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Published on: September 1, 2015
Unraveling the Genetic Links Between Polycystic Kidney Disease and Hypertension Through ARL13B
Juan Chen1, Lei Song2, Shuqin Mei1
1Kidney Institute, Division of Nephrology, Shanghai Changzheng Hospital, Second Military Medical University (Naval Medical University), Shanghai, People's Republic of China.
Insights
Autosomal dominant polycystic kidney disease (ADPKD) and hypertension have a bidirectional causal relationship. Elevated ARL13B gene expression in ADPKD suggests cilia dysfunction may contribute to renal hypertension.
Area of Science:
- Genetics
- Nephrology
- Cardiovascular Disease
Background:
- Autosomal dominant polycystic kidney disease (ADPKD) is the most common inherited kidney disorder.
- ADPKD is frequently associated with hypertension, creating a potentially detrimental feedback loop.
- Understanding the genetic interplay between ADPKD and hypertension is crucial for effective management.
Purpose of the Study:
- To investigate the causal relationship between ADPKD and hypertension using a bidirectional Mendelian randomization (MR) design.
- To explore the underlying genetic mechanisms connecting these two conditions.
- To identify potential therapeutic targets by analyzing gene expression patterns.
Main Methods:
- Utilized a bidirectional MR approach with genetic data from large-scale Genome-Wide Association Studies (GWAS) for ADPKD and hypertension.
- Employed bioinformatics tools (FUMA) for genetic annotation and enrichment analysis of single nucleotide polymorphisms (SNPs).
- Analyzed gene expression data from the GEO database and performed quantitative PCR (RT-PCR) for ARL13B mRNA levels in kidney tissues and cell lines.
Main Results:
- MR analysis confirmed a causal effect of ADPKD on hypertension (OR=1.011) and a reverse causal effect of hypertension on ADPKD (OR=1.195).
- No significant heterogeneity or pleiotropy was observed, strengthening the causal inference.
- Genetic analysis identified 27 PKD-associated genes, with functional enrichment pointing to ARL13B involvement in cilia function.
- Significantly elevated ARL13B mRNA levels were found in human ADPKD kidneys and cystic cell lines.
Conclusions:
- Established a bidirectional causal link between ADPKD and hypertension.
- Highlighted the potential role of cilia dysfunction, indicated by elevated ARL13B expression, in the pathogenesis of renal hypertension associated with ADPKD.
- Suggests that cilia-related pathways are important targets for future research and therapeutic interventions in ADPKD-related hypertension.
Background:
Autosomal dominant polycystic kidney disease (ADPKD), the most common inherited kidney disorder, is frequently accompanied by hypertension, with each condition potentially exacerbating the other. This study employs a bidirectional Mendelian randomization (MR) design to investigate the causal relationship between PKD and hypertension, alongside bioinformatics analyses to explore underlying genetic mechanisms.
Methods:
Genetic data for PKD and hypertension were obtained from the International Epidemiology Unit (IEU) Genome-Wide Association Study (GWAS) database. A bidirectional MR analysis was performed using nucleotide polymorphisms (SNPs) strongly associated with PKD and hypertension. Genetic annotation and enrichment analysis of SNPs were conducted using the Functional Mapping and Annotation (FUMA) platforms. Gene expression differences between PKD and controls were studied using the GEO database and single-cell data analysis tools. Quantitative PCR analysis of ARL13B mRNA levels in normal renal tubular epithelial cells (RCTEC), renal cystic epithelial cells (WT9-12), and ADPKD kidney tissues.
Results:
MR analysis demonstrated a causal effect of PKD on hypertension (IVW: P=0.038; OR=1.011; 95% CI: 1.001-1.021) and a reverse causal effect of hypertension on PKD (IVW: P=0.042; OR=1.195; 95% CI: 1.007-1.420). No significant heterogeneity or pleiotropy was detected. Genetic annotation identified 27 PKD genes closely associated with hypertension. Among them, functional enrichment analysis indicated ARL13B was involved in cilia morphology and dysfunction. Notably, RT-PCR results showed that ARL13B mRNA expression was significantly elevated in human ADPKD kidneys (P<0.001) and WT9-12 cells (P<0.05).
Conclusion:
Our bidirectional MR study demonstrated a causal effect of PKD on hypertension and a reverse influence of hypertension on PKD progression. Elevated ARL13B expression in ADPKD suggested a possible involvement of cilia-related pathways in the development of renal hypertension.
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