DNA copy number, including telomeres and mitochondria, assayed using next-generation sequencing.

Area of Science:

• Genomics
• Molecular Biology
• Bioinformatics

Background:

• DNA copy number variations (CNVs) are common in populations and linked to various diseases.
• Existing methods for CNV profiling can be costly and lack efficiency.
• There is a need for improved, automatable, and accurate platforms for DNA copy number analysis.

Purpose of the Study:

• To develop an improved, lab-automatable, cost-efficient, and accurate platform for profiling DNA copy number.
• To create a sequencing-based assay capable of analyzing nuclear, mitochondrial, and telomeric DNA copy number.

Main Methods:

• Development of a novel sequencing-based assay.
• Incorporation of techniques from RNA expression profiling.
• Assay of UMC-11 cells using next-generation sequencing (NGS) with 5 million 33 nt reads.

Main Results:

• Demonstrated significant copy number variation in UMC-11 cells, including deletions and amplifications up to 29 copies.
• Identified a 5-fold increase in mitochondrial DNA and a 4-fold decrease in telomeric DNA compared to control DNA.
• Determined that UMC-11 cells originated from a male individual.

Conclusions:

• The developed assay provides absolute copy number with error estimates (p-value).
• The platform exhibits higher accuracy than array-based methods, especially at high copy numbers.
• It enables profiling of mitochondrial levels and telomeric length, with tunable genomic resolution and cost based on sequencing depth.