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Efficient Production and Identification of CRISPR/Cas9-generated Gene Knockouts in the Model System Danio rerio
Published on: August 28, 2018
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Conserved germ plasm characteristics across the Danio and Devario lineages
Christina L Hansen1, Trevor J Chamberlain1, Ryan L Trevena1
1Laboratory of Genetics, University of Wisconsin - Madison, Madison, Wisconsin, USA.
Genesis (New York, N.Y. : 2000)
|October 7, 2021
Summary
Germ plasm RNA components are largely conserved in closely related Danionin fish species, ensuring germ cell specification. However, some RNA components show divergence, indicating evolutionary changes in germ plasm composition.
Area of Science:
- Developmental Biology
- Evolutionary Biology
- Genetics
Background:
- Germ cell specification relies on germ plasm, a maternal RNA and protein condensate.
- Studies often use evolutionarily divergent model organisms, limiting understanding of closely related species.
- Zebrafish germ plasm contains 12 localized RNAs essential for early embryonic development.
Purpose of the Study:
- To investigate the conservation of zebrafish germ plasm RNAs in three related Danionin species.
- To determine if germ plasm segregation patterns are conserved within the Danionin clade.
- To identify potential divergence in germ plasm composition among closely related species.
Main Methods:
- Comparative analysis of germ plasm RNA localization in Danio kyathit, Danio albolineatus, and Devario aequipinnatus embryos.
- Visualization of nanos RNA to assess germ plasm segregation.
- Localization assays for ten additional zebrafish germ plasm RNAs and the ca15b component.
Main Results:
- Germ plasm segregation patterns, visualized by nanos RNA, are conserved across the studied Danionin species.
- Ten out of twelve investigated germ plasm RNAs showed conserved localization in all three non-zebrafish Danionin species.
- The germ plasm component ca15b lacked specific localization in Devario aequipinnatus embryos, suggesting divergence.
Conclusions:
- The majority of germ plasm RNA components are conserved among closely related Danionin species.
- Germ plasm composition can diverge even within a restricted phylogenetic range, as exemplified by ca15b in D. aequipinnatus.
- These findings highlight both the conservation and evolutionary plasticity of germ plasm in fish development.
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