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Optimizations for identifying reference genes in bone and cartilage bioengineering

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Abstract

Background: Reverse transcription quantitative real-time polymerase chain reaction (RT-qPCR) remains one of the best-established techniques to assess gene expression patterns. However, appropriate reference gene(s) selection remains a critical and challenging subject in which inappropriate reference gene selction can distort results leading to false interpretations. To date, mixed opinions still exist in how to choose the most optimal reference gene sets in accodrance to the Minimum Information for Publication of Quantitative Real-Time PCR Experiments (MIQE) guideline. Therefore, the purpose of this study was to investigate which schemes were the most feasible for the identification of reference genes in a bone and cartilage bioengineering experimental setting. In this study, rat bone mesenchymal stem cells (rBMSCs), skeletal muscle tissue and adipose tissue were utilized, undergoing either chondrogenic or osteogenic induction, to investigate the optimal reference gene set identification scheme that would subsequently ensure stable and accurate interpretation of gene expression in bone and cartilage bioengineering. Results: The stability and pairwise variance of eight candidate reference genes were analyzed using geNorm. The V 0.15 - vs. V min -based normalization scheme in rBMSCs had no significant effect on the eventual normalization of target genes. In terms of the muscle tissue, the results of the correlation of NF values between the V 0.15 and V min schemes and the variance of target genes expression levels generated by these two schemes showed that different schemes do indeed have a significant effect on the eventual normalization of target genes. Three selection schemes were adopted in terms of the adipose tissue, including the three optimal reference genes (Opt 3 ), V 0.20 and V min schemes, and the analysis of NF values with eventual normalization of target genes showed that the different selection schemes also have a significant effect on the eventual normalization of target genes. Conclusions: Based on these results, the proposed cut-off value of Vn/n + 1 under 0.15, according to the geNorm algorithm, should be considered with caution. For cell only experiments, at least rBMSCs, a Vn/n + 1 under 0.15 is sufficient in RT-qPCR studies. However, when using certain tissue types such as skeletal muscle and adipose tissue the minimum Vn/n + 1 should be used instead as this provides a far superior mode of generating accurate gene expression results. We thus recommended that when the stability and variation of a candidate reference genes in a specific study is unclear the minimum Vn/n + 1 should always be used as this ensures the best and most accurate gene expression value is achieved during RT-qPCR assays.

