Due to their large size and relatively simple organization, Drosophila nurse cells are ideally suited for live cell imaging studies. This video describes a microinjection method for exogenous compounds delivery into the cells, and the featured protocol demonstrates the procedure with fluorescent oligonucleotide probes called molecular beacons (MBs) used to visualize endogenous mRNA transcripts.
Protocol
This protocol is excerpted from Catrina et al., Visualizing and Tracking Endogenous mRNAs in Live Drosophila melanogaster Egg Chambers, J. Vis. Exp. (2019). 1. Design of MBs for Live Cell Imaging Fold the target RNA sequence to predict the mRNA target's secondary structure using the "RNA form" from the mfold server (…
Materials
Spectrofluorometer
Fluoromax-4 Horiba-Jobin Yvon
n/a
Photon counting spectrofluorometer
Quartz cuvette
Fireflysci (former Precision Cells Inc.)
701MFL
Dumont #5 tweezer
World Precision Instruments
501985
Thin tweezers are very important to separate out the individual egg chambers
Halocarbon oil 700
Sigma-Aldrich
H8898
Cover slip No.1 22 mm x 40 mm
VWR
48393-048
Dissecting microscope
Leica MZ6 Leica Microsystems Inc.
n/a
CO2 fruit fly anesthesia pad
Genesee Scienific
59-114
Tris-HCL pH 7.5
Sigma-Aldrich
1185-53-1
Magnesium chloride
Sigma-Aldrich
7791-18-6
NaCl
Sigma-Aldrich
7647-14-5
Spinning disc confocal microscope
Leica DMI-4000B inverted microscope equipped with Yokogawa CSU 10 spinning disc Leica Microsystems Inc.
n/a
Hamamatsu C9100-13 ImagEM EMCCD camera
Hamamatsu
n/a
PatchMan NP 2 Micromanipulator
Eppendorf Inc.
920000037
FemtoJet Microinjector
Eppendorf Inc.
920010504
Injection needle: Femtotips II
Eppendorf Inc.
930000043
Loading tip: 20 μL Microloader
Eppendorf Inc.
930001007
Micro Cover glasses no. 1 or 1.5, 22 mm x 40 mm
VWR
48393-026; 48393-172
Dry yeast
Any grocery store
n/a
Computer, > 20 GB RAM
Although processing can be carried out on most computers, higher capabilities will increase the speed of the processing