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Related Experiment Video

Updated: May 17, 2026

Dissection of Drosophila melanogaster Flight Muscles for Omics Approaches

Dissection of Drosophila melanogaster Flight Muscles for Omics Approaches

Published on: October 17, 2019

Cotranscriptional splicing efficiency differs dramatically between Drosophila and mouse.

Yevgenia L Khodor¹, Jerome S Menet, Michael Tolan

¹Howard Hughes Medical Institute and National Center for Behavioral Genomics, Department of Biology, Brandeis University, Waltham, Massachusetts 02454, USA.

RNA (New York, N.Y.)

|October 26, 2012

Summary

This summary is machine-generated.

Cotranscriptional splicing, crucial for gene regulation, is less efficient in mice than in flies. Both species show higher efficiency for introns far from gene ends and with longer genes, suggesting more nascent time improves splicing.

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Area of Science:

Molecular Biology
Genomics
Gene Regulation

Background:

Spliceosome assembly and nascent transcript splicing are vital for eukaryotic gene regulation and isoform expression.
While cotranscriptional splicing is efficient in Drosophila, comparable genome-wide mammalian data were lacking.

Purpose of the Study:

To compare genome-wide nascent splicing efficiency between mammals (mouse) and Drosophila.
To investigate species-specific and conserved factors influencing cotranscriptional splicing.

Main Methods:

Analysis of high-throughput sequencing data from mouse liver nascent RNA.
Comparative analysis of nascent intron and exon levels between mouse and Drosophila.
Examination of intron/exon length, intron position, and gene length effects on splicing efficiency.

Main Results:

Cotranscriptional splicing is approximately twofold less efficient in mouse liver (nascent intron/exon ratio ~0.55) compared to Drosophila (~0.25).
Mouse splicing is optimal with 5'-exon lengths of 50-500 bp (exon definition), while fly splicing favors intron definition.
Conserved features include lower efficiency for alternatively annotated and single-intron genes, and higher efficiency for introns distant from gene 3' ends. Both species show increased efficiency with longer genes and introns far from the 3' end.

Conclusions:

Cotranscriptional splicing efficiency differs significantly between mammals and flies, particularly regarding exon/intron length dependencies.
Intron position relative to the 3' end and overall gene length are key conserved factors enhancing cotranscriptional splicing efficiency in both species.
Increased 'nascent time' during transcription correlates with improved cotranscriptional splicing efficiency.