Single Nucleotide Polymorphisms in IL8 and TLR4 Genes as Candidates for Digital Dermatitis Resistance/Susceptibility in Holstein Cattle.
Relatedness between single nucleotide polymorphisms in IL8 and TLR4 genes and digital dermatitis resistance/susceptibility was investigated in seventy Holstein dairy cows. Animals were assigned into two groups, affected group (n = 35) and resistant group (n = 35) based on clinical signs and previous history of farm clinical records. Blood samples were collected for DNA extraction to ampliy fragments of 267-bp and 382-bp for IL8 and TLR4 genes, respectively. PCR-DNA sequencing revealed three SNPs in each of IL8 and TLR4 genes. The identified SNPs associated with digital dermatitis resistance were C94T, A220G, and T262A for IL8 and C118T for TLR4. However, the G349C and C355A SNPs in TLR4 gene were associated with digital dermatitis susceptibility. Chi-square analysis for comparison the distribution of all identified SNPs in both IL8 and TLR4 genes between resistant and affected animals showed no significant variation among the identified SNPs in IL8 gene. Meanwhile, there was a significant variation in case of TLR4 gene. As a pilot study, the present results revealed that identified SNPs in IL8 and TLR4 genes can be used as a genetic marker and predisposing factor for resistance/susceptibility to digital dermatitis in dairy cows. However, TLR4 gene may be a potential candidate for such disease.
a Department of Surgery, Anesthesiology and Radiology, Faculty of Veterinary Medicine , Mansoura University , Mansoura , Egypt.
El-Sayed
ES
El-Shafaey
b Department of Animal Husbandry and Animal Wealth Development, Faculty of Veterinary Medicine , Mansoura University , Mansoura , Egypt.
Ahmed
A
Ateya
c Department of Hygiene and Zoonoses, Faculty of Veterinary Medicine , Mansoura University , Mansoura , Egypt.
Hazem
H
Ramadan
d Department of Animal Physiology, Faculty of Veterinary Medicine , Mansoura University , Mansoura , Egypt.
Rasha
R
Saleh
d Department of Animal Physiology, Faculty of Veterinary Medicine , Mansoura University , Mansoura , Egypt.
Yousef
Y
Elseady
b Department of Animal Husbandry and Animal Wealth Development, Faculty of Veterinary Medicine , Mansoura University , Mansoura , Egypt.
Eman
E
Abo El Fadl
e Department of Internal Medicine and Infectious Diseases, Faculty of Veterinary Medicine , Mansoura University , Mansoura , Egypt.
Sabry
S
El-Khodery
D000818:Animals; D002417:Cattle / Q000235:genetics*; D002418:Cattle Diseases / Q000235:genetics*; D058066:Digital Dermatitis / Q000235:genetics*; D005260:Female; D056726:Genetic Association Studies; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D016209:Interleukin-8 / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D051197:Toll-Like Receptor 4 / Q000235:genetics*
D016209:Interleukin-8; D051197:Toll-Like Receptor 4
DNA sequencing; Digital dermatitis; Holstein cattle; IL8; TLR4; gene polymorphisms