Mutations in capillary morphogenesis gene-2 result in the allelic disorders juvenile hyaline fibromatosis and infantile systemic hyalinosis

Title

Mutations in capillary morphogenesis gene-2 result in the allelic disorders juvenile hyaline fibromatosis and infantile systemic hyalinosis

Creator

Dowling O; Difeo A; Ramirez MC; Tukel T; Narla G; Bonafe L; Kayserili H; Yuksel-Apak M; Paller AS; Norton K; Teebi AS; Grum-Tokars V; Martin GS; Davis GE; Glucksman MJ; Martignetti JA

Identifier

Publisher

American Journal Of Human Genetics

Date

2003

Subject

Child; Female; Humans; Male; Mutation; P.H.S.; Research Support; U.S. Gov't; Syndrome; infant; Models; Pedigree; Membrane Proteins/genetics; Base Sequence; Amino Acid Sequence; Exons; Genes; Recessive; Missense; Molecular; Chromosome Mapping; Fibroma/genetics; Genetic Markers; Focal/genetics; Glomerulosclerosis; Protein Conformation; Protein Structure; Secondary

Description

Juvenile hyaline fibromatosis (JHF) and infantile systemic hyalinosis (ISH) are autosomal recessive syndromes of unknown etiology characterized by multiple, recurring subcutaneous tumors, gingival hypertrophy, joint contractures, osteolysis, and osteoporosis. Both are believed to be allelic disorders; ISH is distinguished from JHF by its more severe phenotype, which includes hyaline deposits in multiple organs, recurrent infections, and death within the first 2 years of life. Using the previously reported chromosome 4q21 JHF disease locus as a guide for candidate-gene identification, we identified and characterized JHF and ISH disease-causing mutations in the capillary morphogenesis factor-2 gene (CMG2). Although CMG2 encodes a protein upregulated in endothelial cells during capillary formation and was recently shown to function as an anthrax-toxin receptor, its physiologic role is unclear. Two ISH family-specific truncating mutations, E220X and the 1-bp insertion P357insC that results in translation of an out-of-frame stop codon, were generated by site-directed mutagenesis and were shown to delete the CMG-2 transmembrane and/or cytosolic domains, respectively. An ISH compound mutation, I189T, is predicted to create a novel and destabilizing internal cavity within the protein. The JHF family-specific homoallelic missense mutation G105D destabilizes a von Willebrand factor A extracellular domain alpha-helix, whereas the other mutation, L329R, occurs within the transmembrane domain of the protein. Finally, and possibly providing insight into the pathophysiology of these diseases, analysis of fibroblasts derived from patients with JHF or ISH suggests that CMG2 mutations abrogate normal cell interactions with the extracellular matrix.
2003

Rights

Article information provided for research and reference use only. PedPalASCNET does not hold any rights over the resource listed here. All rights are retained by the journal listed under publisher and/or the creator(s).

Type

Journal Article

Citation List Month

Backlog

Pages

957-966

Issue

4

Volume

73

Citation

Dowling O; Difeo A; Ramirez MC; Tukel T; Narla G; Bonafe L; Kayserili H; Yuksel-Apak M; Paller AS; Norton K; Teebi AS; Grum-Tokars V; Martin GS; Davis GE; Glucksman MJ; Martignetti JA, “Mutations in capillary morphogenesis gene-2 result in the allelic disorders juvenile hyaline fibromatosis and infantile systemic hyalinosis,” Pediatric Palliative Care Library, accessed November 29, 2021, https://pedpalascnetlibrary.omeka.net/items/show/12874.

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