Hawthorne root (Crataegus mexicana) toxicity.

Here we present the case of a patient who purchased a Hawthorne root (Crataegus mexicana) product, Raiz de Tejocote, for weight loss purposes. She presented with diffuse myalgias, dizziness and a heart rate of 52 beats per minute. At triage and at initial evaluation, the patient denied taking any medications, but on iterative questioning concerning over-the-counter, over-the-internet and herbal medications, she reported taking Hawthorne root tablets in the three days prior to the emergency department (ED) visit for the purpose of weight loss.

Genome-wide Identification of Structure-Forming Repeats as Principal Sites of Fork Collapse upon ATR Inhibition.

DNA polymerase stalling activates the ATR checkpoint kinase, which in turn suppresses fork collapse and breakage. Herein, we describe use of ATR inhibition (ATRi) as a means to identify genomic sites of problematic DNA replication in murine and human cells. Over 500 high-resolution ATR-dependent sites were ascertained using two distinct methods: replication protein A (RPA)-chromatin immunoprecipitation (ChIP) and breaks identified by TdT labeling (BrITL).