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Ras/MAPK dysregulation in development causes a skeletal myopathy in an activating BrafL597V mouse model for cardio‐facio‐cutaneous syndrome

Cardio‐facio‐cutaneous (CFC) syndrome is a human multiple congenital anomaly syndrome that is caused by activating heterozygous mutations in either BRAF, MEK1, or MEK2, three protein kinases of the Ras/mitogen‐activated protein kinase (MAPK) pathway. CFC belongs to a group of syndromes known as RASopathies. Skeletal muscle hypotonia is a ubiquitous phenotype of RASopathies, especially in CFC syndrome. To better understand the underlying mechanisms for the skeletal myopathy in CFC, a mouse model with an activating BrafL597V allele was utilized.