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Cloning of the cDNA encoding rat presenilin-2
1Division of Demyelinating Disease and Aging, National Institute of Neuroscience, Tokyo, Japan. tanahashi@ncnpja.ncnp.go.jp
Biochimica Et Biophysica Acta
|April 18, 1998
Summary
Researchers identified the rat presenilin-2 (PS-2) cDNA sequence, revealing high homology with human and mouse sequences. A minor splicing variant was found, but not the human exon 9 deletion variant.
Area of Science:
- Molecular Biology
- Genetics
- Neuroscience
Background:
- Presenilin proteins are crucial components of the gamma-secretase complex.
- Mutations in presenilins are linked to early-onset Alzheimer's disease.
- Understanding presenilin homologues aids in studying familial Alzheimer's disease mechanisms.
Purpose of the Study:
- To report the cDNA sequence of the rat homologue of human presenilin-2 (PS-2).
- To analyze the sequence homology of rat PS-2 with other species.
- To investigate potential splicing variants of rat PS-2.
Main Methods:
- cDNA sequencing of rat presenilin-2.
- Amino acid sequence analysis and homology comparison.
- Identification and characterization of splicing variants.
Main Results:
- The rat PS-2 cDNA encodes a 448-amino acid protein.
- High amino acid sequence homology was observed: 94.9% with human, 96.4% with mouse, and 70.8% with Xenopus.
- A minor splicing variant lacking a single glutamate was detected.
- The exon 9 deleted splicing variant, known in human PS-2, was not found in the rat.
Conclusions:
- The rat PS-2 sequence is highly conserved across mammalian species.
- Rat PS-2 exhibits structural similarities to human PS-2, making it a relevant model for studying presenilin function.
- The absence of the exon 9 deleted variant in rats suggests species-specific splicing mechanisms or functional differences.