- Documentation
- A few important comments before you start
- Deplete rRNA
- STRANDED TOTAL RNA WITH RIBO-ZERO PLUS: Step 1: Hybridize Probes
- STRANDED TOTAL RNA WITH RIBO-ZERO PLUS MICROBIOME: Step 1: Hybridize Probes
- Step 2: Clean Up and Fragment RNA
- Generate cDNA
- Step 3: First strand cDNA synthesis
- Step 4: Second strand cDNA synthesis
- Step 5: cDNA clean-up
- Prepare and Amplify Libraries
- Step 6: Adenylate cDNA ends
- Step 7: Ligate Anchors
- Step 8: Clean Up Adapter-Ligated Fragments
- Step 9: Index and Amplify library
- Step 10: Clean Up Library
- Quality Checks
- Sequencing Guidelines
- Normalize and Pool
Documentation
Illumina's Stranded Total RNA Sample Prep Reference Guide. This method makes a cDNA library of all RNA molecules present in your sample after rRNA depletion.
Ribo-Zero Plus targets rRNA of human, rat, mouse, and bacteria for depletion. The success of this kit is dependent on the ability of Illumina’s rRNA depletion reagents to bind rRNAs in your target species. Check this list for compatibility of Ribo-Zero Plus depletion with your experiment.
This protocol can be modified slightly for the Stranded Total RNA Prep, Ligation with Ribo-Zero Plus Microbiome kit. THe microbiome kit is designed to remove rRNA from species most commonly found in the human microbiome. The alteration can be found in Step 1, but all other steps are the same.
A few important comments before you start
- This kit has a recommended range of 1–1000 ng purified total RNA input from high quality RNA samples (RIN ≥ 9). It optimized for 10–100 ng RNA input and our preferred use of this kit is high quality RNA at 100ng total input.
- Low-quality RNA (RIN ≥ 2) or FFPE (DV200 > 55%) samples can be used with this kit with 10–100 ng RNA input. Library performance can vary with lower input amounts and lesser quality RNA and we recommend using a different kit.
- This protocol can be performed in one day, or split into two or more days at the indicated safe stopping points.
- For 12 samples, you will need approximately 7.5 hours if completing the protocol in one day. This does not include QC steps before or after the protocol or sequencing. This estimate is based on an experienced user with multichannel pipette and vortexing bead cleanup steps. If prepping greater than 12 samples or the user is inexperienced or not using time-saving techniques, plan for more time and consider a two day prep.
- Keep all reagents on ice unless otherwise stated. Do NOT store any reagents from the fridge, especially beads, on ice.
- Have all beads at room temperature at least 30 minutes prior to use.
- Aliquot the reagents that arrive in large quantities (such as bead washing buffer) into 2 mL Eppendorf tubes.
- Use only filter pipette tips and clean your area so it is free of RNases.
- Ensure that the AMPureXP beads are mixed well immediately prior to use.
- There are many mixing steps in this protocol - I frequently use a multi-channel pipette to help speed up this process, particularly if many libraries are being prepared. Samples can also be mixed by sealing the plate and shaking as described in the Sample Prep Guide linked above.
- We use a Tapestation to assay the input RNA quality. RNA Integrity Numbers (RIN) of 7 and higher are preferred.
- We quantify the input RNA using a Qubit fluorometer.
Deplete rRNA
The following items are included in the Illumina kit. We recommend kits be stored as received in the original manufacturer’s boxes and not unpacked to organize in a reagent box. When kits go bad, it is much easier to contain the damage if reagents were stored as received.
This kit has 3 boxes of reagents in the -20C freezer, each labeled with a red dot saying "Total RNA". Make sure you are using the correct boxes and return all reagents to the box they came from. Do not mix reagents with other boxes.
