Tau alternative splicing in familial and sporadic tauopathies

Area of Science:

• Neuroscience
• Genetics
• Molecular Biology

Background:

• The microtubule-associated protein tau (MAPT) gene produces six tau isoforms via alternative splicing in the adult human brain.
• Mutations in MAPT cause frontotemporal dementia with parkinsonism linked to chromosome 17 (FTDP-17) by affecting alternative splicing of exon 10, which encodes a microtubule-binding motif.
• Elevated levels of exon 10-containing MAPT mRNA and the Alzheimer's-associated MAPT H1 haplotype's promotion of exon 10 inclusion suggest a role in Alzheimer's disease.

Purpose of the Study:

• To investigate the critical role of accurate tau alternative splicing in neuronal viability.
• To explore the potential contribution of altered tau splicing to Alzheimer's disease pathogenesis.
• To evaluate tau alternative splicing as a therapeutic target for familial and sporadic tauopathies.

Main Methods:

• Analysis of MAPT gene alternative splicing.
• RNA analysis to quantify MAPT mRNA levels.
• Investigation of MAPT mutations and haplotypes associated with tauopathies.

Main Results:

• Alternative splicing of the MAPT gene generates diverse tau isoforms.
• MAPT mutations and the H1 haplotype influence exon 10 splicing.
• Elevated exon 10 inclusion in MAPT mRNA is observed in Alzheimer's disease.

Conclusions:

• Precise regulation of tau alternative splicing is essential for neuronal health.
• Dysregulation of tau splicing may contribute to Alzheimer's disease development.
• Targeting tau alternative splicing presents a potential therapeutic avenue for tauopathies, including Alzheimer's disease.