TISA: tissue-specific alternative splicing in human and mouse genes

Area of Science:

• Molecular Biology
• Genomics
• Bioinformatics

Background:

• Alternative splicing (AS) is a key post-transcriptional modification generating transcript diversity.
• AS plays a critical role in tissue-specific gene expression and functional specialization.
• Predicting tissue-specific AS events remains a challenge in transcriptomics.

Purpose of the Study:

• To develop and validate a novel graphing method for transcript reconstruction.
• To statistically predict tissue-specific alternative splicing events.
• To provide a comprehensive resource of tissue-specific AS in humans and mice.

Main Methods:

• A three-step selection process involving a custom scoring rule, binomial statistics, and transcript structure evaluation.
• Generation of splice graphs for transcript reconstruction.
• Statistical assessment of tissue specificity using EST data and multiple testing correction.

Main Results:

• Reconstruction of 97,286 and 66,022 valid transcripts from 26,143 human and 27,741 mouse genes, respectively.
• Discovery of 33,481 alternative splicing events across nine patterns in humans.
• Identification of 12,711 tissue-specific genes, 16,016 tissue-specific transcripts, and 1035 tissue-specific AS events in humans (FDR <0.01).

Conclusions:

• The developed method effectively reconstructs transcripts and predicts tissue-specific alternative splicing.
• The study provides a valuable, publicly accessible resource (TISA website) for exploring tissue-specific AS.
• This work enhances our understanding of transcriptomic complexity and its role in tissue differentiation.