Extranuclearly

Extranuclearly is an adverb used in biology to describe processes, localizations, or genetic material located outside the cell nucleus. The term denotes events taking place in extranuclear compartments, such as the cytoplasm or within organelles like mitochondria and chloroplasts, or in extrachromosomal genetic material.

In cell and molecular biology, extranuclear phenomena include transcription, translation, replication, and RNA localization that originate from organellar genomes or cytoplasmic signals rather than from the nuclear genome. Mitochondrial and chloroplast genomes are replicated and expressed extranuclearly relative to the nucleus. Extranuclear inheritance refers to the transmission of genetic information through organelles rather than through nuclear genes; mitochondrial DNA is a well-known example, often inherited maternally in many species.

Note on usage: Extranuclearly is less common than the adjective extranuclear; researchers typically use the noun or adjective forms. The adverb appears mainly in technical descriptions of localization, gene expression, or inheritance patterns that occur outside the nucleus. See also extranuclear inheritance, organelle genetics, and cytoplasmic processes for related concepts.