Abstract
Aim:An attempt has been made to study the toll-like receptors 4 (TLR4) gene polymorphism from cattle DNA to correlate with mastitis cows.Materials and Methods:In present investigation, two fragments of TLR4 gene named T4CRBR1 and T4CRBR2 of a 316 bp and 382 bp were amplified by polymerase chain reaction (PCR), respectively from Kankrej (22) and Triple cross (24) cattle. The genetic polymorphisms in the two populations were detected by a single-strand conformational polymorphism in the first locus and by digesting the fragments with restriction endonuclease Alu I in the second one.Results:Results showed that both alleles (A and B) of two loci were found in all the two populations and the value of polymorphism information content indicated that these were highly polymorphic. Statistical results of χ2 test indicated that two polymorphism sites in the two populations fit with Hardy–Weinberg equilibrium (p<0.05). Meanwhile, the effect of polymorphism of TLR4 gene on the somatic cell score (SCS) indicated the cattle with allele a in T4CRBR1 showed lower SCS than that of allele B (p<0.05). Thus, the allele A might play an important role in mastitis resistance in cows.Conclusion:The relationship between the bovine mastitis trait and the polymorphism of TLR4 gene indicated that the bovine TLR4 gene may play an important role in mastitis resistance.
Highlights
Mastitis is defined as an inflammatory reaction of the parenchyma of the mammary glands to bacterial, chemical, thermal or mechanical injury regardless of the cause and is characterized by a range of physical, chemical and usually bacteriological changes in the milk and pathological changes in the glandular tissue
The relationship between the bovine mastitis trait and the polymorphism of toll-like receptors 4 (TLR4) gene indicated that the bovine TLR4 gene may play an important role in mastitis resistance
The genetic polymorphisms for the two populations in the locus T4CRBR1 was detected by single-strand conformational polymorphism (SSCP) (Figure-1) and the polymorphisms of T4CRBR2 were detected by RFLP (Figure-2)
Summary
Mastitis is defined as an inflammatory reaction of the parenchyma of the mammary glands to bacterial, chemical, thermal or mechanical injury regardless of the cause and is characterized by a range of physical, chemical and usually bacteriological changes in the milk and pathological changes in the glandular tissue. High somatic cell count (SCC) levels in a herd are usually a sign of high levels of subclinical mastitis. The most significant abnormality of the milk in subclinical mastitis is the increase in the SCC [1]. The increased leukocyte count is, in almost all cases, a reaction of tissue injury and is preceded by changes in the milk which are the direct result of damage to the tissue [2].
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