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Parentage Analysis And Breed Characterization Of Dogs By Microsatellite Markers

By: Muhammad Sajid Tahir | 5/31/2010.
Contributor(s): Mr.Tanveer Hussain | Mrs.Saeeda.
Material type: materialTypeLabelBookPublisher: 1990Subject(s): Institute of Biochemistry & BiotechnologyDDC classification: 1090,T Dissertation note: Pakistan has vast population of dogs belonging to different breeds. Most of the dogs have no pedigree record which is a great threat to conservation of different breeds. No study on DNA fingerprinting of dogs has been conducted in Pakistan. DNA fingerprinting of dogs is necessary to overcome the problems like forensic cases, sale & purchase, individual identity in case of fertilization by more than one male and ownership disputes. Microsatellite markers have been proved as an efficient and powerful tool for parentage testing and breed characterization of dogs. In this study, a panel of microsatellite markers, having high polymorphism information content (PlC) values, was developed. Blood samples were taken from cephalic vein of two breeds of dogs (German shepherd and Labrador retriever). DNA was extracted by Inorganic method. Primers of microsatellite markers were optimized for successful amplification conditions in the Bio-Rad thermocycler. Multiplex PCR was performed, for amplification of these microsatellite markers on 46 samples belonging to 20 families. Genotyping analysis was performed for the PCR products of microsatellite markers on non denaturing polyacrylamide gel. These results were analyzed statistically software "POPGENE 3.3 and POWER STAT". Allele frequency, heterozygosity, homozygosity, polymorphism information content (PlC), power of discrimination and power of exclusion of all microsatellite markers were calculated. Average power of discrimination among non parents, average hetrozygosity, average observed homozygosity and average polymorphism information content (PlC) value for all alleles was 0.809, 0.6345, 0.2913 and 0.724 respectively. Moreover combined power of exclusion reached a significant value of 0.9998. Almost all of the microsatellite markers showed significant variations in both German shepherd and Labrador retriever breeds. Microsatellite "REN41D2Ob" showed maximum variation i.e. 17 alleles and microsatellite"REN49F22b" showed the least variation among all microsatellite markers i.e. 4 alleles. Genotyping results of microsatellite markers were clearly different for two different breeds showing a distinct genetic distance between German shepherd and Labrador retriever breeds. Results of this study lead to development of a panel of microsatellite markers which can be used for parentage analysis and breed characterization of dogs. This was a preliminary study on dogs in Pakistan. This facility can be provided on commercial basis to pet owners and kennel clubs. Moreover this study can become the basis for further research investigations in canines in Pakistan.
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Pakistan has vast population of dogs belonging to different breeds. Most of the dogs have no pedigree record which is a great threat to conservation of different breeds. No study on DNA fingerprinting of dogs has been conducted in Pakistan. DNA fingerprinting of dogs is necessary to overcome the problems like forensic cases, sale & purchase, individual identity in case of fertilization by more than one male and ownership disputes. Microsatellite markers have been proved as an efficient and powerful tool for parentage testing and breed characterization of dogs. In this study, a panel of microsatellite markers, having high polymorphism information content (PlC) values, was developed. Blood samples were taken from cephalic vein of two breeds of dogs (German shepherd and Labrador retriever). DNA was extracted by Inorganic method. Primers of microsatellite markers were optimized for successful amplification conditions in the Bio-Rad thermocycler. Multiplex PCR was performed, for amplification of these microsatellite markers on 46 samples belonging to 20 families. Genotyping analysis was performed for the PCR products of microsatellite markers on non denaturing polyacrylamide gel. These results were analyzed statistically software "POPGENE 3.3 and POWER STAT". Allele frequency, heterozygosity, homozygosity, polymorphism information content (PlC), power of discrimination and power of exclusion of all microsatellite markers were calculated. Average power of discrimination among non parents, average hetrozygosity, average observed homozygosity and average polymorphism information content (PlC) value for all alleles was 0.809, 0.6345, 0.2913 and 0.724 respectively. Moreover combined power of exclusion reached a significant value of 0.9998. Almost all of the microsatellite markers showed significant variations in both German shepherd and Labrador retriever breeds. Microsatellite "REN41D2Ob" showed maximum variation i.e. 17 alleles and microsatellite"REN49F22b" showed the least variation among all microsatellite markers i.e. 4 alleles. Genotyping results of microsatellite markers were clearly different for two different breeds showing a distinct genetic distance between German shepherd and Labrador retriever breeds.

Results of this study lead to development of a panel of microsatellite markers which can be used for parentage analysis and breed characterization of dogs. This was a preliminary study on dogs in Pakistan. This facility can be provided on commercial basis to pet owners and kennel clubs. Moreover this study can become the basis for further research investigations in canines in Pakistan.

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