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BLM, the Bloom's syndrome protein, varies during the cell cycle in its amount, distribution, and co-localization with other nuclear proteins.

TitleBLM, the Bloom's syndrome protein, varies during the cell cycle in its amount, distribution, and co-localization with other nuclear proteins.
Publication TypeJournal Article
Year of Publication2000
AuthorsSanz MM, Proytcheva M, Ellis NA, Holloman WK, German J
JournalCytogenet Cell Genet
Volume91
Issue1-4
Pagination217-23
Date Published2000
ISSN0301-0171
KeywordsAdenosine Triphosphatases, B-Lymphocytes, Bloom Syndrome, Cell Cycle, Cell Line, Transformed, Cell Nucleolus, Cells, Cultured, DNA Helicases, DNA-Binding Proteins, Fibroblasts, Fluorescent Antibody Technique, HL-60 Cells, Humans, Male, Nuclear Proteins, Protein Subunits, Protein Transport, RecQ Helicases, Replication Protein A
Abstract

BLM, the protein encoded by the gene mutated in Bloom's syndrome (BS), is a phylogenetically highly conserved DNA helicase that varies in amount and distribution in the nucleus during the cell-division cycle. It is undetectable in many cells as they emerge from mitosis but becomes abundant during G(1) and remains so throughout S, G(2), and mitosis. BLM is widely distributed throughout the nucleus but at certain times also becomes concentrated in foci that vary in number and size. It co-localizes transitorily with replication protein A (RPA) and promyelocytic leukemia protein (PML) nuclear bodies, and at times it enters the nucleolus. The observations support the hypothesis that BLM is distributed variously about the nucleus to manipulate DNA in some, very possibly several, nucleic acid transactions, when and where they take place. The specific transaction(s) remain to be identified. Although absence from the nucleus of functional BLM - the situation in BS - obviously is not lethal in the human, other helicases would appear to be unable to substitute for it completely, witness the hypermutability and hyperrecombinability of BS cells.

DOI
Alternate JournalCytogenet. Cell Genet.
PubMed ID11173860
Grant ListCA50897 / CA / NCI NIH HHS / United States

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