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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
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In Ovo Intravascular Injection in Chicken Embryos
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Copy Number Variation and SNP Affect Egg Production in Chickens by Regulating AP2M1 Expression to Inhibit GnRH

Dandan Wang1, Yanchun Yu1, Yiqian Zhu1

  • 1College of Animal Science and Veterinary Medicine, Henan Institute of Science and Technology, Xinxiang 453003, China.

Animals : an Open Access Journal From MDPI
|October 29, 2025
PubMed
Summary

Researchers identified the adaptor related protein complex 2 mu 1 subunit (AP2M1) gene as a key factor in chicken egg production. Genetic variations in AP2M1, including copy number loss and specific SNPs, were linked to differences in egg laying, aiding molecular breeding strategies.

Keywords:
AP2M1GnRH regulationchickencopy number variation (CNV)egg productionsingle nucleotide polymorphism (SNP)

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Area of Science:

  • Animal Genetics
  • Molecular Biology
  • Reproductive Biology

Background:

  • Identifying genetic factors influencing chicken egg production is crucial for breeding programs.
  • The adaptor related protein complex 2 mu 1 subunit (AP2M1) gene was previously identified as a candidate gene for egg production.

Purpose of the Study:

  • To elucidate the function of the AP2M1 gene in chicken egg production.
  • To identify functional genetic variants regulating AP2M1 expression and its impact on egg laying.

Main Methods:

  • Analysis of AP2M1 gene expression in different chicken breeds and hypothalamic neuron cells.
  • Overexpression and interference assays to assess AP2M1's effect on GnRH.
  • Copy number variation (CNV) analysis and SNP association studies using qRT-PCR and whole-genome sequencing.
  • Dual-luciferase reporter assay to confirm functional SNPs.

Main Results:

  • Hypothalamic AP2M1 expression negatively correlates with egg production.
  • AP2M1 inhibits GnRH synthesis and secretion in chicken hypothalamic neurons.
  • A copy number loss of AP2M1 was observed in high-laying breeds.
  • Fifteen SNPs within AP2M1 were associated with egg production traits, with chr9:15994879T>C identified as a functional regulatory variant.

Conclusions:

  • AP2M1 plays an inhibitory role in chicken egg production, likely through GnRH regulation.
  • CNVs and specific SNPs in AP2M1 are key molecular markers influencing egg-laying performance.
  • These findings support the use of AP2M1 variants in molecular design breeding for enhanced chicken egg production.