NAME | LOCATION | ACTION |
---|---|---|
Elution Buffer (ELB) | -20°C Freezer (Ribo Zero Plus box, clear cap) | Thaw at RT, vortex and centrifuge briefly |
Depletion Probe Buffer (DB1) | -20°C Freezer (Ribo Zero Plus box, blue cap) | Thaw at RT, vortex and centrifuge briefly |
Depletion Probe Pool (DP1) | -20°C Freezer (Ribo Zero Plus box, blue cap) | Thaw at RT, vortex and centrifuge briefly |
Depletion Probe Microbiome (DPM) (for microbiome kit ONLY) | -20°C Freezer (alone in its own box) | Thaw at RT, vortex and centrifuge briefly |
RNA Depletion Buffer (RDB) | -20°C Freezer (Ribo Zero Plus box, yellow cap) | Thaw and keep on ice, vortex briefly before use |
RNA Depletion Enzyme (RDE) | -20°C Freezer (Ribo Zero Plus box, yellow cap) | Store until needed, flick to mix, centrifuge briefly |
Probe Removal Buffer (PRB) | -20°C Freezer (Ribo Zero Plus box, red cap) | Thaw at RT, vortex and centrifuge briefly |
Probe Removal Enzyme (PRE) | -20°C Freezer (Ribo Zero Plus box, red cap) | Store until needed, flick to mix, centrifuge briefly |
NAME | LOCATION | ACTION | VOLUME |
---|---|---|---|
Ampure XP Beads/Homemade beads | 4°C Fridge | Let stand at RT for 30 minutes to bring to RT, vortex and invert thoroughly before use | 174uL per sample for entire prep |
RNAClean XP Beads (Ampure beads can also be used, but RNAClean are certified free of RNases) | 4°C Fridge | Let stand at RT for 30 minutes to bring to RT, vortex and invert thoroughly before use | 60 uL per sample for entire prep |
Fresh 80% Ethanol (200 proof EtOH + MilliQ water) | RT Bench | Mix fresh each day. Low% EtOH negatively affects cleanups. | 1.6mL per sample for entire prep |
RNAse Free RT-PCR Grade Water | -20°C Freezer | Thaw at RT | As needed for diluting RNA input |
Magnetic Stand for 96 well plates | RT Bench |
STRANDED TOTAL RNA WITH RIBO-ZERO PLUS: Step 1: Hybridize Probes
STRANDED TOTAL RNA WITH RIBO-ZERO PLUS MICROBIOME: Step 1: Hybridize Probes
Name | Volume (µL) |
---|---|
DB1 (blue cap) | 3.6 µL |
DP1 (blue cap) | 1.2 µl |
DPM (clear cap) | 1.2 µL |
NAME | LOCATION | ACTION |
---|---|---|
Elute, Prime, Fragment High Mix (EPH3) | -20°C Freezer (cDNA synthesis box) | Thaw at RT, vortex and centrifuge briefly |
First Strand Synthesis Act D Mix (FSA) | -20°C Freezer (cDNA synthesis box, brown tube) | Thaw and keep on ice, vortex briefly before use |
Step 2: Clean Up and Fragment RNA
Generate cDNA
Step 3: First strand cDNA synthesis
NAME | LOCATION | ACTION |
---|---|---|
Ampure XP Beads/Homemade Beads | 4°C Fridge | Let stand at RT for 30 minutes to bring to RT, vortex and invert thoroughly before use |
Resuspension Buffer (RSB) | -20°C Freezer (cDNA synthesis box) | Thaw at RT, vortex briefly |
Reverse Transcriptase (RVT) | -20°C Freezer (cDNA synthesis box) | Store until needed. Flick to mix, centrifuge briefly |
Second Strand Marking Mix (SMM) | -20°C Freezer (cDNA synthesis box) | Thaw on ice, invert to mix, centrifuge briefly |
Step 4: Second strand cDNA synthesis
When the first strand synthesis is completed, immediately proceed to the second strand synthesis.
Step 5: cDNA clean-up
Prepare and Amplify Libraries
Step 6: Adenylate cDNA ends
NAME | LOCATION | ACTION |
---|---|---|
RNA Anchor Plate | -20°C Freezer | Thaw at RT, vortex, centrifuge briefly |
DNA/RNA UDI Index Adapter Plate | -20°C Freezer | Thaw at RT, vortex, centrifuge for 1 minute |
A-Tailing Mix (ATL4) | -20°C Freezer (Ligation box) | Thaw at RT, flick to mix, centrifuge briefly |
Stop Ligation Buffer (STL) | -20°C Freezer (Ligation box, red cap) | Thaw at RT, vortex, centrifuge briefly |
Ampure XP Beads/Homemade beads | 4°C Fridge | Let stand at RT for 30 minutes to bring to RT, vortex and invert thoroughly before use |
Resuspension Buffer (RSB) | -20°C Freezer (Ligation box) | Thaw at RT, vortex briefly |
Enhanced PCR Mix (EPM) | -20°C Freezer (Ligation box) | Thaw at RT, invert to mix, centrifuge briefly |
Ligation Mix (LIGX) | -20° Freezer (Ligation box) | Store until needed, flick to mix, centrifuge briefly |
Step 7: Ligate Anchors
Each well of the anchor plate is single-use and contains the same RNA Index Anchors. They can be used in any order. Seal the used anchor wells with foil and label before returning to freezer storage.
Order of Addition | Reagent | Vol for Sample Input < or = 100ng | Vol for Sample Input > 100ng |
---|---|---|---|
1 | RSB | 2.5 uL | 0 uL |
2 | RNA Index Anchors | 2.5 uL | 5 uL |
3 | LIGX | 2.5 uL | 2.5 uL |
Step 8: Clean Up Adapter-Ligated Fragments
Step 9: Index and Amplify library
Step 10: Clean Up Library
Congratulations! You’re done!…well, almost
Quality Checks
Perform quality control steps:
Libraries can be stored at -20 for up to 30 days.