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In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing specific...

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Related Experiment Video

Updated: Jun 7, 2026

Production of Xenopus tropicalis Egg Extracts to Identify Microtubule-associated RNAs

Production of Xenopus tropicalis Egg Extracts to Identify Microtubule-associated RNAs

Published on: June 27, 2013

Spiralian quartet developmental potential is regulated by specific localization elements that mediate asymmetric RNA

Jeremy S Rabinowitz¹, J David Lambert

¹Department of Biology, University of Rochester, Rochester, NY 14627, USA.

Development (Cambridge, England)

|November 3, 2010

Summary

Spiralian embryos rely on asymmetric cell division for development. In Ilyanassa snails, IoLR5 RNA localization to specific cells is crucial for eye development and patterning, controlled by RNA sequence motifs.

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Last Updated: Jun 7, 2026

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Area of Science:

Developmental biology
Molecular biology
Invertebrate zoology

Background:

Spiralian embryos, common in invertebrates, are poorly understood at the molecular level.
Asymmetric cell division is vital for patterning, with micromere quartets playing a key role in establishing developmental potential along the animal-vegetal axis.

Purpose of the Study:

To investigate the molecular mechanisms controlling asymmetric cell division and cell fate in spiralian embryos.
To understand the role of IoLR5 RNA and protein in the patterning of Ilyanassa embryos.

Main Methods:

Tracking RNA and protein localization during embryonic development.
Performing knockdown experiments to assess the function of IoLR5.
Identifying specific RNA sequences responsible for localization.

Main Results:

IoLR5 RNA and protein are specifically segregated to first quartet cells and maintained throughout development.
Knockdown of IoLR5 leads to the loss of larval eyes.
RNA localization to first quartet cells depends on the centrosome and is driven by a specific 3' UTR sequence.

Conclusions:

Micromere quartet identity in spiralian embryos is regulated by specific RNA localization motifs.
IoLR5 plays a critical role in the development of larval eyes through its localization and function.