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Normalization matters: tracking the best strategy for sperm miRNA quantification.

Celia Corral-Vazquez1, Joan Blanco1, Albert Salas-Huetos1

  • 1Genetics of Male Fertility Group, Unitat de Biologia Cel·lular (Facultat de Biociències), Universitat Autònoma de Barcelona, Cerdanyola del Vallès 08193, Spain.

Molecular Human Reproduction
|December 10, 2016
PubMed
Summary
This summary is machine-generated.

The optimal normalization strategy for sperm microRNA (miRNA) quantitative Reverse Transcription Polymerase Chain Reactions (qRT-PCR) involves using the average expression of hsa-miR-100-5p and hsa-miR-30a-5p. This approach ensures reliable data analysis in reproductive genetics research.

Keywords:
infertilitymiRNAnormalizationqRT-PCRsperm

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Area of Science:

  • Reproductive Genetics
  • Molecular Biology
  • Biomarker Discovery

Background:

  • Accurate normalization is crucial for reliable sperm microRNA (miRNA) quantitative Reverse Transcription Polymerase Chain Reactions (qRT-PCR) analysis.
  • Existing high-throughput expression analyses utilize mean-centering methods, but singleplex assays require specific reference controls.

Purpose of the Study:

  • To identify the most reliable normalization strategy for sperm miRNA qRT-PCR using singleplex assays.
  • To evaluate the performance of different normalization approaches against a reference method (MCR).

Main Methods:

  • Sperm miRNA qRT-PCR data from 736 miRNAs were analyzed using four normalization strategies: Mean-Centering Restricted (MCR), RNU6B, four selected miRNAs (hsa-miR-100-5p, hsa-miR-146b-5p, hsa-miR-92a-3p, hsa-miR-30a-5p), and a combination of two miRNAs.
  • Normalizer reliability was assessed based on expression ubiquity, uniformity, and proximity to MCR, evaluating differentially expressed miRNAs (DE-miRNAs), predicted targets, and enriched biological processes.

Main Results:

  • RNU6B normalization yielded significantly misguided results compared to MCR.
  • Normalization using hsa-miR-100-5p and hsa-miR-30a-5p, individually or in combination, showed the highest resemblance to MCR.
  • The combination of hsa-miR-100-5p and hsa-miR-30a-5p achieved the best performance in DE-miRNA detection, target prediction, and biological process enrichment.

Conclusions:

  • The average expression of hsa-miR-100-5p and hsa-miR-30a-5p is the optimal normalization strategy for sperm miRNA qRT-PCR singleplex assays.
  • This validated normalization approach can be universally applied to sperm miRNA expression studies, ensuring reliable biomarker discovery.
  • Normalization using RNU6B should be avoided in sperm miRNA expression studies due to unreliable results.