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Reference gene validation for qPCR in rat carotid body during postnatal development
Insook Kim1, Dongjin Yang, Xinyu Tang
1University of Arkansas for Medical Sciences, Department of Pediatrics, Division of Pulmonary Medicine, Arkansas Children's Hospital Research Institute, Little Rock, Arkansas, USA. carrolljohnl@uams.edu.
BMC Research Notes
|October 26, 2011
Summary
Selecting stable reference genes for carotid body development studies is crucial. 18s rRNA and actin are unstable under varying oxygen conditions, necessitating careful gene selection for accurate qPCR analysis.
Area of Science:
- Physiology
- Molecular Biology
- Developmental Biology
Background:
- Carotid bodies are key arterial oxygen sensors in mammals, vital for respiratory and cardiovascular regulation.
- Afferent neural output from carotid bodies mediates protective responses to hypoxia.
- Accurate gene expression analysis using quantitative real-time PCR (qPCR) requires validated reference genes.
Purpose of the Study:
- To identify the most stable reference genes for studying rat carotid body development.
- To evaluate commonly used reference genes under different postnatal developmental stages and oxygen conditions.
Main Methods:
- Six reference genes (β-actin, RPII, PPIA, TBP, GAPDH, 18s rRNA) were assessed in rat carotid bodies.
- Experiments included two age groups (neonatal and juvenile) and three oxygen conditions (normoxia, hypoxia, hyperoxia).
- Gene stability was analyzed using geNorm, NormFinder, and BestKeeper software.
Main Results:
- Reference gene stability varied significantly between programs and experimental conditions.
- 18s rRNA was consistently the least stable reference gene.
- Actin also showed instability, particularly under altered oxygen conditions (hypoxia/hyperoxia).
Conclusions:
- Reference gene expression in the carotid body is influenced by developmental stage and environmental oxygen levels.
- The selection of reference genes for carotid body development studies must consider these variables.
- 18s rRNA and actin are potentially unsuitable for qPCR studies of carotid body maturation, especially with varying oxygen exposure.
