Abstract
Stable and uniform expression of reference genes across samples plays a key role in accurate normalization of gene expression by reverse-transcription quantitative polymerase chain reaction (RT-qPCR). For rice study, there is still a lack of validation and recommendation of appropriate reference genes with high stability depending on experimental conditions. Eleven candidate reference genes potentially owning high stability were evaluated by geNorm and NormFinder for their expression stability in 22 various experimental conditions. Best combinations of multiple reference genes were recommended depending on experimental conditions, and the holistic stability of reference genes was also evaluated. Reference genes would become more variable and thus needed to be critically selected in experimental groups of tissues, heat, 6-benzylamino purine, and drought, but they were comparatively stable under cold, wound, and ultraviolet-B stresses. Triosephosphate isomerase (TI), profilin-2 (Profilin-2), ubiquitin-conjugating enzyme E2 (UBC), endothelial differentiation factor (Edf), and ADP-ribosylation factor (ARF) were stable in most of our experimental conditions. No universal reference gene showed good stability in all experimental conditions. To get accurate expression result, suitable combination of multiple reference genes for a specific experimental condition would be a better choice. This study provided an application guideline to select stable reference genes for rice gene expression study.
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Abbreviations
- RT-qPCR:
-
Reverse-transcription quantitative polymerase chain reaction
- UBQ5 :
-
Ubiquitin5
- EF-1α :
-
Eukaryotic elongation factor-1 alpha
- UBC :
-
Ubiquitin-conjugating enzyme E2
- ARF :
-
ADP-ribosylation factor
- TI :
-
Triosephosphate isomerase
- RTP :
-
Retrotransposon protein
- Ppcti :
-
Peptidyl-prolyl cis-trans isomerase
- Edf :
-
Endothelial differentiation factor
- PtfS :
-
Protein translation factor SUI1
- UV:
-
Ultraviolet
- 6BA:
-
6-Benzylamino purine
- IAA:
-
Indole-3-acetic acid
- ABA:
-
Abscisic acid
- GA:
-
Gibberellic acid
- SA:
-
Salicylic acid
- H40:
-
Heat of 40 °C
- Cold4:
-
Cold of 4 °C
- Sub:
-
Submergence
- PEG:
-
Polyethylene glycol
- Dr:
-
Drought
- UV-B:
-
Ultraviolet-B
- RSLP:
-
Root, stem, leaf, and panicle
- Tm:
-
Melting temperature
- V:
-
Pairwise variation
- SD:
-
Standard deviation
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Acknowledgments
We thank Prof. Dr. Zhihong Zhang for providing the rice blast isolate. This work was supported by Key Grant Project of Chinese Ministry of Education (Grant No. 313039), the Specialized Research Fund for the Doctoral Program of Higher Education (20130141110069), and the National Program of Transgenic Variety Development of China (Grant No. 2011ZX08001-001 and 2011ZX08001-004).
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Fig S1
Specificity of the amplicons for eleven reference genes. (a) The melting curve analysis showed a specific peak for each reference gene. (b) A 4 % agarose gel electrophoresis showed amplicons with expected sizes (JPG 615 kb)
Fig S2
Ct values of 22 tissue samples for eleven candidate reference genes. Cross dot represents the average Ct value of a single sample with three replicates. And the black horizontal line represents the mean Ct value of 22 tissue samples for each gene. The threshold of Ct values was the same for every gene (JPG 133 kb)
Fig S3
Ranking the best combinations of multiple reference genes for hormone groups. Arrow indicated the best combination of multiple reference genes for (a) hormones, (b) 6BA, (c) IAA, (d) GA, (e) SA, (f) ABA. (g) Arrow indicated the optimal number of reference genes (JPG 378 kb)
Fig S4
Ranking the best combinations of multiple reference genes for environmental factor groups. Arrow indicated the best combination of multiple reference genes for (a) environmental factors, (b) cold4, (c) H40, (d) Sub, (e) Dr, (f) NaCl, (g) PEG. (h) Arrow indicated the optimal number of reference genes (JPG 426 kb)
Fig S5
Ranking the best combinations of multiple reference genes for three other groups. Arrow indicated the best combination of multiple reference genes for (a) wound, (b) rice blast, (c) UV-B. (d) Arrow indicated the optimal number of reference genes (JPG 245 kb)
Fig S6
Relative expression of LOC_Os04g08764 in tissue groups and stresses groups. Relative expression of LOC_Os04g08764 were obtained when normalized with the best combination of multiple reference genes by geNorm for each specific group (from Fig. 1 and Fig S3-5). (a) group of 22 tissue samples; (b) five specific tissue groups: leaf, panicle, spikelets, RSLP, and floret and grain; (c) five specific hormone groups: 6BA, IAA, GA, SA and ABA; (d) six specific environmental factors groups: H40, Cold4, NaCl, PEG, Dr and Sub; (e) another three groups: wound, rice blast and UV-B. The ordinate axis presented normalized relative expression value, and the abscissa axis listed samples of each group. Groups were listed in Supplementary Table S1 and details about samples were described in the section of materials and methods. Expression level of the fist sample in each group was normalized to 1. Bar value represented standard deviation (JPG 627 kb)
Fig S7
Evaluation of stability for combinations of multiple reference genes and each single reference gene in rest tissue groups. (a) leaf, (b) panicle, (c) floret and grain. The figure legend can refer to that of Fig. 2 (JPG 458 kb)
Fig S8
Evaluation of stability for combinations of multiple reference genes and each single reference gene in rest hormone groups. (a) IAA, (b) SA, (c) ABA. The figure legend can refer to that of Fig. 2 (JPG 448 kb)
Fig S9
Evaluation of stability for combinations of multiple reference genes and each single reference gene in rest environmental factor groups. (a) Sub, (b) Dr, (c) NaCl, (d) PEG. The figure legend can refer to that of Fig. 2 (JPG 572 kb)
Fig S10
Evaluation of stability for the combination of multiple reference genes and each single reference gene in three other groups. (a) wound, (b) rice blast, (c) UV-B. The figure legend can refer to that of Fig. 2 (JPG 446 kb)
Table S1
Twenty-two groups for stability analysis of reference genes. Details about every sample were described in the section of materials and methods (DOCX 15 kb)
Table S2
Arrangement of eleven candidate reference genes by M values of geNorm and stability values of NormFinder for 19 specific groups. (DOCX 27 kb)
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Wang, Z., Wang, Y., Yang, J. et al. Reliable Selection and Holistic Stability Evaluation of Reference Genes for Rice Under 22 Different Experimental Conditions. Appl Biochem Biotechnol 179, 753–775 (2016). https://doi.org/10.1007/s12010-016-2029-4
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DOI: https://doi.org/10.1007/s12010-016-2029-4