DNA-end correction linked to better cell-free DNA profiling
The JEEPERS framework detected and corrected false methylation signals introduced when cell-free DNA was prepared for sequencing.
Limit: JEEPERS misses jagged ends in unmethylated regions or regions lacking CpG sites
Stake: Authors hold shares in Foresight Diagnostics.
Edited by Boris Djordjevic · AgingResearch.News
Researchers presented and evaluated JEEPERS, a framework to detect and correct errors in methylation profiling of cell-free DNA, fragments found outside cells. Methylation consists of chemical marks on DNA. Preparing DNA for sequencing can involve repairing uneven fragment ends, a step that can introduce false methylation signals.
The framework detected and corrected these errors while preserving the DNA’s paired strands and original methylation patterns. The authors reported accurate measurement of tumor burden, the amount of cancer present. They also reported better performance in identifying tumor-type methylation patterns, estimating age from methylation patterns and estimating which cell types contributed the DNA.
Why it matters
DNA methylation patterns form the basis of molecular age estimates. Accurate measurement matters when researchers use these estimates to study aging.
Caveats
The abstract does not describe the study population or give sample sizes or numerical performance comparisons, limiting assessment of the reported gains.
From the paper
- Participants
To evaluate generalizability beyond NSCLC and EM-seq, we next applied JEEPERS to published WGBS profiling data from 66 individuals with breast or prostate cancers and 14 controls.
Quoted word for word from the full text on nature.com.
