High-throughput discovery of novel developmental phenotypes

Area of Science:

• Genetics
• Genomics
• Developmental Biology

Background:

• Approximately one-third of mammalian genes are essential for life.
• Gene knockouts in mice are crucial for understanding gene function and congenital disorders.

Purpose of the Study:

• To identify lethal genes and their associated phenotypes during the generation of knockout mouse lines.
• To investigate the prevalence of incomplete penetrance and variable expressivity in essential genes.
• To determine if human disease genes are enriched for essential genes.

Main Methods:

• Generation and phenotypic characterization of 1,751 unique gene knockouts in mice.
• Utilization of a standardized phenotyping platform with high-resolution 3D imaging.
• Analysis of phenotypes at multiple time points.

Main Results:

• Identification of 410 essential lethal genes.
• Discovery of previously uncharacterized gene phenotypes and additional phenotypes for known genes.
• Observation of common incomplete penetrance and variable expressivity, even in a defined genetic background.

Conclusions:

• Essential genes are critical for mammalian life, and their study provides insights into congenital disorders.
• The study provides a valuable dataset for prioritizing and validating mutations in human disease gene discovery.
• Incomplete penetrance and variable expressivity are common phenomena in essential genes.