Editor's Note: Toolboxes are intended to briefly highlight and evaluate an emerging approach or a resource that is becoming widely used in neuroscience. For more information, see http://www.jneurosci.org/misc/itoa.shtml.
The Muller F element (4.2 Mb, ~80 protein-coding genes) is an unusual autosome of Drosophila melanogaster; it is mostly heterochromatic with a low recombination rate. To investigate how these properties impact the evolution of repeats and genes, we manually improved the sequence and annotated the genes on the D. erecta, D. mojavensis, and D. grimshawi F elements and euchromatic domains from the Muller D element. We find that F elements have greater transposon density (25–50%) than euchromatic reference regions (3–11%). Among the F elements, D. grimshawi has the lowest transposon density (particularly DINE-1: 2% vs. 11–27%). F element genes have larger coding spans, more coding exons, larger introns, and lower codon bias. Comparison of the Effective Number of Codons with the Codon Adaptation Index shows that, in contrast to the other species, codon bias in D. grimshawi F element genes can be attributed primarily to selection instead of mutational biases, suggesting that density and types of transposons affect the degree of local heterochromatin formation. F element genes have lower estimated DNA melting temperatures than D element genes, potentially facilitating transcription through heterochromatin. Most F element genes (~90%) have remained on that element, but the F element has smaller syntenic blocks than genome averages (3.4–3.6 vs. 8.4–8.8 genes per block), indicating greater rates of inversion despite lower rates of recombination. Overall, the F element has maintained characteristics that are distinct from other autosomes in the Drosophila lineage, illuminating the constraints imposed by a heterochromatic milieu.
The main purpose of this study was to evaluate participant engagement and effects of an Internet-based, self-directed program for depressive symptoms piloted among adults with a chronic disease. Eligible participants ( N = 47) were randomly assigned to either the "Think Clearly About Depression" online depression self-management program or the control group. The Patient Health Questionnaire-8 and Chronic Disease Self-Efficacy Scales were administered at baseline and at Weeks 4 and 8 after initiating the intervention. Number Needed to Treat analysis indicated that one in every three treatment group participants found clinically significant reductions in depressive symptoms by Week 8. Paired-sample t tests showed that depressive symptoms and self-efficacy in management of depressive symptoms improved over time for those in the treatment group and not for those in the control group. Participants' engagement and satisfaction with the online program were favorable.
Patients who are contacted for ED follow-up by phone and text, though perhaps not more satisfied, may tend to revisit the ED and contact their PMD or specialty physician less often than patients receiving standard written discharge instructions. However, this pilot study is underpowered, so larger randomized studies are needed to confirm.
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