Project description:Molecular underpinnings of vertebrate retinal differentiation and maturation are poorly understood, particularly for non-mammalian species. We generated single-cell transcriptome data from the larval zebrafish retina and characterized gene expression diversity among photoreceptor subtypes and their progenitors.
Project description:Intracellular pH (pHi) dynamics regulates numerous cell behaviors, including migration and proliferation. While these functions are well-established in cell lines, the role of pHi changes in vivo is less well understood. We generated a transgenic zebrafish line expressing a fluorescent ratiometric pHi biosensor and identified functional changes in pHi during zebrafish larval tail regeneration. We found that tail amputation led to a transient decrease in pHi, followed by a prolonged increase in pHi above pre-amputation values. Moreover, we showed that pharmacologically inhibiting Na+/H+ exchanger (NHE) activity or decreasing extracellular pH attenuated the post-amputation increase in pHi, reduced subsequent cell proliferation, and impaired tail regeneration. We further found that inhibiting NHE activity post-amputation led to elevated inflammation, disrupted myeloid cell behavior, decreased reactive oxygen species, and increased glycogen synthase kinase-3 (GSK3) activity. Finally, we showed that the regeneration defects in larvae with disrupted pHi were partially rescued by the GSK3 inhibitor BIO. Our data reveal a previously unrecognized role for pHi dynamics in coordinating tissue behaviors in vivo and enabling zebrafish larval tail regeneration.
Project description:The goal of this study was to determine gene expression changes in pdgfrb-expressing (pdgfrb+) myoseptal and perivascular cells after spinal cord lesion in larval zebrafish.
Project description:We conducted a whole genome transcriptome analysis to examine significant gene expression changes in whole zebrafish larvae at 4 dpf between nlrc3l st73 mutants compared with their control siblings.
Project description:96 hpf zebrafish larvae were exposed to cold (16 C) or heat (34 C) stress for 2 and 48h. Time-matched controls were maintained at 28 C. The transcriptional responses elicited by temperature stress in larval zebrafish were investigated by microarray.