This report describes Costello syndrome (CSTLO); CSTLO exhibits autosomal dominant inheritance. The human gene implicated in this disease is HRAS, one of three closely related RAS proteins in human. The RAS proteins are GDP/GTP-binding proteins that act as intracellular signal transducers and are crucial players in many signaling networks affecting normal cell growth. There is a single high-scoring ortholog in Drosophila, Ras85D, for which classical amorphic and hypomorphic alleles, RNAi-targeting constructs, and alleles caused by insertional mutagenesis have been generated. There are multiple other paralogous and orthologous genes in both species.
A UAS construct of the human Hsap\HRAS gene carrying a variant implicated in Costello syndrome has been introduced into flies. Variant(s) implicated in human disease tested (as transgenic human gene, HRAS): the G12S variant form has been introduced into flies. Experiments using this variant include assessments of pharmaceutical candidates.
See also the human disease model report 'cancer, multiple, RAS-related' (FBhh0000474).
[updated May 2021 by FlyBase; FBrf0222196]
[COSTELLO SYNDROME; CSTLO](https://omim.org/entry/218040)
[HRAS PROTOONCOGENE, GTPase; HRAS](https://omim.org/entry/190020)
Costello syndrome is a rare multiple congenital anomaly syndrome associated in all cases with a characteristic coarse facies, short stature, distinctive hand posture and appearance, severe feeding difficulty, and failure to thrive. Other features include cardiac anomalies and developmental disability. Facial warts, particularly nasolabial, are often present in childhood (Kerr et al., 2006; pubmed:16443854). [from MIM:218040; 2021.05.08]
Costello syndrome (CSTLO) is caused by heterozygous mutation in the HRAS gene. [from MIM:218040; 2021.05.08]
The RAS proteins are members of a large superfamily of low-molecular-weight GTP-binding proteins. The RAS proteins control signaling pathways that are key regulators of several aspects of normal cell growth and malignant transformation. Three members of the RAS family, HRAS, KRAS and NRAS, are found to be activated by mutation in human tumors. These three members are very closely related, having 85% amino acid sequence identity (Downward, 2003; pubmed:12509763).
Many to many: multiple paralogs and orthologs in both species.