ORCID Profile
0000-0001-8295-020X
Current Organisations
Utrecht University
,
Oklahoma State University Stillwater
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Society for Neuroscience
Date: 05-2017
DOI: 10.1523/ENEURO.0143-17.2017
Abstract: Drosophila phototransduction is mediated by phospholipase C, leading to activation of transient receptor potential (TRP) and TRP-like (TRPL) channels by mechanisms that are unresolved. A role for InsP 3 receptors (IP 3 Rs) had been excluded because IP 3 R mutants ( itpr ) appeared to have normal light responses however, this was recently challenged by Kohn et al. (“Functional cooperation between the IP3 receptor and phospholipase C secures the high sensitivity to light of Drosophila photoreceptors in vivo,” Journal of Neuroscience 35:2530), who reported defects in phototransduction after IP 3 R-RNAi knockdown. They concluded that InsP 3 -induced Ca 2+ release plays a critical role in facilitating channel activation, and that previous failure to detect IP 3 R phenotypes resulted from trace Ca 2+ in electrodes substituting for InsP 3 -induced Ca 2+ release. In an attempt to confirm this, we performed electroretinograms, whole-cell recordings, and GCaMP6f Ca 2+ imaging from both IP 3 R-RNAi flies and itpr -null mutants. Like Kohn et al., we used GMRGal4 to drive expression of UAS-IP 3 R-RNAi , but we also used controls expressing GMRGal4 alone. We describe several GMRGal4 phenotypes suggestive of compromised development, including reductions in sensitivity, dark noise, potassium currents, and cell size and capacitance, as well as extreme variations in sensitivity between cells. However, we found no effect of IP 3 R RNAi or mutation on photoreceptor responses or Ca 2+ signals, indicating that the IP 3 R plays little or no role in Drosophila phototransduction.
Publisher: Oxford University Press (OUP)
Date: 03-2020
DOI: 10.1093/GIGASCIENCE/GIAA021
Abstract: Major advances in selection progress for cattle have been made following the introduction of genomic tools over the past 10–12 years. These tools depend upon the Bos taurus reference genome (UMD3.1.1), which was created using now-outdated technologies and is hindered by a variety of deficiencies and inaccuracies. We present the new reference genome for cattle, ARS-UCD1.2, based on the same animal as the original to facilitate transfer and interpretation of results obtained from the earlier version, but applying a combination of modern technologies in a de novo assembly to increase continuity, accuracy, and completeness. The assembly includes 2.7 Gb and is & × more continuous than the original assembly, with contig N50 & Mb and L50 of 32. We also greatly expanded supporting RNA-based data for annotation that identifies 30,396 total genes (21,039 protein coding). The new reference assembly is accessible in annotated form for public use. We demonstrate that improved continuity of assembled sequence warrants the adoption of ARS-UCD1.2 as the new cattle reference genome and that increased assembly accuracy will benefit future research on this species.
Publisher: Oxford University Press (OUP)
Date: 12-2010
DOI: 10.1093/NAR/GKQ1235
Publisher: Cold Spring Harbor Laboratory
Date: 05-2013
Publisher: Wiley
Date: 14-06-2020
DOI: 10.1111/AGE.12962
Location: United States of America
No related grants have been discovered for Darren Hagen.