A model of the sister chromatid exchange (SCE) process is outlined as a replication mechanism to bypass DNA crosslinks. The model suggests that when normal bidirectional replication advances from both sides towards a crosslink along the two opposite parental strands, the complementary parental stran
Further analysis of the replication bypass model for sister chromatid exchange
โ Scribed by D. G. Stetka
- Publisher
- Springer
- Year
- 1979
- Tongue
- English
- Weight
- 384 KB
- Volume
- 49
- Category
- Article
- ISSN
- 0340-6717
No coin nor oath required. For personal study only.
โฆ Synopsis
The replication bypass model for sister chromatid exchange (SCE) proposed by Shafer is examined in detail. When applied through two cell cycles, the model predicts that potentially observable SCEs induced during one S phase will then be cancelled and rendered undetectable during the subsequent S phase. This aspect of replication bypass is inconsistent with the observation of twin SCEs in tetraploid cells. Furthermore, the model cannot account for the efficient induction of SCEs by non-cross-linking chemical agents.
๐ SIMILAR VOLUMES
Unequal sister chromatid exchange has been proposed as one of several possible mechanisms for gene amplification resulting in tandemly repeated sequences on chromosomes. Two requirements for testing this hypothesis are analytical observations and a mathematical model. Recently observations were repo
Lymphocytes from 20 notmal subjects (11 male and 9 female) were examined for the frequency and location of sister chromatid exchanges (SCE) by the BrdU--Giemsa method. The mean frequency of SCE was 6.37 with little significant variation. One subject had a high number of exchanges in chromosome 1 whi