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Related Experiment Video

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Genotyping blastoderms of avian eggs.

Kim Teltscher1, Bart Kempenaers1

  • 1Department of Ornithology Max Planck Institute for Biological Intelligence Seewiesen Germany.

Ecology and Evolution
|December 15, 2023
PubMed
Summary

Undeveloped bird eggs, often discarded, can yield valuable genetic data. A new method allows DNA extraction for genotyping and fertilization status, while preserving sperm counts for research on early embryo mortality.

Keywords:
birdsgenotypinginfertile eggssexingspermundeveloped eggs

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Area of Science:

  • Avian reproductive biology
  • Molecular ecology
  • Conservation genetics

Background:

  • Undeveloped bird eggs are frequently discarded, presumed infertile.
  • These eggs may contain crucial data on fertilization, paternity, and inbreeding.
  • Investigating early embryo mortality requires reliable methods for analyzing undeveloped eggs.

Purpose of the Study:

  • To present a novel technique for DNA extraction from undeveloped avian eggs.
  • To enable accurate genotyping and fertilization status determination.
  • To facilitate sperm analysis from the perivitelline layer (PVL).

Main Methods:

  • A simple method to extract embryo cells from the blastoderm for DNA analysis.
  • Preservation of the perivitelline layer (PVL) for sperm counts.
  • Application of the technique to 707 blue tit (Cyanistes caeruleus) eggs, including fresh, abandoned, and unhatched samples.
  • DNA extraction using a Qiagen kit and genotyping with 14 microsatellite and 1 sexing marker.

Main Results:

  • Successful DNA genotyping in 97% of all sampled undeveloped eggs.
  • Demonstrated reliability of the method on both fresh and deteriorated egg material.
  • Validation of the technique for ascertaining fertilization status and offspring sex.
  • Successful retention of the PVL for sperm and embryo cell observations.

Conclusions:

  • The described method reliably genotypes undeveloped avian eggs, even from deteriorated samples.
  • This technique provides a powerful tool for studying reproductive patterns and causes of early embryo loss.
  • It offers insights into paternity, inbreeding, and fertilization success in wild bird populations.