Long-read sequencing for 29 immune cell subsets reveals disease-linked isoforms

Area of Science:

• Genomics
• Molecular Biology
• Immunology

Background:

• Alternative splicing is crucial for complex traits but limited by short-read sequencing.
• Novel full-length isoform annotation is needed for comprehensive analysis.

Purpose of the Study:

• To generate a full-length isoform annotation of human immune cells using long-read sequencing.
• To identify novel transcripts, characterize isoform diversity, and link isoforms to complex traits and diseases.

Main Methods:

• Long-read sequencing of 29 human immune cell subsets.
• Isoform characterization, including analysis of repetitive elements and 3'-UTR usage.
• Integration of quantitative trait loci (QTL) and genome-wide association study (GWAS) data.

Main Results:

• Generated a comprehensive full-length isoform annotation for human immune cells.
• Discovered unannotated transcripts, including a TOMM40-APOE read-through transcript.
• Identified cell-type specific isoforms and disease-associated isoforms through isoform switching and QTL/GWAS integration.

Conclusions:

• Long-read sequencing provides crucial insights into alternative splicing in immune cells.
• Repetitive elements contribute to isoform diversity and genome evolution.
• Isoform analysis advances the understanding of complex disease mechanisms.