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Related Concept Videos

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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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Measuring Liver Mitochondrial Oxygen Consumption and Proton Leak Kinetics to Estimate Mitochondrial Respiration in Holstein Dairy Cattle
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Multi-tissue analysis identifies mitochondrial genes in chicken aging-induced productivity decline.

Mingyue Gao1,2, Junnan Zhang1,2, Boxuan Zhang1,2

  • 1State Key Laboratory of Animal Biotech Breeding, Frontier Science Center of Molecular Design Breeding, China Agricultural University, Beijing, 100193, China.

Journal of Animal Science and Biotechnology
|April 22, 2026
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Summary

This study identified key genes and molecular pathways, including mitochondrial and ribosomal dysfunction, linked to age-related production decline in laying hens. NDUFB9 was highlighted as a potential anti-aging target to improve poultry longevity.

Keywords:
Age-related genesChickenFunctional declineMitochondrial dysfunctionMulti-tissue RNA-seq

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Area of Science:

  • Poultry genetics and aging research
  • Molecular biology and transcriptomics
  • Animal science and agricultural biotechnology

Background:

  • Age-related decline in poultry production poses significant challenges for the industry.
  • Genetic factors influencing the prolonged laying cycle of hens are not well understood.
  • Identifying genes related to tissue functional decline is crucial for improving hen productivity.

Purpose of the Study:

  • To systematically identify key genes associated with age-related production decline in laying hens.
  • To reveal dynamic gene expression changes during tissue functional decline.
  • To uncover molecular mechanisms underlying reduced productivity in aging hens.

Main Methods:

  • Integrated multi-tissue transcriptomic data from 216 Rhode Island Red laying hens at three age points (50, 70, 100 weeks).
  • Analyzed gene expression across nine tissues (hypothalamus, pituitary, cecum, duodenum, liver, ovary, magnum, isthmus, uterus).
  • Utilized differential gene expression analysis, network analysis, and functional validation in a cellular senescence model.

Main Results:

  • Identified 87 genes with significant expression changes across all tissues and 20 hub genes involved in mitochondrial and ribosome functions.
  • Discovered 106 differentially expressed genes (DEGs) with tissue-specific patterns and interaction networks.
  • Screened 51 genes linked to both production decline and economically important traits, highlighting NDUFB9 as a potential anti-aging target.

Conclusions:

  • Established a multi-tissue transcriptomic framework for understanding aging-associated productivity decline in laying hens.
  • Revealed conserved mitochondrial and ribosomal dysfunction as key molecular features of age-related decline.
  • Identified NDUFB9 as a promising anti-aging target for enhancing poultry longevity and production performance.