Abstract
Bloom's syndrome (BS) is an autosomal recessive disorder associated with dwarfism, immunodeficiency, reduced fertility, and elevated levels of many types of cancer. BS cells show marked genomic instability; in particular, hyperrecombination between sister chromatids and homologous chromosomes. This instability is thought to result from defective processing of DNA replication intermediates. The gene mutated in BS, BLM, encodes a member of the RecQ family of DExH box DNA helicases, which also includes the Werner's syndrome gene product. We have investigated the mechanism by which BLM suppresses hyperrecombination. Here, we show that BLM selectively binds Holliday junctions in vitro and acts on recombination intermediates containing a Holliday junction to promote ATP-dependent branch migration. We present a model in which BLM disrupts potentially recombinogenic molecules that arise at sites of stalled replication forks. Our results have implications for the role of BLM as an anti-recombinase in the suppression of tumorigenesis.
DOI
10.1073/pnas.100448097
Publication Date
2000-06-06
Publication Title
Proceedings of the National Academy of Sciences
Volume
97
Issue
12
Publisher
Proceedings of the National Academy of Sciences
ISSN
1091-6490
Embargo Period
2024-11-19
First Page
6504
Last Page
6508
Recommended Citation
Karow, J., Constantinou, A., Li, J., West, S., & Hickson, I. (2000) 'The Bloom's syndrome gene product promotes branch migration of Holliday junctions', Proceedings of the National Academy of Sciences, 97(12), pp. 6504-6508. Proceedings of the National Academy of Sciences: Available at: https://doi.org/10.1073/pnas.100448097
