Prioritization of Kidney Cell Types Highlights Myofibroblast Cells in Regulating Human Blood Pressure

Area of Science:

• Genetics
• Nephrology
• Cell Biology

Background:

• Blood pressure (BP) is a highly heritable trait with over 2000 identified genomic loci.
• The kidney's role in BP regulation is significant, yet specific cell types involved remain largely unknown.

Purpose of the Study:

• To identify specific cell types in the mature human kidney involved in the genetic regulation of blood pressure.
• To connect genome-wide association study (GWAS) results for BP to cellular-level data.

Main Methods:

• Applied stratified linkage disequilibrium score (LDSC) regression.
• Utilized large-scale BP GWAS data from up to 1,028,980 adults of European ancestry.
• Integrated single-cell transcriptomic data from 14 mature human kidneys.

Main Results:

• Prioritized myofibroblasts and endothelial cells among 33 annotated cell types for their involvement in BP regulation.
• Observed enrichment of heritability for systolic BP (SBP) in kidney cortex myofibroblasts.
• Found enrichment of heritability for diastolic BP (DBP) in endothelial cells (descending vasa recta, peritubular capillaries) and stromal myofibroblasts.
• Myofibroblasts were identified as a significant cell type for both BP traits, with findings replicated across multiple independent datasets and species.

Conclusions:

• Myofibroblast cells play a crucial role in the genetic regulation of blood pressure.
• These findings provide a foundation for future research into the specific genes and mechanisms within myofibroblasts that control BP.
• Highlights the importance of cellular-level analysis in understanding complex heritable traits like blood pressure.