article · Cameroon Journal of Biological and Biochemical Sciences
The avian myxovirus-resistance (Mx) gene produces an antiviral protein linked to immune responses against RNA viruses such as Newcastle disease virus. A pilot investigation examined genetic variation in exon 5 of this gene across 17 chickens representing five local and improved groups reared in Cameroon. Sequencing a 284-base-pair segment identified 56 variable nucleotide sites, including a tri-allelic variant at position 214. Genetic diversity differed across groups, showing higher levels in Brahma and Goliath chickens and lower diversity in Kabir and naked-neck chickens. Sequences generally clustered according to chicken group, with most genetic variation occurring between groups rather than within them. Because the research examined a single gene fragment across a small cohort without measuring disease responses, these genetic variants cannot yet serve as confirmed markers of viral resistance.
Newcastle disease virus poses a major threat to poultry production. Identifying genetic diversity in antiviral candidate genes like Mx is an essential first step toward discovering natural disease resistance in chickens. Understanding these genetic variations across local and improved poultry populations helps map existing diversity, which informs future breeding programmes aimed at improving flock resilience.
This research represents very early-stage genetic discovery with no immediate commercial application. The findings could eventually inform poultry breeders and livestock programmes developing genetic screening tools for selecting disease-resilient chickens. Realising this potential requires considerable further work, including full-gene sequencing across larger populations and direct disease-challenge testing to link specific genetic variants to actual virus resistance.
AI-generated from the published abstract. Always read the original work before citing.
ABSTRACT The avian myxovirus-resistance (Mx) gene encodes an interferon-inducible antiviral protein and has been investigated as a candidate locus in host responses to RNA viruses, including Newcastle disease virus (NDV). This pilot study characterised exon 5 sequence variation in 17 chickens reared in Cameroon from five local and improved chicken groups. Genomic DNA from blood was used to PCR-amplify a 284-bp exon 5 fragment, followed by Sanger sequencing. Alignment with White Leghorn and Rhode Island Red reference sequences identified 56 variable nucleotide positions, including a tri-allelic site at position 214. Several variants were fixed or nearly fixed within the sampled groups. Nucleotide diversity was higher in Brahma and Goliath and lower in Kabir and naked-neck chickens. Distance-based clustering and haplotype-network analysis grouped sequences by chicken group, and AMOVA attributed most observed variation to differences among groups rather than within groups. Thus, exon 5 of Mx was polymorphic, and its diversity was structured across this small sample. Because the study analysed only one gene fragment in 17 birds and did not measure NDV-response phenotypes, the detected variants cannot be interpreted as resistance markers. Broader sampling, full-gene sequencing and direct disease-related phenotyping are required to assess their biological and breeding relevance. Keywords: Mx gene, exon 5, SNP polymorphism, Newcastle disease virus, genetic diversity.
This page summarises published work. The authoritative version sits with the publisher.
DOI: 10.63342/cjbbs2026.34.010.en
Is something wrong with this record? Report it or request removal.
Discussion
Have you built on this work, tried to replicate it, or seen it applied in practice? Share what you know. Verified researchers and MARATTO™ domain experts can open a discussion, and any member can reply. Contributions are reviewed before they appear.
No discussion yet. Open the first thread.
New to MARATTO™? Create a free account.
