Phocaeicola vulgatus ∆
tdk strains were grown overnight in 5 mL TYG medium. Overnight cells were used to inoculate cultures at 10 mL TYG at a final dilution of 1:25 in biological triplicate. Cell growth was monitored and harvested at an OD
600 of ~0.4. When appropriate, cells were perturbed by 880 μM H
2O
2 and immediately harvested after 30 min of incubation at 37°C. Total RNA was extracted using a lysis buffer (Degnan et al., 2014 (
link)) and prepared with a Qiagen
RNeasy kit and treated with DNA-
free™ DNA Removal Kit (Invitrogen).
Complementary DNA (cDNA) was generated from 500 ng total RNA using
SUPERase•In™ RNase Inhibitor (Invitrogen) and
Superscript-II RT (Invitrogen), where the RNA template was eventually degraded by inoculating 1 N NaOH for 30 min at 65°C and neutralized with 1 N HCl. DNA was isolated using a
QIAquick spin column (Qiagen) and eluted in 10 mM Tris-Cl, pH 8.5.
Quantification of
BVU3433 gene expression was measured through real-time quantitative PCR (qPCR) using Bio-Rad
CFX96 Touch Real-Time PCR Detection System and
SYBR Green (KAPA Biosystems) fluorescent dye. The CFX Maestro Software and ∆∆C
q method (Bookout et al., 2006 (
link)) were used to process and calculate differences in
BVU3433 and
16 s rRNA (
Supplementary Table S2) expression.
BVU3366 and
BVU3378 were used as candidate genes to confirm RNA-Seq expression profiles.
Ortañez J, & Degnan P.H. (2024). Tracking and characterization of a novel conjugative transposon identified by shotgun transposon mutagenesis. Frontiers in Microbiology, 15, 1241582.