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Chavez, J.

Publications and source records attributed to Chavez, J..

2 recordsLinked to original sources

Programmatic access to bacterial regulatory networks with regutools

SummaryRegulonDB has collected, harmonized and centralized data from hundreds of experiments for nearly two decades and is considered a point of reference for transcriptional regulation in Escherichia coli K12. Here, we present the regutools R package to facilitate programmatic access to RegulonDB data in computational biology. regutools gives researchers the possibility of writing reproducible workflows with automated queries to RegulonDB. The regutools package serves as a bridge between RegulonDB data and the Bioconductor ecosystem by reusing the data structures and statistical methods powered by other Bioconductor packages. We demonstrate the integration of regutools with Bioconductor by analyzing transcription factor DNA binding sites and transcriptional regulatory networks from RegulonDB. We anticipate that regutools will serve as a useful building block in our progress to further our understanding of gene regulatory networks. Availability and Implementationregutools is an R package available through Bioconductor at bioconductor.org/packages/regutools. Contactgithub.com/ComunidadBioInfo/regutools, lcolladotor@gmail.com, alejandro.reyes.ds@gmail.com.

bioinformatics

A peptidergic amygdala microcircuit modulates sexually dimorphic contextual fear

Trauma can cause dysfunctional fear regulation leading some to develop disorders like post-traumatic stress disorder (PTSD). The amygdala regulates fear, and, PACAP and PAC1 receptors are linked to PTSD symptom severity at genetic/epigenetic levels, with a strong link in females with PTSD. We discovered a PACAPergic projection from the basomedial amygdala (BMA) to the medial intercalated cells (mICCs). In vivo optogenetic stimulation of this pathway increased cfos expression in mICCs, decreased fear retention and increased fear extinction. Selective deletion of PAC1 receptors from the mICCs in females reduced fear acquisition, but enhanced fear generalization and reduced fear extinction in males. Optogenetic stimulation of the BMA-mICCs PACAPergic pathway produced excitatory postsynaptic currents (EPSCs) in mICCs neurons, which was enhanced by PAC1 receptor antagonist, PACAP 6-38. Our findings show that mICCs modulate contextual fear in a dynamic and sex-dependent manner via the microcircuit containing the BMA and mICCs, dependent on behavioral state.

neuroscience