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. 1983 Jul 11;11(13):4391–4408. doi: 10.1093/nar/11.13.4391

Comparison of the sequence organization of related retrovirus-like multigene families in three evolutionarily distant rodent genomes.

K K Lueders, E L Kuff
PMCID: PMC326054  PMID: 6306589

Abstract

Sequences related to mouse intracisternal A-particle (IAP) genes have been isolated from rat and Syrian hamster gene libraries as recombinants in lambda phage. The sequences are moderately reiterated in both these genomes but their sequence organization in the hamster genome is different from that in the rat genome. Restriction analysis and electron microscopy indicate that the Syrian hamster IAP sequences represent a family of relatively homogeneous well-conserved units; in this, they resemble the mouse IAP genes. The rat sequences, in contrast, are heterogeneous. Both the hamster and rat IAP sequences contain regions homologous to mouse IAP genes interspersed with regions of apparent non-homology. The interspersed regions range in size from 0.5-1.0 kilobases (Kb). The regions of homology among the mouse, rat and Syrian hamster IAP sequences have been mapped to a 5-6 Kb internal region on the mouse IAP genes. Mouse IAP long terminal repeat (LTR) sequences were not detected in the rat and Syrian hamster genomes. We used the thermal stability of hybrids between cloned and genomic IAP sequences to measure family homogeneity. Mouse and Syrian hamster IAP sequences are homogeneous by this criterion, but the rat IAP sequences are heterogeneous with a Tm 6 degrees C below the self-hybrid. The contrasting organization of IAP-related elements in the genomes of these rodents indicates that amplification or homogenization of this sequence family has occurred independently and at different periods of time during their evolution.

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