Mutations in the gene encoding capillary morphogenesis protein 2 cause juvenile hyaline fibromatosis and infantile systemic hyalinosis
Female; Humans; Male; Family; Mutation; Animals; Molecular Sequence Data; Non-U.S. Gov't; Research Support; Pedigree; Membrane Proteins/genetics; Base Sequence; Amino Acid Sequence; Amino Acid; DNA Primers; Fibroma/genetics; Genetic Markers; Gingival Hypertrophy/genetics; In Situ Hybridization; Myofibromatosis/genetics; Reverse Transcriptase Polymerase Chain Reaction; Sequence Alignment; Sequence Homology; Skin Neoplasms/genetics
Juvenile hyaline fibromatosis (JHF) and infantile systemic hyalinosis (ISH) are autosomal recessive conditions characterized by multiple subcutaneous skin nodules, gingival hypertrophy, joint contractures, and hyaline deposition. We previously mapped the gene for JHF to chromosome 4q21. We now report the identification of 15 different mutations in the gene encoding capillary morphogenesis protein 2 (CMG2) in 17 families with JHF or ISH. CMG2 is a transmembrane protein that is induced during capillary morphogenesis and that binds laminin and collagen IV via a von Willebrand factor type A (vWA) domain. Of interest, CMG2 also functions as a cellular receptor for anthrax toxin. Preliminary genotype-phenotype analyses suggest that abrogation of binding by the vWA domain results in severe disease typical of ISH, whereas in-frame mutations affecting a novel, highly conserved cytoplasmic domain result in a milder phenotype. These data (1) demonstrate that JHF and ISH are allelic conditions and (2) implicate perturbation of basement-membrane matrix assembly as the cause of the characteristic perivascular hyaline deposition seen in these conditions.
2003
Hanks S; Adams S; Douglas J; Arbour L; Atherton DJ; Balci S; Bode H; Campbell ME; Feingold M; Keser G; Kleijer W; Mancini G; McGrath JA; Muntoni F; Nanda A; Teare MD; Warman M; Pope FM; Superti-Furga A; Futreal PA; Rahman N
American Journal Of Human Genetics
2003
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).
Journal Article
<a href="http://doi.org/10.1086/378418" target="_blank" rel="noreferrer">10.1086/378418</a>
Mutations in capillary morphogenesis gene-2 result in the allelic disorders juvenile hyaline fibromatosis and infantile systemic hyalinosis
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
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
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
American Journal Of Human Genetics
2003
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).
Journal Article
<a href="http://doi.org/10.1086/378781" target="_blank" rel="noreferrer">10.1086/378781</a>