Determinants of renin cell differentiation: a single cell epi-transcriptomics approach

Area of Science:

• Developmental Biology
• Renal Physiology
• Molecular Biology

Background:

• Renin cells are vital for regulating blood pressure and fluid balance.
• Understanding renin cell differentiation from FoxD1+ progenitors is crucial but challenging due to their rarity.
• Aberrant renin-angiotensin system (RAS) activity contributes to cardiovascular and kidney diseases.

Approach:

• Integrated single-nucleus RNA sequencing (scRNA-seq) and single-cell Assay for Transposase-Accessible Chromatin sequencing (scATAC-seq) were employed.
• Developmental trajectories of kidney vascular cells, including renin cells, were mapped from embryonic to adult stages.
• Chromatin accessibility and transcription factor binding were analyzed to identify regulatory mechanisms.

Key Points:

• The study provides the first single-cell developmental atlas of kidney vascular open chromatin, detailing renin cell differentiation into juxtaglomerular (JG) cells.
• The role of Nfix in JG cell development and renin expression was confirmed.
• The myocyte enhancer factor-2 (MEF2) family of transcription factors was identified as putative drivers of JG cell differentiation.

Conclusions:

• This research elucidates the regulatory landscape of renin-expressing JG cells, offering novel insights into their stage-specific differentiation.
• The findings are essential for understanding the control and function of this rare cell population.
• Improved knowledge of renin cell regulation may lead to better therapeutic strategies for RAS-related pathologies.