Ripply1 is a gene encoding a nuclear protein associated with the transcriptional corepressor Groucho. It is involved in multiple biological processes such as the transition from the presomitic mesoderm to somites, skeletal myogenesis, and the rostro-caudal patterning within a somite. It is part of gene networks including Tbx6 and Mesp-b, and is crucial for somitogenesis and muscle development [1,2,3].

In zebrafish, ripply1-deficient embryos fail to form somite boundaries, and the characteristic gene expression in the presomitic mesoderm is not properly terminated [3]. In these embryos, persistent Tbx6 expression due to Ripply1 knockdown correlates with a deficit in dermomyotome and myotome marker gene expression, suggesting Ripply1 promotes myogenesis by terminating Tbx6-dependent inhibition of myogenic maturation [1]. In Ripply1/2-deficient mouse embryos, abnormal expansion of Mesp2 and Tbx6 protein domains is observed, indicating that Ripply1/2 regulate Mesp2 expression by modulating Tbx6 protein elimination, which is important for rostro-caudal patterning [2].

In conclusion, Ripply1 is essential for processes like somitogenesis and myogenesis. Studies using gene-knockout models in zebrafish and mice have revealed its role in regulating gene expression patterns related to these processes. These findings contribute to understanding the molecular mechanisms underlying embryonic development and may have implications for related congenital disorders such as congenital scoliosis where Ripply1 variants have been identified [4].