Are there any shared elements between gta online and story mode?

Grand Theft Auto Online operates within the same fictional universe as Grand Theft Auto V's single-player story mode. Both take place in the state of San Andreas, featuring the city of Los Santos and surrounding countryside based on Southern California. The three protagonists from the story mode—Michael De Santa, Franklin Clinton, and Trevor Philips—appear as playable characters in Online, though their roles and storylines differ between modes. Online includes missions involving these same characters and references events from the single-player campaign. Both modes utilize the same game engine, graphics, and core gameplay mechanics, allowing seamless integration of content across modes. Additionally, Online features its own narrative elements including new characters, organizations, and storylines that build upon the established world of San Andreas.