Genetic mutation of Frem3 does not causeFraser syndrome in mice

Area of Science:

• Developmental biology
• Genetics
• Extracellular matrix research

Background:

• QBRICK, FRAS1, and FREM2 are extracellular matrix proteins with CSPG repeats and Calx-β motifs.
• Their dysfunction is linked to Fraser syndrome, a congenital disorder affecting skin, eyes, digits, and kidneys.
• FREM3 is also part of the 12-CSPG protein family, but its role in Fraser syndrome is unknown.

Purpose of the Study:

• To investigate the potential role of FREM3 dysfunction in causing Fraser syndrome or other developmental disorders.
• To analyze the phenotype of a genetically engineered Frem3 mutant mouse line.

Main Methods:

• CRISPR/Cas9-mediated genome editing was used to create a Frem3 mutant mouse line.
• Homozygous mutant mice were born at expected Mendelian ratios.
• Phenotypic analysis was performed to identify any Fraser syndrome-like defects.

Main Results:

• Frem3 mutant homozygotes were viable and born at the expected Mendelian ratio.
• No developmental defects characteristic of Fraser syndrome were observed in the mutant mice.
• These findings suggest FREM3 is not implicated in Fraser syndrome.

Conclusions:

• The dysfunction of FREM3 is not associated with Fraser syndrome.
• Further research may be needed to determine the specific function of FREM3 in development.