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Fig. 1 V0.15- vs. Vmin-based normalization scheme for gene expression assay in rBMSCs undergoing osteogenic differentiation. a Pairwise variation (Vn/n + 1) analysis between NFn and NFn + 1 to determine the optimal number of reference genes required for accurate normalization, V0.15 = 0.078, Vmin = 0.055; b The sequencing of eight candidate reference genes based on M value; c Scatter plots of NFs between V0.15 and Vmin-based scheme (r = Spearman rank correlation coefficient); d The comparison of target gene expression levels (CNRQ) using either the V0.15 or Vmin-based scheme. rBMSCs, rat bone marrow mesenchymal stem cells; NF, normalization factor; CNRQ, calibrated normalized relative quantity
Fig. 1 V0.15- vs. Vmin-based normalization scheme for gene expression assay in rBMSCs undergoing osteogenic differentiation. a Pairwise variation (Vn/n + 1) analysis between NFn and NFn + 1 to determine the optimal number of reference genes required for accurate normalization, V0.15 = 0.078, Vmin = 0.055; b The sequencing of eight candidate reference genes based on M value; c Scatter plots of NFs between V0.15 and Vmin-based scheme (r = Spearman rank correlation coefficient); d The comparison of target gene expression levels (CNRQ) using either the V0.15 or Vmin-based scheme. rBMSCs, rat bone marrow mesenchymal stem cells; NF, normalization factor; CNRQ, calibrated normalized relative quantityCC BY · PubMed Central
Fig. 2 V0.15- vs. Vmin-based normalization scheme for gene expression assay in rBMSCs undergoing chondrogenic differentiation. a Pairwise variation (Vn/n + 1) analysis between NFn and NFn + 1 to determine the optimal number of reference genes required for accurate normalization, V0.15 = 0.068, Vmin = 0.058; b The sequencing of eight candidate reference genes based on M value; c Scatter plots of NFs between V0.15 and Vmin-based scheme (r = Spearman rank correlation coefficient). b The comparison of target gene expression levels (CNRQ) using either the V0.15 or Vmin-based scheme. rBMSCs, rat bone marrow mesenchymal stem cells; NF, normalization factor; CNRQ, calibrated normalized relative quantity
Fig. 2 V0.15- vs. Vmin-based normalization scheme for gene expression assay in rBMSCs undergoing chondrogenic differentiation. a Pairwise variation (Vn/n + 1) analysis between NFn and NFn + 1 to determine the optimal number of reference genes required for accurate normalization, V0.15 = 0.068, Vmin = 0.058; b The sequencing of eight candidate reference genes based on M value; c Scatter plots of NFs between V0.15 and Vmin-based scheme (r = Spearman rank correlation coefficient). b The comparison of target gene expression levels (CNRQ) using either the V0.15 or Vmin-based scheme. rBMSCs, rat bone marrow mesenchymal stem cells; NF, normalization factor; CNRQ, calibrated normalized relative quantityCC BY · PubMed Central
Fig. 3 V0.15- vs. Vmin-based normalization scheme for gene expression assay on muscle tissue undergoing osteogenic differentiation. a Pairwise variation (Vn/n + 1) analysis between NFn and NFn + 1 to determine the optimal number of reference genes required for accurate normalization, V0.15 = 0.108, Vmin = 0.067; b The sequencing of eight candidate reference genes based on M value; c Scatter plots of NFs between V0.15 and Vmin-based scheme (r = Spearman rank correlation coefficient). d The comparison of target gene expression levels (CNRQ) using either the V0.15 or Vmin-based scheme. NF, normalization factor; CNRQ, calibrated normalized relative quantity
Fig. 3 V0.15- vs. Vmin-based normalization scheme for gene expression assay on muscle tissue undergoing osteogenic differentiation. a Pairwise variation (Vn/n + 1) analysis between NFn and NFn + 1 to determine the optimal number of reference genes required for accurate normalization, V0.15 = 0.108, Vmin = 0.067; b The sequencing of eight candidate reference genes based on M value; c Scatter plots of NFs between V0.15 and Vmin-based scheme (r = Spearman rank correlation coefficient). d The comparison of target gene expression levels (CNRQ) using either the V0.15 or Vmin-based scheme. NF, normalization factor; CNRQ, calibrated normalized relative quantityCC BY · PubMed Central
Fig. 4 V0.15- vs. Vmin-based normalization scheme for gene expression assay on muscle tissue undergoing chondrogenic differentiation. a Pairwise variation (Vn/n + 1) analysis between NFn and NFn + 1 to determine the optimal number of reference genes required for accurate normalization, V0.15 = 0.079, Vmin = 0.057; b The sequencing of eight candidate reference genes based on M value; c Scatter plots of NFs between V0.15 and Vmin-based scheme (r = Spearman rank correlation coefficient). d The comparison of target gene expression levels (CNRQ) using either the V0.15 or Vmin-based scheme. NF, normalization factor; CNRQ, calibrated normalized relative quantity
Fig. 4 V0.15- vs. Vmin-based normalization scheme for gene expression assay on muscle tissue undergoing chondrogenic differentiation. a Pairwise variation (Vn/n + 1) analysis between NFn and NFn + 1 to determine the optimal number of reference genes required for accurate normalization, V0.15 = 0.079, Vmin = 0.057; b The sequencing of eight candidate reference genes based on M value; c Scatter plots of NFs between V0.15 and Vmin-based scheme (r = Spearman rank correlation coefficient). d The comparison of target gene expression levels (CNRQ) using either the V0.15 or Vmin-based scheme. NF, normalization factor; CNRQ, calibrated normalized relative quantityCC BY · PubMed Central
Fig. 5 V0.20/Opt3− vs. Vmin-based normalization schemes for gene expression assay on adipose tissue undergoing osteogenic differentiation. a Pairwise variation (Vn/n + 1) analysis between NFn and NFn + 1 to determine the optimal number of reference genes required for accurate normalization, V0.20 = 0.194, V3/4 = 0.254, Vmin = 0.170; b The sequencing of eight candidate reference genes based on M value; c, e Scatter plots of NFs using three schemes (r = Spearman rank correlation coefficient). d, f The comparison of target gene expression levels (CNRQ) between V0.20/Opt3- and Vmin-based normalization schemes. NF, normalization factor; CNRQ, calibrated normalized relative quantity
Fig. 5 V0.20/Opt3− vs. Vmin-based normalization schemes for gene expression assay on adipose tissue undergoing osteogenic differentiation. a Pairwise variation (Vn/n + 1) analysis between NFn and NFn + 1 to determine the optimal number of reference genes required for accurate normalization, V0.20 = 0.194, V3/4 = 0.254, Vmin = 0.170; b The sequencing of eight candidate reference genes based on M value; c, e Scatter plots of NFs using three schemes (r = Spearman rank correlation coefficient). d, f The comparison of target gene expression levels (CNRQ) between V0.20/Opt3- and Vmin-based normalization schemes. NF, normalization factor; CNRQ, calibrated normalized relative quantityCC BY · PubMed Central
Fig. 6 V0.20/Opt3− vs. Vmin-based normalization schemes for gene expression assay on adipose tissue undergoing chondrogenic differentiation. a Pairwise variation (Vn/n + 1) analysis between NFn and NFn + 1 to determine the optimal number of reference genes required for accurate normalization, V0.20 = 0.181, V3/4 = 0.226, Vmin = 0.168; b The sequencing of eight candidate reference genes based on M value; c, e Selected scatterplots of normalization factors using three schemes (r = Spearman rank correlation coefficient). d, f The comparison of target gene expression levels (CNRQ) between V0.20/Opt3- and Vmin-based normalization schemes. NF, normalization factor; CNRQ, calibrated normalized relative quantity
Fig. 6 V0.20/Opt3− vs. Vmin-based normalization schemes for gene expression assay on adipose tissue undergoing chondrogenic differentiation. a Pairwise variation (Vn/n + 1) analysis between NFn and NFn + 1 to determine the optimal number of reference genes required for accurate normalization, V0.20 = 0.181, V3/4 = 0.226, Vmin = 0.168; b The sequencing of eight candidate reference genes based on M value; c, e Selected scatterplots of normalization factors using three schemes (r = Spearman rank correlation coefficient). d, f The comparison of target gene expression levels (CNRQ) between V0.20/Opt3- and Vmin-based normalization schemes. NF, normalization factor; CNRQ, calibrated normalized relative quantityCC BY · PubMed Central
Fig. 7 Schematic diagram on choosing the optimal normalization scheme for identifying proper reference genes. rBMSCs, rat bone marrow mesenchymal stem cells; RGs, reference genes; NF, normalization factor; CNRQ, calibrated normalized relative quantity
Fig. 7 Schematic diagram on choosing the optimal normalization scheme for identifying proper reference genes. rBMSCs, rat bone marrow mesenchymal stem cells; RGs, reference genes; NF, normalization factor; CNRQ, calibrated normalized relative quantityCC BY · PubMed Central

