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An alternatively spliced, 5'-truncated MAP1B isoform is expressed in the developing chick nervous system
Journal of Molecular Neuroscience : MN
|March 3, 1998
Summary
This study reveals that alternatively spliced variants of the microtubule-associated protein 1B (MAP1B) are expressed in the brain. One such variant encodes the claustrin proteoglycan, a keratan sulfate proteoglycan.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Claustrin, a keratan sulfate proteoglycan, shares high homology with mouse microtubule-associated protein 1B (MAP1B).
- Claustrin was previously identified as a 5'-truncated fragment of MAP1B.
Purpose of the Study:
- To further investigate the relationship between claustrin and MAP1B.
- To isolate and characterize a cDNA encoding the 3'-region of MAP1B, termed 3'-MAP1B-related clone (3'-MRC).
- To determine the expression patterns of claustrin and 3'-MRC in different tissues and cell types.
Main Methods:
- Molecular cloning of a 3'-MAP1B-related clone (3'-MRC).
- Northern blot analysis using claustrin and 3'-MRC cDNAs.
- Reverse transcription polymerase chain reaction (RT-PCR) to detect specific mRNAs.
Main Results:
- Distinct mRNAs are recognized by claustrin and 3'-MRC cDNAs, indicating different transcripts.
- mRNAs encoding distinct MAP1B-related molecules are present in embryonic chick brain, cardiac, and smooth muscle.
- Claustrin mRNA expression is higher in astrocyte cultures compared to 3'-MRC.
Conclusions:
- MAP1B undergoes alternative splicing, generating distinct variants expressed in the brain.
- At least one MAP1B splice variant encodes the claustrin proteoglycan.
- Differential expression of MAP1B variants suggests tissue-specific functions.