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Molecular cloning of an alternative human alphaE-catenin cDNA
M Linkels1, M J Bussemakers, F Nollet
1Urology Research Laboratory, University Hospital Nijmegen, The Netherlands.
Abstract:
The cytoplasmic protein alpha-catenin plays a crucial role in E-cadherin mediated cell-cell adhesion by binding E-cadherin to the cytoskeleton via beta- or gamma-catenin and actin. Functional loss of one of these interacting components leads to decreased cell-cell adhesion, and therefore to loss of epithelial integrity. Northern analysis revealed two distinct alphaE-catenin transcripts in different cell lines, whereas apparently only one protein is expressed. Because of the biological importance of this protein we sought to molecularly characterize the differences between the two observed transcripts. cDNA cloning and sequence analysis revealed the earlier described 3.4 kb alphaE-catenin transcript and an alphaE-catenin transcript of approximately 3.8 kb. This larger transcript contains a 321 bp extension in the 3'UTR sequence, which probably arises as a result of alternative polyadenylation. Considering the presence of AU-rich sequences in the extension, it may be involved in mRNA stability.
Insights
Alpha-catenin, vital for cell adhesion, has two mRNA transcripts. A larger transcript variant with a 3'UTR extension may influence mRNA stability, impacting epithelial integrity.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Alpha-catenin is essential for E-cadherin-mediated cell-cell adhesion, linking E-cadherin to the actin cytoskeleton via catenin and actin.
- Loss of alpha-catenin function compromises cell-cell adhesion and epithelial integrity.
- Northern blot analysis indicated the existence of two distinct alphaE-catenin mRNA transcripts, despite apparent expression of a single protein.
Purpose of the Study:
- To molecularly characterize the differences between the two observed alphaE-catenin transcripts.
- To investigate the structural variations and potential functional implications of the identified transcripts.
Main Methods:
- cDNA cloning
- Sequence analysis
- Northern analysis
Main Results:
- Two alphaE-catenin transcripts were identified: a previously described 3.4 kb transcript and a novel approximately 3.8 kb transcript.
- The larger 3.8 kb transcript contains a 321 bp extension in its 3' untranslated region (3'UTR).
- This extension is likely generated through alternative polyadenylation and contains AU-rich elements, suggesting a role in mRNA stability.
Conclusions:
- The study identified a novel, longer alphaE-catenin transcript variant.
- The 3'UTR extension in the larger transcript may regulate mRNA stability, potentially influencing alpha-catenin protein levels and cellular adhesion.
- Understanding these transcript differences is crucial for comprehending the regulation of cell-cell adhesion and epithelial integrity.