As represented in the three panels of Figure 3A, we can observe a pattern of viral replication throughout time for all different shRNA clones.
It was found that cells with impaired function of thymidylate synthase (ThyA) seemed to exhibit a changed pattern of replication fork organization [24].
The result shows that cells, when treated with HU, acquire a changed pattern of replication (longer C and more forks), but the distribution of SeqA foci does not change significantly.
These data suggest that there is a temporal pattern of replication for some functionally related genes.
New phenotypes were tested in the same cohorts and new cohorts were tested for the same associations, each having somewhat limited success, resulting in a complicated pattern of replication and non-replication that hinders final interpretation [ 11, 36 49].
A correlation between the temporal pattern of replication and the density of active transcription for D. melanogaster chromosome arm 2L has been described [ 21], and a positive association between transcription and replication early in S phase has been reported for human chromosome 22 [ 22].
However, this abnormal pattern of replication (an epigenetic aberration), which is shown to be independent of disease status, is abolished in lymphocytes derived from patients following allogeneic stem-cell transplantation.
After each initiation of DNA replication, the replication fork is kept blocked so that the Caulobacter cell cycle can follow a pattern of once-and-only-once replication per division (G1, S, and G2 phases are temporally distinguished).
However, in PHA-stimulated peripheral blood lymphocytes of the cancer patients, the SNRPN gene exhibited a relaxation, almost a loss, leaving only remnants of its characteristic asynchronous pattern of replication.
Recent studies have begun to elucidate the pattern of replication timing on a genomic scale.
The sparser pattern of replication in superficial nuclei might be due to a slower or intermittent suprabasal DNA replication.
