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Targeted next-generation sequencing on Hirschsprung disease: a pilot study exploits DNA pooling
Hongsheng Gui1, Jessie Yunjuan Bao, Clara Sze-Man Tang
1Department of Surgery, The University of Hong Kong, Hong Kong, SAR, China; Department of Psychiatry, The University of Hong Kong, Hong Kong, SAR, China.
Annals of Human Genetics
|June 21, 2014
Summary
DNA pooling shows promise for identifying Hirschsprung disease (HSCR) variants but requires improved rare variant detection. Further technological advancements are needed for large-scale genetic studies.
Area of Science:
- Genetics
- Genomic Medicine
- Bioinformatics
Background:
- Hirschsprung disease (HSCR) is a complex congenital disorder.
- Identifying rare genetic variants is crucial for understanding HSCR etiology.
- Efficient and cost-effective sequencing methods are needed for large patient cohorts.
Purpose of the Study:
- To evaluate a novel targeted next-generation sequencing protocol for identifying rare variants in HSCR.
- To assess the performance of DNA pooling with PCR-based RainDance technology (RDT) for HSCR genetic studies.
Main Methods:
- Targeted resequencing of 62 genes in signaling pathways relevant to enteric nervous system development.
- DNA pooling of 20 HSCR patients and 20 controls (8 pools of 5 individuals each).
- Enrichment using PCR-based RainDance technology (RDT) and sequencing on a 454 FLX platform.
Main Results:
- DNA pooling demonstrated high specificity (98.4%) and sensitivity (83.7%) for common variants.
- Performance decreased for rare variants, with specificity/sensitivity at 65.5%/61.3%.
- Sanger sequencing validated only 5 out of 12 rare damaging variants identified through pooling.
Conclusions:
- DNA pooling is a potentially efficient approach for identifying common variants in HSCR.
- Current methods require significant improvement in rare variant detection for effective application in HSCR research.
- Further technological advancements in sequencing and variant calling are necessary for large-scale genetic studies using DNA pooling.
