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DRIVERS OF VARIATION OF THE ZEBRAFISH EGG MICROBIOME.

Caitlin Smith1, Karen Adair1, Brendan J M Bohannan1

  • 1Institute of Ecology and Evolution, Department of Biology, University of Oregon, Eugene, OR, USA.

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Zebrafish egg microbiomes change significantly from fertilization to hatching. Parentage influences early microbial communities, with parents potentially serving as a key source of symbionts for offspring.

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Area of Science:

  • Developmental Biology
  • Microbiome Research
  • Animal Model Studies

Background:

  • The early-life microbiome is crucial for animal health, but its assembly drivers remain poorly understood.
  • Studies in non-model organisms often confound host genetics and environmental influences on microbiome development.

Purpose of the Study:

  • To investigate the primary drivers of early-life microbiome assembly in zebrafish (Danio rerio).
  • To analyze the influence of development stage and parentage on the zebrafish egg microbiome.

Main Methods:

  • 16S rRNA gene sequencing was used to profile the egg microbiome of 124 zebrafish individuals.
  • Microbiome composition was analyzed from fertilization through hatching, considering development stage and clutch origin.

Main Results:

  • Phylogenetic diversity of the egg microbiome decreased during development, indicating environmental filtering.
  • Parentage significantly impacted microbiome similarity within clutches, though this effect diminished over time.
  • The egg microbiome composition shifted dramatically during development.

Conclusions:

  • Parental influence is an important initial source of microbial symbionts for zebrafish offspring.
  • The developing egg environment plays a significant role in shaping microbiome variation.
  • Understanding early microbiome assembly is critical for animal health and development.