Identification of gene locus polymorphism involved in heat stress ‎‎(HSP90β) in Marandi indigenous and commercial chickens‎

Heat stress causes significant economic losses in poultry production and leads to the reduction of several physiological and metabolic factors. This research was conducted in order to investigate the allelic and genotypic polymorphisms of the gene involved in heat stress (HSP90β) in Marandi indigenous, broiler and laying chickens using PCR-RFLP technique. Randomly, blood was taken from 300 chicken and genomic DNA was extracted by salting out method. Amplification of the desired gene locus with a length of 494 bp was performed using specific primers and MspI enzyme was used to identify the mutation in the desired gene locus. After enzymatic digestion, two genotypes M1M1 and M1M2 and two alleles M1 (with a band of 494 bp) and M2 (with two bands of 248 bp and 246 bp) were identified for the HSP90β marker locus. Marandi indigenous and broiler chicken masses were in the Hardy-Weinberg equilibrium. For Marandi indigenous and broiler chicken populations, the Shannon information index at the HSP90β marker locus was 0.25 and 0.40, the fixation index is -0.07 and -0.16, and the observed heterozygosity index was 0.14 and 0.28, respectively. Due to the presence of polymorphism and mutation in the studied gene locus, it can be used in the Marandi indigenous and broiler chickens by genetic selection with the help of this marker to eliminate heat-sensitive chickens and keep heat-resistant chickens.