Dysregulation of Grainyhead-like 3 expression causes widespread developmental defects
Zihao Deng1, Tariq Butt1, Benedicta D Arhatari2,3
1Department of Medicine (Alfred Hospital), Central Clinical School, Monash University, Melbourne, Victoria, Australia.
Summary
Altering Grainyhead-like 3 (Grhl3) gene expression in mice causes severe developmental defects, including hearing loss and skin abnormalities, highlighting its critical role in development.
Area of Science:
- Developmental biology
- Genetics
- Mammalian development
Background:
- Grainyhead-like 3 (Grhl3) is crucial for mammalian development and homeostasis.
- Loss of Grhl3 causes spina bifida, syndactyly, skin barrier defects, and embryonic lethality.
- Understanding Grhl3 gain-of-function effects has been challenging.
Purpose of the Study:
- To investigate the consequences of Grhl3 gain-of-function in a novel mouse model.
- To analyze developmental anomalies resulting from dysregulated Grhl3 expression.
Main Methods:
- Generated a novel mouse model with a Grhl3 transgene at the Rosa26 locus on a Grhl3-null background.
- Observed and analyzed phenotypes in mice with rescued and dysregulated Grhl3 expression.
- Utilized Micro-CT scanning to examine inner ear structures.
Main Results:
- Transgenic Grhl3 expression rescued Grhl3-null defects, enabling adult survival.
- Homozygous transgene expression led to a severe Shaker-Waltzer phenotype and hearing impairment.
- Observed structural inner ear alterations, hair loss, digit defects, and epidermal dysmorphogenesis.
Conclusions:
- Diverse developmental processes are highly sensitive to Grhl3 dosage.
- Dysregulation of Grhl3 leads to a spectrum of developmental abnormalities.
