Gradient expression of Cdx along the rat intestine throughout postnatal development
J N Freund1, R Boukamel, A Benazzouz
1INSERM U61, Strasbourg, France.
FEBS Letters
|December 14, 1992
Summary
Researchers identified rat Cdx genes, crucial for intestinal development. They found distinct Cdx mRNA variants present at different developmental stages and locations within the rat intestine.
Area of Science:
- Molecular Biology
- Genetics
- Developmental Biology
Background:
- The Cdx1 homeogene is selectively expressed in intestinal cells of endodermal origin in mice.
- Understanding the homologous genes in rats is crucial for comparative studies of intestinal development.
Purpose of the Study:
- To isolate and characterize rat Cdx genes.
- To investigate the expression patterns of Cdx mRNA during postnatal development in rats.
Main Methods:
- Genomic DNA isolation and Southern blot analysis to identify Cdx genes in the rat genome.
- Northern blot analysis to detect and quantify Cdx mRNA transcripts in different age groups and intestinal regions.
Main Results:
- The rat genome contains a single or a few closely related Cdx genes.
- Two major Cdx mRNA transcripts (1.7 kb and 6.5 kb) were identified.
- The 1.7 kb transcript was found in neonate, suckling, and adult rats, while the 6.5 kb transcript was specific to suckling and adult rats. Both decreased in concentration from colon to small intestine.
Conclusions:
- Rat Cdx genes are conserved and exhibit distinct developmental and regional expression patterns.
- The differential expression of Cdx mRNA suggests a role in regulating intestinal development and function.
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