Predictive value of high sensitivity C-reactive protein in the diagnosis and outcomes of acute aortic syndromes.

Objective: The purpose of this study was to determine whether high-sensitivity C-reactive protein (hsCRP) levels differ among patients with acute aortic syndromes (AAS) and if hsCRP could predict their long-term outcomes.

Design: Retrospective observational study.

Setting: Cleveland Clinic Hospital, Cleveland, Ohio.

Circadian tempo: a paradigm for genome stability?

Circadian clocks are molecular time-keeping systems that underlie daily biological rhythms in anticipation of the changing light and dark cycles. These clocks mediate daily rhythms in physiology and behavior that are thought to confer an adaptive advantage for organisms. It is hypothesized that cell cycle checkpoints are gated to an intrinsic circadian clock to protect DNA from diurnal exposure to mutagens (e.

A circadian model for viral persistence.

Persistently infecting DNA viruses depend heavily on host cell DNA synthesis machinery. Replication of cellular and viral DNA is inhibited by mutagenic stress. It is hypothesized that diurnal regulation of viral DNA replication may occur at the level of cell cycle checkpoints and DNA repair, to protect DNA from exposure to UV light or other mutagens.