FB2026_02 , released June 18, 2026
Human Disease Model Report: cardiofaciocutaneous syndrome 4
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General Information
Name
cardiofaciocutaneous syndrome 4
FlyBase ID
FBhh0001511
Overview

This report describes cardiofaciocutaneous syndrome 4 (CFC4); CFC4 exhibits autosomal dominant inheritance. The human gene implicated in this disease is MAP2K2 (Mitogen-Activated Protein Kinase Kinase 2, also known as MEK2), a dual-specificity protein kinase that is a component of the MAP kinase signal transduction pathway. There is a single fly ortholog, Dsor1, for which multiple genetic reagents, including classical amorphic and hypomorphic alleles, RNAi-targeting constructs, and alleles caused by insertional mutagenesis, have been generated. Dmel\Dsor1 is also orthologous to the human gene MAP2K1; MAP2K1 is also implicated in cardiofaciocutaneous syndrome (in this case, CFS3).

The human MAP2K2 gene has not been introduced into flies.

Several disease-implicated variants associated with cardiofaciocutaneous syndrome have been investigated in Drosophila using the fly gene Dsor1; see the 'Disease-implicated Variants' table below. Dsor1 is the sole high-scoring fly ortholog of both MAP2K1 and MAP2K2 and both of these human genes are implicated in cardiofaciocutaneous syndrome. In some cases a characterized Dsor1 mutation is analogous to disease-implicated variants in both genes. For example, Y149C in the fly Dsor1 gene corresponds to Y130C in the human MAP2K1 gene, which is implicated in CFC3, and Y134C in the human MAP2K2 gene, which is implicated in CFC4.

Additional information can be found in the Human Disease Model report 'RASopathies, MAP2K1,2-related' (FBhh0001509).

[updated Apr. 2023 by FlyBase; FBrf0222196]

Disease Summary Information
Parent Disease Summary: cardiofaciocutaneous syndrome
Symptoms and phenotype

Cardiofaciocutaneous syndrome is a disorder that affects many parts of the body, particularly the heart (cardio-), facial features (facio-), and the skin and hair (cutaneous). People with this condition also have delayed development and intellectual disability, usually ranging from moderate to severe. Infants with cardiofaciocutaneous syndrome typically have weak muscle tone (hypotonia), feeding difficulties, and a failure to grow and gain weight at the normal rate (failure to thrive). The symptoms of cardiofaciocutaneous syndrome overlap significantly with those of two other genetic conditions, Costello syndrome and Noonan syndrome. [MedlinePlus, Cardiofaciocutaneous syndrome; 2023.04.07]

Cardiofaciocutaneous (CFC) syndrome is a multiple congenital anomaly disorder characterized by a distinctive facial appearance, heart defects, and mental retardation (summary by Niihori et al., 2006; pubmed:16474404). [from MIM:115150; 2023.04.07]

Specific Disease Summary: cardiofaciocutaneous syndrome 4
OMIM report

[CARDIOFACIOCUTANEOUS SYNDROME 4; CFC4](https://omim.org/entry/615280)

Human gene(s) implicated

[MITOGEN-ACTIVATED PROTEIN KINASE KINASE 2; MAP2K2](https://omim.org/entry/601263)

Symptoms and phenotype
Genetics

Cardiofaciocutaneous syndrome-4 (CFC4) is caused by heterozygous mutation in the MAPK2K2 gene. [from MIM:615280; 2023.04.07]

Cellular phenotype and pathology
Molecular information

MAP2K2 encodes is a dual-specificity protein kinase that belongs to the MAP kinase kinase family. This kinase is known to play a critical role in mitogen growth factor signal transduction. [Gene Cards, MAP2K2; 2023.04.08]

External links
Disease synonyms
CFC4
Search term: RASopathy
Ortholog Information
Human gene(s) in FlyBase
    Human gene (HGNC)
    D. melanogaster ortholog (based on DIOPT)
    Comments on ortholog(s)

    Many to one: 2 human genes to 1 Drosophila gene.

    Other mammalian ortholog(s) used
      D. melanogaster Gene Information (1)
      Gene Snapshot
      Downstream of raf1 (Dsor1) encodes a serine/threonine kinase that phosphorylates MAP kinase. It is activated by the product of Raf and acts downstream of receptor tyrosine kinases such as those encoded by tor, Egfr, and sev. [Date last reviewed: 2019-03-07]
      Cellular component (GO)
      Comments on ortholog(s)

      High-scoring ortholog of human MAP2K1 and MAP2K2 (1 Drosophila to 2 human).

      Orthologs and Alignments from DRSC
      DIOPT - DRSC Integrative Ortholog Prediction Tool - Click the link below to search for orthologs in Humans
      Other Genes Used: Viral, Bacterial, Synthetic (0)
        Summary of Physical Interactions (78 groups)
        protein-protein
        Interacting group
        Assay
        References
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        proximity ligation assay, fluorescence microscopy
        anti tag coimmunoprecipitation, peptide massfingerprinting
        pull down, anti tag western blot, electron microscopy, molecular sieving, molecular weight estimation by staining
        anti tag coimmunoprecipitation, anti tag western blot
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        electron microscopy, pull down, anti tag western blot, anti tag coimmunoprecipitation, peptide massfingerprinting, molecular sieving, molecular weight estimation by staining
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        experimental knowledge based
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, anti tag western blot
        anti tag coimmunoprecipitation, peptide massfingerprinting, molecular sieving, molecular weight estimation by staining, anti tag western blot, electron microscopy
        anti tag coimmunoprecipitation, peptide massfingerprinting
        pull down, autoradiography
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, anti tag western blot
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        experimental knowledge based
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting, anti tag western blot, two hybrid
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, western blot, proximity ligation assay, fluorescence microscopy
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting, anti tag western blot
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        experimental knowledge based
        anti tag coimmunoprecipitation, peptide massfingerprinting
        anti tag coimmunoprecipitation, peptide massfingerprinting
        Alleles Reported to Model Human Disease (Disease Ontology) (20 alleles)
        Models Based on Experimental Evidence ( 12 )
        Modifiers Based on Experimental Evidence ( 9 )
        Alleles Representing Disease-Implicated Variants
        Genetic Tools, Stocks and Reagents
        Sources of Stocks
        Contact lab of origin for a reagent not available from a public stock center.
        Bloomington Stock Center Disease Page
        Related mammalian, viral, bacterial, or synthetic transgenes
        Allele
        Transgene
        Publicly Available Stocks
        Selected Drosophila transgenes
        Allele
        Transgene
        Publicly Available Stocks
        RNAi constructs available
        Allele
        Transgene
        Publicly Available Stocks
        Selected Drosophila classical alleles
        Allele
        Allele class
        Mutagen
        Publicly Available Stocks
        loss of function allele
        CRISPR/Cas9
        CRISPR/Cas9
        CRISPR/Cas9
        ethyl methanesulfonate
        amorphic allele - genetic evidence
        References (4)