Checked scientific scope
This HTML presents a selective primary-evidence overview. Every retained scientific paragraph and reference was appraised at the access depth listed below. Detailed Methods, raw data, exhaustive literature coverage and the associated source document remain outside the checked scope.
Preserving newly synthesized DNA
Schlacher and colleagues used single-molecule DNA fibers to examine nascent tracks after fork stalling. Tracks were degraded in BRCA2-deficient models but remained stable in the corresponding proficient cells. [schlacher2011] A 2011 erratum is indexed for this study. Its full correction text was not appraised; the affected material and impact on this finding remain unverified. [indexed correction]
Their BRCA2 analysis separated a RAD51-stabilization-associated fork-protection function from homology-directed double-strand-break repair. MRE11-associated degradation and chromosome-aberration endpoints supported protection of nascent DNA as a distinct contribution to genome integrity. [schlacher2011]
Track preservation measures DNA stability under the tested stress. It does not by itself resolve every stalled-fork structure or demonstrate that a break has been repaired. [schlacher2011]
Replication demand and nucleotide supply
Bester and colleagues examined newly transformed cells with uncoordinated proliferation-pathway activation. Reduced nucleotide pools accompanied altered replication dynamics and DNA-damage endpoints. [bester2011]
The authors interpreted their experimental comparisons as a mismatch between replication demand and nucleotide supply. This is a mechanism supported in those models, rather than proof that nucleotide shortage initiates every human cancer. [bester2011]
Keeping the cancer inference bounded
The studies address different failure modes: loss of nascent-DNA protection and inadequate substrate supply during proliferation. Their convergence on genome instability does not make the mechanisms interchangeable or establish a clinical diagnostic or treatment rule. [schlacher2011] [bester2011]
Primary Abstracts and bibliographic identities were inspected. Exact cell-line composition, detailed quantitative controls and patient-tumor prevalence were not established at that access depth. [schlacher2011] [bester2011]
Primary references and access depth
- Schlacher K et al. (2011). Double-strand break repair-independent role for BRCA2 in blocking stalled replication fork degradation by MRE11. Cell 145:529-42. PMID 21565612. DOI 10.1016/j.cell.2011.03.041. Access: Abstract and citation record.
- Bester AC et al. (2011). Nucleotide deficiency promotes genomic instability in early stages of cancer development. Cell 145:435-46. PMID 21529715. DOI 10.1016/j.cell.2011.03.044. Access: Abstract and citation record.
- Indexed 2011 correction for Schlacher et al. (2011). Cell 145(6):993; 10 June 2011. DOI 10.1016/j.cell.2011.05.021. Access: indexed relation and citation metadata only; full correction text not appraised.