Evolutionary relationships of Red Jungle Fowl and chicken breeds

Published results were reassessed and original data are provided regarding the origin and relatedness of four postulated chicken breed lineages, egg-type, game, meat-type and Bantam, to each other and to the basic ancestral species of jungle fowls, Gallus gallus. A system approach was employed concerning the planning of the experiments. One element of the system approach is the choice of the breeds to be compared with G. gallus. These breeds were supposed to represent major evolutionary branches of chickens. Four experiments on genetic relationships were conducted using different estimation criteria including morphological discrete characters, body measurements, biochemical markers, and the activity of serum esterase-1. The greatest similarity was found between G. gallus and the egg-type breeds of Mediterranean roots and/or true Bantams. This fact might testify that the indicated chicken groups occupied earlier stages in the evolution from the wild progenitor to the present biodiversity of chickens in the world

Genetic diversity of Hajar1 and Hajar2 local Saudi chicken lines using mitochondrial DNA D-loop markers

This study was conducted to assess genetic diversity of Hajar1 and Hajar2 local Saudi chicken lines using mitochondrial DNA (mtDNA) D-loop partial sequences. One hundred blood samples were obtained equally from Hajar1 and Hajar2 Saudi chicken lines as 50 samples from each line. The D-loop region was partially amplified from genomic DNA with a conserved primer set, and the fragments were sequenced. Eight published reference mtDNA sequence data from the GenBank were used for comparisons, and multiple alignments were performed. The most common haplotype was assigned as a basic sequence for comparing within each line. Entropy plot and conserved region analysis were performed. Genetic distances and neighbour-joining (NJ) phylogenetic trees were estimated. The results indicated haplotype variations within and between local Saudi chicken lines, which could explain the phenotypic variation reported earlier. A close genetic relationship was shown between the Saudi local chicken lines. Unique conserved regions and nucleotide substitutions were observed between the two lines. Both lines have a close relationship with the reference Asian local chicken population, especially local Chinese and Indian chicken breeds. The current results are considered the first report of mtDNA sequence diversity for Hajar1 and Hajar2 lines. Further detailed molecular genetic studies of both lines are indispensable to genetic conservation and development.Keywords: chicken population, diversity, D-loop, Hajar1, Hajar2, mtDN

Molecular Characterization of Indonesian Indigenous Chickens based on Mitochondrial DNA Displacement (D)-loop Sequences

The Mitochondrial DNA (mtDNA) displacement (D)-loop sequences were used to study the genetic diversity and relationship of Indonesian indigenous chickens. A total of 483 individuals belonging to 15 population breeds and 43 individuals belonging to 6 populations of jungle fowl (2 populations of Gallus gallus and 4 populations of Gallus varius) were sampled. The hypervariable I (HVI) segment of the D-loop was PCR amplified and subsequently sequenced. The sequences of the first 397 nucleotides were used for analysis. Sixty nine haplotypes were identified from 54 polymorphic sites with polymorphism between nucleotides 167 and 397 contributing to 94.5% of the sequence variation. Phylogenetic analysis indicates that Indonesian indigenous chickens can be grouped into five distinct clades (clade I, II, IIIc, IIId, and IV) of the previously identified seven clades (clade I, II, IIIa, IIIb, IIIc, IIId, and IV) in Asian indigenous chickens. Fifty haplotypes belong to clade II, seven haplotypes are in clade IV, six are in clade IIId, three are in clade I and one haploype is in clade IIIc. There was no breed-specific clade. Analysis of Molecular Variance (AMOVA) based on partial D-loop sequences of Indonesian chicken indicates that 67.85% of the total sequence variation between haplotypes was present within the population and 32.15% between populations. One of the haplotypes (represented by PLC4) was shared by all populations, suggesting that these populations may share the same maternal ancestor. These results show a high mitochondrial D-loop diversity and indicate multiple maternal origins for Indonesian indigenous chickens. Key words: Indonesian indigenous chicken, mitochondrial DNA, D-loop, haplotype, phylogenetic analysis and clad

