Biochemical mechanism underlying C-ending-context deletion enrichment

Determine why trinucleotide contexts ending in cytosine are preferentially represented among the deletion-mediated pathways linking GC content to DNA storage-quality failure, using controlled DNA synthesis experiments to identify the underlying biochemical mechanism.

Background

The mediation analysis identifies deletion-type damage as the dominant statistically significant pathway connecting GC content with storage-quality failure. Among the positive mediated pathways, most occur in trinucleotide contexts ending in cytosine. The authors interpret this enrichment as evidence of sequence-context dependence, but the observational sequencing analysis cannot determine the biochemical process responsible for it. They therefore identify controlled synthesis experiments as necessary to resolve why C-ending contexts are preferentially represented.

References

However, this observational analysis does not establish the underlying biochemical mechanism, and further controlled synthesis experiments would be required to determine why C-ending contexts are preferentially represented.

— Identifying Damage Pathways Linking Sequence Composition to Storage Failure in DNA Data Storage via High-Dimensional Mediation Analysis  (2609.19822 - Li et al., 17 Sep 2026) in Section 4.2, subsection “Identification of Damage-Mediated Pathways”