dna secondary structure at chromosomal fragile sites in human disease

CFS-ATs may form DNA secondary structures on lagging strands during DNA replication and upon replication stress more ssDNA is accumulated leading to increased formation of DNA secondary structures at CFS-ATs which would further stall DNA replication and cause replication fork collapse. FRA3B is the most common fragile site on normal human chromosomes and maps on the short arm of chromosome 3 3 p142.

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Pierces 13 research works with 500 citations and 1342 reads including.

. This demonstrates that DNA fragility measured by the GCR rate in yeast reflects the ability of these human sequences to form stable DNA secondary structure. Despite the correlation unbiased examination of the ability to form secondary structures has not been evaluated in fragile sites. Rare fragile sites are the.

Thys Ryan G. However as DNA undergoes dynamic processes such as replication and transcription B-DNA is able to take on alternative conformations including Z-DNA hairpins cruciforms triplex DNA and quadruplexes among. Secondary structure-forming sequences are often found at chromosomal fragile sites which are hotspots for sister chromatid exchange chromosomal translocations and deletions.

Our studies are aimed at understanding the genesis of breakpoints that occur at or near fragile sites during oncogenesis. 1 1 2Fragile sites may be seen on all human chromosomes and are named according to the chromosome band they are observed in eg. Pierce Levi C T et al.

Chromosomal fragile sites which are regions of the genome that exhibit chromosomal breakage under conditions of mild replication stress are predicted to form stable DNA secondary structures. Environmental and chemotherapeutic agents induce breakage at genes involved in leukemia-causing gene rearrangements in human hematopoietic stemprogenitor cells. I Genome-wide DNA Secondary Structure Analysis to Investigate DNA Fragility supported by RO1 GM101192-01A1 July 1 2013- June 30 2017 Chromosomal fragile sites which are regions of the genome that exhibit chromosomal breakage under conditions of mild replication stress are predicted to form stable DNA secondary structures.

In addition to observed fragile site in CGG repeats in human disease recent studies have shown that chromosome breakage can occur at CTG repeats at or above 130 in yeast. This review details the relationships between the structural diversity of DNA its secondary structure or DNA-directed mutagenesis and the expansion of triplet repeats. Secondary structure-forming sequences are often found at chromosomal fragile sites which are hotspots for sister chromatid exchange chromosomal translocations and deletions.

2015 Environmental and chemotherapeutic agents induce breakage at genes involved in leukemia-causing gene rearrangements in human. DNA breakage at fragile sites is associated with regions that are deleted amplified or rearranged in cancer. During each cell division numerous proteins and signaling pathways function together to ensure the complete duplication of the human genome.

Based on the frequency of fragile site induction they are categorized as common and rare fragile sites. However some genomic regions can raise specific problems for the replication machinery leading to chromosome breakage and genome instability. It is possible that DNA strand breaks at fragile sites provide targets for viral integration.

Pierce Levi C T et al. But until recently little direct evidence existed linking fragile site breakage to the formation of cancercausing chromosomal aberrations. Secondary structure-forming sequences are often found at chromosomal fragile sites which are hots.

DNA is most commonly found as a right-handed double-helical structure known as B-DNA. The Human Genome Database currently documents 120 chromosome fragile sites 30 of the rare type and 90 of the common type Tables 211 and 212. Chromosome fragile sites are defined as gaps constrictions or breaks on metaphase chromosomes that are induced by various DNA replication inhibitors.

Studies have revealed that DNA breakage at fragile sites can induce formation of RETPTC rearrangements and deletions within the FHIT gene resembling those observed in human tumors. Fragile sites are gaps constrictions or breaks on metaphase chromosomes that arise when cells are exposed to a perturbation of the DNA replication process Fig. FraXq273 and in addition receive an official.

I Genome-wide DNA Secondary Structure Analysis to Investigate DNA Fragility supported by RO1 GM101192-01A1 July 1 2013- June 30 2017 Chromosomal fragile sites which are regions of the genome that exhibit chromosomal. Chromosomal fragile sites which are regions of the genome that exhibit chromosomal breakage under conditions of mild replication stress are predicted to form stable DNA secondary structures. Curr Genomics 1660-70 Thys Ryan G.

Common fragile sites are sensitive to replication stress and often rearranged in cancer. During recombination in yeast repair of double strand breaks induces CTG instability that depends on both Rad52p and Rad1p 31. DNA replication is a key biological process in all organisms.

Fragile sites are the chromosomal regions that are susceptible to breakage and their frequency varies among the human population. 2015 DNA secondary structure at chromosomal fragile sites in human disease. DNA Secondary Structure in Human Disease.

These findings demonstrate the important role of fragile sites in cancer development suggesting that a better understanding of the molecular basis of fragile site instability is. DNA has the ability to form a variety of secondary structures that can interfere with normal cellular processes and many of these structures have been associated with neurological diseases and cancer. Thys R Lehman C Pierce L Wang YH.

DNA secondary structure at chromosomal fragile sites in human disease. Studies have revealed that DNA breakage at fragile sites can induce formation of RETPTC rearrangements and deletions within the FHIT gene resembling those observed in human tumors. DNA has the ability to form a variety of secondary structures that can interfere with normal cellular processes and many of these structures have been associated with neurological diseases and cancer.

DNA breakage at fragile sites is associated with regions that are deleted amplified or rearranged in cancer. Each human sequence was inserted into the chromosome V arm in two orientations relative to the replication origin ARS 507 and this design places the positive strand of the human sequence in either. The etiology of fragile X syndrome myotonic dystrophy and Kennedys disease has been attributed to the massive expansion of triplet repeat DNA sequences.

The formation of alternative DNA secondary structures can result in DNA breakage leading to cancer and other diseases. DNA secondary structure at chromosomal fragile sites in human disease. Here using the Mfold program we predict potential DNA secondary structure formation on the human chromosome 10 sequence and.

Cytologically it is similar to the well known fragile X site associated with X-linked mental retardation. Alternative DNA secondary structure formation affects RNA polymerase II promoter-proximal pausing in.

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