Analysis of genetic relationship among Indonesian native chicken breeds based on 335 D-loop sequences

The Mitochondrial DNA (mtDNA) D-loop segment was PCR amplified and subsequently sequenced for a total of 335 individuals from Indonesian native chicken. The individuals were drawn from sixteen populations of native chicken and three individuals of green jungle fowls (Gallus varius). Indonesian native chicken populations were: Pelung Sembawa, PL (n = 18), Pelung Cianjur, PLC (n = 29) and Arab Silver, ARS (n=30), Cemani, CM (n = 32), Gaok, GA (n = 7), Kedu Hitam, KDH (n = 11), Wareng, T TW (n = 10), Cemani, CMP (n = 2), Kedu, KD (n=26), Kedu Putih, KDP (n = 15), Sentul Jatiwangi, STJ (n = 27), Ayam Kate, KT (n = 29), Ayam Sentul, STC (n = 15), Arab Golden, ARG (n = 26), Ayam Merawang, MR (n = 28), Kedu Putih Jatiwangi, KDPJ (n=6) and Kapas, KPS (n = 21). Green jungle fowls were: two individuals from Flores island (FL5 and FL57) and one individual (BD42) from Sumbawa island. The sequences of the first 530 nucleotides were used for analysis. Eighty two haplotypes were identified from 78 polymorphic sites for the 335 individuals. Seventy nine haplotypes were identified in native chicken from 57 polymorphic sites while three were of jungle fowls. Phylogenetic analysis indicates that Indonesian native chicken can be grouped into five clades (Clade I, II, IIIc, IIId and IV) of the previously identified seven clades (Clade I, II, IIIa, IIIb, IIIc, IIId and IV) in Asian domestic chicken. Haplotypes CM10 and CM32 fall to a different category while STC12 is also on its own. Interestingly STC12 clusters together with Gallus gallus gallus (GenBank accession No. SULANDARI et al. Analysis of genetic relationship among Indonesian native chicken breeds based on 335 D-loop sequences 296 AB007720). When CM10 (same as CM14), CM32 and STC12 were removed, 77 haplotypes of domestic chicken were identified from 53 polymorphic sites. All the green jungle fowls are clustered to one clade of their own. The clades of domestic chicken are: Clade I which has three haplotypes, Clade II has 52 haplotypes, Clade IIIc has one haplotype (represented by ARS30), Clade IIId has nine haplotypes while Clade IV has eleven haplotypes. The phylogenetic relationship between chicken populations has no link to the geographic locations. Analysis of molecular variance showed that the genetic variation within populations was 67.42% while 32.58% accounted for the genetic differentiation between populations. Key Words: Native Chiken, Green Jungle Fowls, D-Loop DNA Mitochondria, HV-1, Clade, Haplotype, Phylogenetic, Genetic Variatio

Molecular genetic approaches on cattle and chicken breeding: A Review

In recent years, the application of molecular genetic methods and techniques has made a significant contribution in various fields, including animal husbandry. Traditional approaches to livestock breeding have gained new insights from molecular genetics, resulting in increased efficiency and optimization of breeding programs. Genome selection has emerged as a revolutionary technique, enabling comprehensive selection at the early stages of breeding. Moreover, the manipulation of economically important candidate genes at the cellular level contributes to future advances in livestock breeding. In cattle, the integration of gene editing into breeding programs is considered a tool for genetic modification, with particular emphasis on its potential implications across sectors and regions. Numerous studies on the use of genes as the basis for breeding chickens have been conducted extensively. These studies can be categorized into several sections, such as disease resistance, physical performance, and physiological aspects. The significant contribution of molecular genetics to livestock breeding and genetic improvement still requires further research to capitalize on technological advances in this field. Keywords: Breeding, cattle, chicken, gene selection, molecular geneti