54, 0.54, and 0.46 for affectedness and 0.33, 0.69, and 0.69 for severity of PVCs, couplets, and VT, respectively. Month and year of birth and age at ECG recording had significant effects on all 3 traits. Season of ECG recording had a significant effect on the number of single PVCs, but not couplets or incidents of VT. Age of onset differed, with single PVCs appearing an average of 4 days earlier than couplets and VT. Conclusion: These results imply a strong genetic component for this disease but suggest that differences in the 3 traits should be taken into consideration in studies to identify the underlying genes. |
| Databáze: | OpenAIRE |
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