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Metadata

Authors
Xiong, F., Cheng, X., Zhang, C., Klar, R. M., & He, T.
Affiliations
  • Soochow University (CN)
  • Shanghai Jiao Tong University (CN)
  • LMU Klinikum (DE)
Corresponding author
  • Klar, Roland Manfred
  • He, Tao
Venue
BMC Biotechnology
Published
2021-03-17
Volume
21
Issue
1
Pages
25-25
ISSN
1472-6750 (ISSN-L)
OpenAlex
W3136910573
Cited by
12
References
2
Citations by year
2025: 2 · 2024: 2 · 2023: 2 · 2022: 3 · 2021: 3
FWCI
0.78
Type
journal article
Language
en
Open access
Locations
  • BMC Biotechnology (publishedVersion, cc-by)
  • Research Square (acceptedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
China Scholarship Council (201708140085)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Molecular Biology Techniques and Applications
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gene expression and cancer classification
  • Health Sciences › Health Professions › Medical Laboratory Technology › Clinical Laboratory Practices and Quality Control
Keywords
reference genes, qRT-PCR normalization, geNorm, gene expression stability, bone mesenchymal stem cells, chondrogenic differentiation, osteogenic differentiation, skeletal muscle, adipose tissue, MIQE guidelines, candidate reference genes
MeSH terms
Animals, Bone and Bones, Cartilage, Osteogenesis, Reference Standards, Chondrogenesis, Gene Expression Profiling, Rats, Bioengineering, Mesenchymal Stem Cells, Real-Time Polymerase Chain Reaction

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Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

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How to cite

Cite CoChat for the checks on this page, and the paper for its own findings.

This page
CoChat. (2026). Citation check: Optimizations for identifying reference genes in bone and cartilage bioengineering. https://app.cochat.ai/papers/10.1186/s12896-021-00685-8
The paper
Xiong, F., Cheng, X., Zhang, C., Klar, R. M., & He, T. (2021). Optimizations for identifying reference genes in bone and cartilage bioengineering. BMC Biotechnology. https://doi.org/10.1186/s12896-021-00685-8