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- W2001193188 abstract "The RecQ helicase superfamily has been implicated in DNA repair and recombination. At least five human RecQ-related genes exist: RecQ1, BLM, WRN, RecQ4 and RecQ5. Mutations in BLM, WRN and RecQ4 are associated with Bloom, Werner and Rothmund-Thomson syndromes, respectively, involving a predisposition to malignancies and a cellular phenotype that includes increased chromosome instability. RecQ5 is small, containing only a core part of the RecQ helicase, but three isomer transcripts code for small RecQ5α (corresponding to the original RecQ5 with 410 amino acids), new large RecQ5β (991 amino acids) and small RecQ5γ (435 amino acids) proteins that contain the core helicase motifs. By determining the genomic structure, we found that the three isoforms are generated by differential splicing from the RecQ5 gene that contains at least 19 exons. Northern blot analysis using a RecQ5β-specific probe indicates that RecQ5β mRNA is expressed strongly in the testis. Immunocytochemical staining of three N-terminally tagged RecQ5 isomers expressed in 293EBNA cells showed that RecQ5β migrates to the nucleus and exists exclusively in the nucleoplasm, while the small RecQ5α and RecQ5γ proteins stay in the cytoplasm. Immunoprecipitation and an extended cytochemical experiment suggested that the nucleoplasmic RecQ5β, like yeast Sgs1 DNA helicase, binds to topoisomerases 3α and 3β, but not to topoisomerase 1. These results predict that RecQ5β may have an important role in DNA metabolism and may also be related to a distinct genetic disease." @default.
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- W2001193188 date "2000-04-01" @default.
- W2001193188 modified "2023-09-25" @default.
- W2001193188 title "Human RecQ5beta, a large isomer of RecQ5 DNA helicase, localizes in the nucleoplasm and interacts with topoisomerases 3alpha and 3beta" @default.
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- W2001193188 doi "https://doi.org/10.1093/nar/28.7.1647" @default.
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