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A Novel Method to Profile Transcripts Encoding SH2 Domains in the Patiria miniata Mature Egg Transcriptome.

Lauren Bates1,2, Emily Wiseman3,2, Alexis Whetzel4

  • 1Biology Professional and Transfer Programs, Southern West Virginia Community and Technical College, Logan, WV 25601, USA.

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|November 27, 2024
PubMed
Summary

Researchers identified 82 sea star transcripts encoding SH2 domains, crucial for fertilization signaling. A novel bioinformatics method successfully uncovered 33 previously unidentified SH2 domain proteins, advancing egg activation research.

Keywords:
annotationde novo transcriptomeeggfertilizationmaturationoocyte

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Bioinformatics

Background:

  • Fertilization triggers a critical intracellular calcium (Ca2+) increase, essential for restarting zygote metabolism and preventing polyspermy.
  • While some signaling molecules involved in the Ca2+ rise are known in sea stars (e.g., SFK1, SFK3, PLCγ), the complete molecular cascade remains incompletely understood.
  • Proteins with SH2 domains and tyrosine phosphorylation signaling are implicated in these fertilization events.

Purpose of the Study:

  • To identify transcripts encoding SH2 domain-containing proteins in the mature egg transcriptome of the sea star *Patiria miniata*.
  • To compare the efficacy of two distinct bioinformatic strategies for identifying these transcripts.
  • To provide potential protein targets for future experimental research on sea star egg activation.

Main Methods:

  • Two bioinformatic approaches were employed on the *Patiria miniata* mature egg transcriptome (Accession PRJNA398668).
  • Method 1: Identified the longest open reading frame (ORF) per transcript and used similarity searching.
  • Method 2 (Novel): Performed a six-frame translation of the entire transcriptome to detect SH2 domains. Identified transcripts were cross-referenced with NCBI non-redundant and SwissProt databases.

Main Results:

  • A total of 82 transcripts encoding SH2 domains were identified.
  • The novel six-frame translation method uniquely identified 33 of these SH2 domain-encoding transcripts.
  • This highlights the advantage of the novel method for comprehensive protein domain identification in de novo transcriptomes.

Conclusions:

  • This study successfully identified numerous SH2 domain-containing transcripts in *Patiria miniata* eggs, contributing to understanding fertilization signaling.
  • A novel bioinformatic approach significantly enhanced the discovery of potential signaling proteins compared to traditional methods.
  • The findings offer a valuable resource of candidate proteins for future functional studies on egg activation mechanisms in marine invertebrates.