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Full-Text Articles in Molecular Biology
A Novel Method To Analyze Dna Breaks And Repair In Human Cells, Caitlin Elizabeth Goodman
A Novel Method To Analyze Dna Breaks And Repair In Human Cells, Caitlin Elizabeth Goodman
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Microsatellites repeat sequences are prone to forming non-canonical DNA structures and mutations. These areas of the genome can undergo expansions and contractions and are responsible for a variety of inherited neurological and neuromuscular disorders. Hairpin structures formed by trinucleotide repeats can lead to replication fork stalling, and fork collapse causing DNA double strand breaks. Various mechanisms are involved in processing microsatellites including mismatch repair, base excision repair, and crossover junction endonuclease cleavage. These processes, which are supposed to protect the genome, could also be the culprits which are causing mutations. In order to test and study this hypothesis, the use …
Instability At Trinucleotide Repeat Dnas, Rujuta Yashodhan Gadgil
Instability At Trinucleotide Repeat Dnas, Rujuta Yashodhan Gadgil
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Trinucleotide repeats (TNRs) are sequences prone to formation of non-B DNA structures and mutations; undergo expansions in vivo to cause various inherited neurodegenerative diseases. Hairpin structures formed during DNA replication or repair can cause replication fork stalling and if left unrepaired could cause single or double strand DNA breaks. To test and study this hypothesis we have devised a novel two color marker gene assay to detect DNA breaks at TNRs. By inducing replication stress our results show that TNRs are prone to DNA strand breaks and it is dependent on the repeat tract length. Double strand breaks at structured …
Due-B, A New Human Dna Replication Protein, Is The Functional Homolog Of S. Cerevisiae Sld3, Jianhong Yao
Due-B, A New Human Dna Replication Protein, Is The Functional Homolog Of S. Cerevisiae Sld3, Jianhong Yao
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DNA unwinding elements (DUEs) are commonly found at DNA replication origins. The DUE binding protein (DUE-B) is crucial for the initiation of DNA replication in eukaryotes. The unique 59 amino acid C-terminal part of DUE-B shares nearly 50% similarity with yeast the C-terminus of Sld3. DUE-B plays a key role in eukaryotic DNA replication because it is required for the loading of Cdc45, the MCM helicase activator, on chromatin. Here we show that DUE-B, just like yeast Sld3, binds to Cdc45 and TopBP1 through its C-terminus in Sf9 cells and in vitro. We also show that DUE-B, Cdc45 and TopBP1 …