Whole metagenome sequencing of cecum microbiomes in Ethiopian indigenous chickens from two different altitudes reveals antibiotic resistance genesOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
This study examined whole metagenome sequences of cecum microbiomes from Ethiopian indigenous chickens raised at two different altitudes. Researchers compared microbial community composition, functional gene pathways, and antibiotic resistance gene abundance between the two locations. Functional profiling used the KEGG, eggNOG, and CAZy databases, and taxonomic differences were identified using LEfSe.
Who was studied?
The subjects were Ethiopian indigenous chickens sampled from two distinct geographical zones: the Afar district (Dulecha, 730 meters above sea level) and the Amhara district (Menz Gera Midir, 3300 meters above sea level). The abstract does not give an exact number of birds sampled, so the cohort is best described as cecum microbiome samples drawn from these two altitude-defined chicken populations.
What were the most important findings?
Cecum microbial populations in both groups were mainly dominated by Bacteroidetes and Firmicutes, and the two groups shared 2210 common genes. Coprobacter, Geobacter, Cronobacter, Alloprevotella, and Dysgonomonas were more abundant in the low-altitude Afar chickens than in the high-altitude Amhara chickens. Functional pathway analysis showed enrichment in metabolism, genetic information processing, environmental information processing, and cellular process categories, and this functional abundance was linked to nutrient absorption and microbial localization. Antibiotic resistance genes for LSM, cephalosporin, and tetracycline were significantly more abundant in the Afar (low-altitude) group than in the Amhara (high-altitude) group.
What are the greatest implications of this study?
The findings suggest that altitude and geographic location are associated with meaningful shifts in gut microbial composition, function, and antibiotic resistance gene burden in indigenous chickens. The higher abundance of resistance genes at lower altitude raises questions about environmental or management factors that could influence antibiotic resistance in poultry gut microbiomes. These results provide a baseline for understanding how environment shapes microbiome-linked traits relevant to poultry health and food safety in indigenous chicken populations.