Histone H3 Variants in the Multiverse of Cancer

Our understanding of cancer genomes has allowed for the integration of molecular data into histopathological classifications for routine stratification of patients. In the last 10–15 years, thanks to this systematic implementation of large-scale sequencing, the identification of hotspot somatic mutations in histone genes came into the limelight, underscoring the concept of oncohistones. As drivers in pediatric brain tumors, and in several other types of cancers, oncohistones brought a “new dimension of Strange” into the cancer multiverse, to paraphrase Marvel. An integrative approach to cancer complexity as a multidimensional projection is urgently needed to consider all relevant etiological, developmental, and evolutionary components. Here, we discuss recent progress on histone variants and chaperones, their regulation and alterations in cancers, the available in vivo models, and current treatment strategies. More specifically, we adopt a view through the lens of tissue-specific differences and means for genome expression and integrity maintenance.