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6 protocols using opticon 3

1

RNA Extraction and qRT-PCR Analysis Protocol

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1 × 108 cells were harvested at 800 ×g for 10 min at 4 °C and washed with ice-cold PBS and quick frozen in dry ice for 1 min. RNA was extracted using the RNeasy mini kit (Qiagen) according to the manufacturer's instructions and quantified using a ND-1000 spectrophotometer and Nanodrop software (Nanodrop Technologies). qRT-PCR was performed using iQ-SYBRGreen Supermix on a MiniOpticon Real-Time PCR Detection System (Bio-Rad). Quantification was done using Opticon3 software (Bio-Rad).
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2

Quantifying Xenopus mpx Gene Expression

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Embryos were injected at the one- to two-cell stage with 25–50 pg of circular etsrp-XeX as previously described (Sumanas et al., 2008 (link)) in addition to scl MO. Batches of 20 injected and control uninjected embryos were frozen on dry ice at the tail bud stage. Total RNA was purified using the RNAquous-4PCR kit (Ambion). cDNA was synthesized using Superscript III reverse transcriptase and oligo-dT primer (Invitrogen). Real-time PCR was performed using Chromo4 thermal cycler (Bio-Rad) and iQ SYBR Green Supermix (Bio-Rad). The following PCR profile was used: 95°C 5 min; 95°C 1 min, 58°C 1 min, 72°C 1 min, detection at 82°C for 10 sec; steps 2 through 5 repeated 44 times. Relative cDNA amounts for mpx were calculated using the Opticon 3 software (Bio-Rad) and normalized to the expression of elongation factor 1 α (EF1α). Primers for measuring mpx expression span an intron-exon boundary to detect cDNA instead of genomic DNA. The following primer sequences were used. mpx-Forward: CTG CGG GAC CTT ACT AAT GAT GG; mpx-Reverse: CCT GGA TAT GGT CCA AGG TGT C; EF1α-Forward: TCA CCC TGG GAG TGA AAC AGC; EF1α-Reverse: ACT TGC AGG CGA TGT GAG CAG
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3

Semi-quantitative rtPCR Gene Expression Analysis

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Semi-quantitative rtPCR was performed on a Chromo4 system with Opticon 3 software (BioRad). Fold change was calculated using the ΔΔCt model [26 ], normalized to actin (act-1). Primers are listed in S1 Table.
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4

RNA Extraction and qRT-PCR Analysis

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1 × 108 cells were harvested at 800g for 10 minutes at 4°C and washed in ice-cold PBS and quick-frozen in dry ice for 1 minute. RNA was purified using an RNeasy minikit (Qiagen) according to the manufacturer’s instructions. The RNA concentration was quantified using an ND-1000 spectrophotometer (Nanodrop Technologies). qRT-PCR was performed using iQ-SYBR green Supermix on a MiniOpticon real-time PCR (RT-PCR) detection system (Bio-Rad), and quantified using OPTICON3 software (Bio-Rad) (52 (link)). The following primers were used: IGP48-RTF (CTGCAGGCTGCCAGCTCTG), IGP48-RTR (TTTAATCTCCCGTACGCAGG), IGP40-RTF (CTGCATGTGACTGCTGCT), IGP40-RTR (TGAAAGGGTATACAACTGACC), IGP34-RTF (ATTGCGTCTACCGATGGAAC), IGP34-RTR (TAGACTCCTCATCTGAATGC). Data were normalised against TERT (telomerase reverse transcriptase) (Brenndörfer et al., 2010) (TERT-RTF (GAGCGTGTGACTTCCGAAGG) and TERT-RTR (AGGAACTGTCACGGAGTTTGC)).
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5

Newt Gadd45-β Expression Analysis

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RNA was isolated from salamander tissue culture cells using Tri Reagent (Sigma) and random primed cDNA synthesised using Superscript II (Invitrogen). Gene expression was determined by quantitative real time PCR using the following primers: Newt Gadd45-β fwd (AGGGCACAGGAAAGAAGATG); Newt Gadd45-β rev (TCATTGTCGCAGCAGAAGG); Newt L-27 fwd (TACAACCACTTGATGCCA); Newt L-27 rev (CAGTCTTGTATCGTTCCTCA). Rt-PCR was carried out using iQ SYBR Green supermix (Bio-rad, Hercules, CA) on a Chromo 4 instrument running Opticon 3 software (Bio-rad). All reactions were run in triplicate and at least 2 independent RNA preparations were analysed for each sample.
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6

Quantitative RT-PCR Analysis of Gene Expression

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1 x 108 cells were harvested at 800 g for 10 minutes at 4˚C and washed
in ice-cold PBS and quick-frozen in dry ice for 1 minute. RNA was purified using
an RNeasy minikit (Qiagen) according to the manufacturer’s instructions. The RNA
concentration was quantified using an ND-1000 spectrophotometer (Nanodrop
Technologies). qRT-PCR was performed using iQ-SYBR green Supermix on a
MiniOpticon real-time PCR (RT-PCR) detection system (Bio-Rad), and quantified
using OPTICON3 software (Bio-Rad) 52 (link). The
following primers were used: IGP48-RTF (CTGCAGGCTGCCAGCTCTG), IGP48-RTR
(TTTAATCTCCCGTACGCAGG), IGP40-RTF (CTGCATGTGACTGCTGCT), IGP40-RTR
(TGAAAGGGTATACAACTGACC), IGP34-RTF (ATTGCGTCTACCGATGGAAC), IGP34-RTR
(TAGACTCCTCATCTGAATGC). Data were normalised against TERT (telomerase reverse
transcriptase) (TERT-RTF (GAGCGTGTGACTTCCGAAGG) and TERT-RTR
(AGGAACTGTCACGGAGTTTGC).
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