Suppression of replication of SV40 and polyoma virus in mouse-human hybrids

Mouse-human heterokaryons are permissive for the replication of both SV40 virus and polyoma virus. If the hybrids which develop from these heterokaryons segregate human chromosomes (mouse greater than human hybrids), the hybrids are permissive for replication of polyoma virus but not for replication of SV40 virus. If the subsequent hybrids segregate mouse chromosomes (human greater than mouse hybrids), such hybrids support the replication of SV40 virus but not the replication of polyoma virus, even when the hybrids contain at least one copy of each mouse chromosome. This indicates that during the transition from heterokaryon to hybrid cell, suppression of expression of species-specific function(s) required for the replication of these species-specific viruses occurs in parallel with the direction of chromosome loss and suppression of nucleolus organizer activity.

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