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The objectives of this study are to identify specific functional genes which are related with growth and protein structure of the pectoral muscle of Korean native chicken. Pectoral muscle was isolated from three Korean native chickens (KNC, red brown, 12 months old, 2.41 ± 0.24 kg) and three Cornish chickens (16 month old, 2.76 ± 3.0 kg). The subtraction cDNA library was prepared in PCR4 Blunt-TOPO vector. The DNA sequence homology was compared with other breeds and species in GenBank. A clone NDS-81 was found to be unique for the DNA sequence homology with UBX family. Their partial sequence has high homology (98%) with chicken UBX domain D. Chicken UBX domain has chicken (93%), cattle (68%), dog (67%), mouse (64%) and, human (63%) nucleotide sequence homology. Several regions were mutated from T in chicken to C or G in the NDS-81 clone. The first site is LAD in chicken, but it was expressed as (L)RM in clone NDS-81. In this site, amino acids were changed from Ala to Arg, and from Asp to Met. The second site was changed from ER (Arg) in chicken to ED (Asp) in clone NDS-81. They are both containing functional side chains and play an important role in binding other proteins. Therefore, the clone NDS-81 could be a different candidate gene for the UBX family gene and could related with pectoral muscle structure of Korean native chicken.

Polymorphic Diversity of UBX Domain D from cDNA Isolated from Pectoral Muscle of Korean Native Chicken