RNA Detection

18. RNA ISO Buffer: 0.2 M Tris–HCl pH 7.5, 0.5 M NaCl,
    0.01 M EDTA, 1 v/v % SDS. Filter-sterilize before first use
    (0.2μm filter), and store at room temperature (seeNote 1).

2.2 Poly(A) Selection 1. Adjustable temperature thermomixer.

2. Magnetic stand for 1.75 mL microcentrifuge tubes.


3. Dynabeads mRNA purification kit (ThermoFisher Scientific).

2.3 rRNA Depletion 1. Adjustable temperature thermomixer.

2. Nuclease-free 1.75 mL microcentrifuge tubes.


3. Thermocycler (0.2 mL tube volume).


4. Ribo-Zero Magnetic Gold kit for yeast (Epicentre/Illumina)
   (seeNote 2).


5. Agencourt RNAclean XP beads (Beckman Coulter).


6. 80% ethanol (seeNote 3).

2.4 G–I Tailing
of RNA

1. Nuclease-free 0.2 mL PCR strip tubes.


2. Refrigerated microcentrifuge.


3. Yeast poly(A) polymerase (PAP) (Affymetrix, 74225Y).


4. 3 M sodium acetate (NaOAc) pH 5.5.


5. 15 mg/mL GlycoBlue.


6. G-I tailing master mix (per sample): 4μL5PAP Reaction
   buffer, 2μL nuclease-free water, 1μL 10 mM GTP, and 1μL
   3.3 mM ITP.

2.5 U-Select Reverse
Transcription

1. Reverse transcriptase (e.g., SuperScript III ThermoFisher
   Scientific).


2. Ribonuclease H (e.g., ThermoFisher Scientific).


3. PCR Purification kit (e.g., GeneJET, ThermoFisher Scientific).


4. 1 μM U-select oligo 5^0 - GCCTTGGCACCCGAGAATTC-
   CACCCCCCCCCAAA-3^0.
   The three adenosines on the 3^0 end of the U-select oligo
   preferentially anneal to RNAs that end in uridines (prior to
   the G/I-tailing), thus selectively enriching for U-Tagged
   RNAs. The nine cytosines anneal to the G–I tail. The under-
   lined portion corresponds to Illumina 3^0 adapter sequence vital
   for PCR amplification.


5. RT master mix (per sample): 4μL5SuperScript III Reaction
   Buffer, 1 μL 100 mM DTT, and 1 μL RNaseOUT (e.g.,
   ThermoFisher Scientific).

2.6 Second Strand
Synthesis of DNA

1. 5 U/μL Exo-Klenow Fragment DNA Polymerase I.


2. 80% ethanol (seeNote 3).

458 Christopher P. Lapointe and Marvin Wickens