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Updated: Jul 24, 2026
11:48
Detection of Alternative Splicing During Epithelial-Mesenchymal Transition
Published on: October 9, 2014
Three different fibronectin mRNAs arise by alternative splicing within the coding region.
Cell
|December 1, 1983
Summary
Researchers isolated rat fibronectin cDNA clones, revealing homologous sequences in cell- and heparin-binding domains. Alternative splicing generates at least three fibronectin messenger RNAs (mRNAs) from a single gene in rat liver.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- Fibronectin is a crucial extracellular matrix protein involved in cell adhesion, migration, and wound healing.
- Understanding fibronectin structure and gene expression is vital for comprehending its diverse biological roles.
Purpose of the Study:
- To isolate and characterize complementary DNA (cDNA) clones encoding rat fibronectin.
- To determine the sequence of the C-terminal domains of rat fibronectin, including binding regions.
- To investigate the molecular basis for different fibronectin messenger RNA (mRNA) variants in rat liver.
Main Methods:
- Isolation of cDNA clones using a lambda gt11 expression vector from a rat liver library.
- Restriction mapping and DNA sequencing to determine the nucleotide sequence of fibronectin cDNA.
- S1 nuclease mapping to analyze fibronectin mRNA populations.
Main Results:
- Successfully isolated and sequenced cDNA clones representing the C-terminal 35% of rat fibronectin.
- Identified homologous repeating sequences within the cell- and heparin-binding domains.
- Demonstrated the existence of at least three distinct fibronectin mRNA transcripts in rat liver, differing in coding potential due to alternative splicing.
Conclusions:
- Rat fibronectin mRNA heterogeneity arises from alternative splicing within the coding region.
- These findings suggest a single gene encodes multiple fibronectin isoforms with potentially distinct functions.
- The study provides insights into the structural basis and regulatory mechanisms of fibronectin diversity.
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