Pan-Cancer Landscape of Aid-Related Mutations, Composite Mutations, and Their Potential Role in the ICI Response

Authors

Isaias Hernández-Verdin
Kadir C Akdemir
Daniele Ramazzotti
Giulio Caravagna
Karim Labreche
Karima Mokhtari
Khê Hoang-Xuan
Matthieu Peyre
Franck Bielle
Mehdi Touat
Ahmed Idbaih
Alex Duval
Marc Sanson
Agustí Alentorn

Publication Date

12-1-2022

Journal

NPJ Precision Oncology

Abstract

Activation-induced cytidine deaminase, AICDA or AID, is a driver of somatic hypermutation and class-switch recombination in immunoglobulins. In addition, this deaminase belonging to the APOBEC family may have off-target effects genome-wide, but its effects at pan-cancer level are not well elucidated. Here, we used different pan-cancer datasets, totaling more than 50,000 samples analyzed by whole-genome, whole-exome, or targeted sequencing. AID mutations are present at pan-cancer level with higher frequency in hematological cancers and higher presence at transcriptionally active TAD domains. AID synergizes initial hotspot mutations by a second composite mutation. AID mutational load was found to be independently associated with a favorable outcome in immune-checkpoint inhibitors (ICI) treated patients across cancers after analyzing 2000 samples. Finally, we found that AID-related neoepitopes, resulting from mutations at more frequent hotspots if compared to other mutational signatures, enhance CXCL13/CCR5 expression, immunogenicity, and T-cell exhaustion, which may increase ICI sensitivity.

Comments

Supplementary Materials

PMID: 36456685