The channel kinase, TRPM7, is required for early embryonic development

Area of Science:

• Developmental Biology
• Molecular and Cellular Biology
• Genetics

Background:

• Global disruption of Trpm7 in mice leads to early embryonic lethality.
• Understanding the specific developmental roles and temporal requirements of Trpm7 is essential.

Purpose of the Study:

• To investigate the tissue-specific and temporal requirements of Trpm7 during mouse embryogenesis.
• To elucidate the role of Trpm7 in kidney, neural crest, and brain development.
• To examine Trpm7 function in induced pluripotent stem cells (iPSCs) and neural stem (NS) cells.

Main Methods:

• Utilized tamoxifen-inducible Trpm7 disruption in conjunction with various Cre recombinase lines.
• Analyzed developmental defects in vivo across different embryonic stages and tissues.
• Generated and characterized Trpm7-disrupted iPSCs and NS cells for in vitro studies.

Main Results:

• Trpm7 deletion during organogenesis caused severe, tissue-specific developmental defects.
• Trpm7 is essential for kidney development originating from the metanephric mesenchyme, but not the ureteric bud.
• Early Trpm7 disruption in neural crest cells led to the loss of pigment cells and dorsal root ganglion neurons; late disruption in the brain had no effect.
• Trpm7 disruption in iPSCs prevented NS cell monolayer formation during differentiation, while Trpm7(-/-) NS cells maintained self-renewal and differentiation potential.

Conclusions:

• Trpm7 exhibits a critical temporal requirement during embryogenesis, impacting multiple developmental processes.
• The Trpm7 channel kinase plays indispensable roles in kidney and neural crest development.
• Trpm7 is crucial for early stages of neural stem cell differentiation from iPSCs.