The group A pathogenicity island RD2: virulence role and barriers to conjugative transfer.

Serotype M28 isolates of the bacterial pathogen the group A (GAS; ), but not isolates of other serotypes, have a nonrandom association with cases of puerperal sepsis, a life-threatening infection that can occur in women following childbirth. In prior studies, we established that RD2, a pathogenicity island present in all M28 GAS isolates but mostly absent from other serotypes, is a factor in the M28-puerperal sepsis association. Here, we identified a significant reduction in the RD2 conjugation frequency in inter-serotype conjugation assays relative to intra-serotype assays.

The single-molecule accessibility landscape of newly replicated mammalian chromatin.

We present replication-aware single-molecule accessibility mapping (RASAM), a method to nondestructively measure replication status and protein-DNA interactions on chromatin genome-wide. Using RASAM, we uncover a genome-wide state of single-molecule "hyperaccessibility" post-replication that resolves over several hours. Combining RASAM with cellular models for rapid protein degradation, we demonstrate that histone chaperone CAF-1 reduces nascent chromatin accessibility by filling single-molecular "gaps" and generating closely spaced dinucleosomes on replicated DNA.

Influences of role models and other factors on physical activity amongst 6 to 16 years overweight and obese students.

Background: Physical activity is an essential aspect of living a healthy lifestyle, which offers a myriad of benefits for both the body and the mind. Nonetheless, a family history of obesity can pose significant challenges to achieving and maintaining a healthy weight, which is further exacerbated by the academic stress. Individuals who have a role model that prioritizes physical activity are more likely to develop positive and healthy habits in their lives.