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Reference genes for quantitative gene expression studies in multiple avian species.

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A new pan-avian primer set enables accurate gene expression analysis across diverse bird species. This validated set identifies stable reference genes, crucial for reliable molecular research in ornithology.

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Area of Science:

  • Molecular Biology
  • Ornithology
  • Genomics

Background:

  • Quantitative real-time PCR (qPCR) is vital for gene expression analysis.
  • Accurate normalization relies on selecting suitable reference genes.
  • Expanding molecular studies in avian species necessitates validated pan-avian reference gene primers.

Purpose of the Study:

  • To test a pan-avian primer set for 14 candidate reference genes across nine diverse avian species.
  • To identify stably expressed reference genes for accurate gene expression normalization in multiple bird species.
  • To validate reference gene suitability in the context of singing behavior in zebra finches.

Main Methods:

  • A set of 14 candidate reference gene primers was tested on tissues from mallard, chicken, crane, eagle, turkey, cockatiel, penguin, ostrich, and zebra finch.
  • Primer pairs were established for 6-11 genes per species.
  • Gene expression levels of 10 candidate reference genes, FOXP2, EGR1, and CFOS were analyzed in zebra finch Area X using RNA from singing and silent birds.
  • Three statistical algorithms were employed to identify stably expressed genes.

Main Results:

  • Primer pairs for 6-11 candidate reference genes were successfully established for each of the nine avian species.
  • Five genes (18S, PGK1, RPS7, TFRC, YWHAZ) demonstrated stable expression across tissues and experimental conditions (singing vs. silent) in zebra finches.
  • These five genes are validated as suitable reference genes for normalization in avian gene expression studies.

Conclusions:

  • The developed pan-avian primer set is effective for normalizing gene expression across multiple avian species.
  • The identified reference genes (18S, PGK1, RPS7, TFRC, YWHAZ) provide a reliable basis for accurate gene expression quantification in avian research.
  • This resource facilitates robust molecular investigations in a wide range of bird species.