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The human intersectin genes and their spliced variants are differentially expressed
C Pucharcos1, C Casas, M Nadal
1Down Syndrome Research Group, Medical and Molecular Genetics Center-IRO, Gran Via s/n Km 2.7, L'Hospitalet de Llobregat, 08907, Barcelona, Spain.
Biochimica Et Biophysica Acta
|November 3, 2001
Summary
Human intersectins (ITSN1 and ITSN2) are key proteins in endocytosis. Their gene structures and tissue-specific expression reveal complex regulation during development, particularly in the mouse brain.
Area of Science:
- Molecular Biology
- Cell Biology
- Genomics
Background:
- Intersectins (ITSN1 and ITSN2) are conserved proteins crucial for clathrin-mediated endocytosis.
- Both human intersectins exist as short and long isoforms with distinct protein domain compositions.
Purpose of the Study:
- To elucidate the genomic origin of alternatively spliced ITSN2 transcripts by resolving its exon/intron structure.
- To compare the genomic organization of human ITSN1 and ITSN2 genes.
- To analyze the tissue-specific and developmental expression patterns of ITSN transcripts.
Main Methods:
- Exon/intron structure determination of the ITSN2 gene.
- Comparative genomic analysis of ITSN1 and ITSN2.
- Extensive tissue expression analysis of ITSN transcripts.
- In situ hybridization in mouse brain to study differential expression.
Main Results:
- The exon/intron structure of the ITSN2 gene was resolved, explaining alternative splicing.
- Genomic organization of human ITSN1 and ITSN2 genes shows high conservation, including major alternative splicing events.
- ITSN expression is regulated by tissue and developmental controls, with differential expression evident in the mouse brain.
Conclusions:
- The genomic structure provides insight into the alternative splicing of ITSN2.
- Intersectin expression is dynamically regulated across tissues and developmental stages.
- Differential expression patterns suggest specialized roles for ITSN1 and ITSN2 in the brain.