Optimizing Genomic DNA Extraction from Avian Feathers: A Modified Phenol-Chloroform Approach for Enhanced Efficiency...

The procurement of blood and tissue samples for DNA extraction in avian species intended for molecular studies is associated with the induction of discomfort and pain in the subjects, compounded by practical challenges in application and ethical considerations. Consequently, feathers have emerged as a more prevalent source for molecular investigations, particularly in the fields of poultry and ornithology. However, the effective extraction of DNA from feathers necessitates the breakdown of the hard keratinized tissue within the feather structure. This study aimed to devise a highly efficient, cost-effective, and easily adaptable Modified Phenol-Chloroform (MPC) approach for genomic DNA extraction from feathers, addressing shortcomings identified in previous studies on feather-based DNA isolation. The MPC method was employed to extract genomic DNA from feather samples obtained from six distinct avian species (chicken, guinea fowl, canary, pigeon, emu, and goose). Comparative evaluation of DNA isolation efficiency was conducted by employing two different commercial DNA kits alongside the MPC method. The results showed significantly higher DNA concentrations (ng/ml) from chicken feathers using the MPC method compared to those obtained with commercial kits (p < 0.05), along with high DNA purity (1.83 ± 0.11). Subsequent PCR experiments, employing nuclear and mitochondrial DNA-specific primers, illustrated the effective amplification of short and long fragments from MPC-isolated DNA samples. In contrast to commercial kits, the findings underscore the successful application of the MPC method in isolating high-quality genomic DNA from feathers characterized by elevated keratin content.