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Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
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Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
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Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
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Analysis of C. elegans muscle transcriptome using trans-splicing-based RNA tagging (SRT).

Xiaopeng Ma1,2, Ge Zhan1, Monica C Sleumer1

  • 1MOE Key Laboratory of Bioinformatics, Center for Synthetic and Systems Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China.

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Summary

We developed a new splicing-based RNA tagging (SRT) method for robust, tissue-specific gene expression profiling in C. elegans. This technique efficiently identifies novel transcripts and works even in challenging samples like dauer or aging worms.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Developmental Biology

Background:

  • Profiling tissue-specific gene expression in C. elegans is challenging with current methods, especially in dauer or aging worms.
  • Existing techniques often require delicate manipulation, limiting their applicability.

Purpose of the Study:

  • To develop an easy and robust method for tissue-specific RNA sequencing (RNA-seq) in C. elegans.
  • To leverage the endogenous trans-splicing process for targeted mRNA enrichment and profiling.

Main Methods:

  • Generated transgenic C. elegans with a tagged spliced leader (SL) RNA gene driven by a tissue-specific promoter.
  • Utilized trans-splicing to tag endogenous mRNAs specifically within the target tissue.
  • Employed the tag for enrichment and subsequent sequencing of tissue-specific mRNAs.

Main Results:

  • Successfully profiled the muscle transcriptome, demonstrating high coverage and efficient enrichment of muscle-specific genes with low background noise.
  • Showcased method robustness by profiling gene expression in dauer larvae and aging worms, revealing physiologically relevant changes.
  • Identified 461 novel RNA transcripts, likely muscle-expressed long non-coding RNAs.

Conclusions:

  • The splicing-based RNA tagging (SRT) method offers a convenient and robust tool for tissue-specific gene expression analysis.
  • SRT enables the identification of novel transcripts with a low false positive rate, even in challenging C. elegans developmental stages.