Caffey disease is associated with distinct arginine to cysteine substitutions in the proα1(I) chain of type I procollagen

Tibbe Dhooge, Delfien Syx, Trinh Hermanns-Lê, Ingrid Hausser, Geert Mortier, Jonathan Zonana, Sofie Symoens, Peter H. Byers, Fransiska Malfait

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Purpose: Infantile Caffey disease is a rare disorder characterized by acute inflammation with subperiosteal new bone formation, associated with fever, pain, and swelling of the overlying soft tissue. Symptoms arise within the first weeks after birth and spontaneously resolve before the age of two years. Many, but not all, affected individuals carry the heterozygous pathogenic COL1A1 variant (c.3040C>T, p.(Arg1014Cys)). Methods: We sequenced COL1A1 in 28 families with a suspicion of Caffey disease and performed ultrastructural, immunocytochemical, and biochemical collagen studies on patient skin biopsies. Results: We identified the p.(Arg1014Cys) variant in 23 families and discovered a novel heterozygous pathogenic COL1A1 variant (c.2752C>T, p.(Arg918Cys)) in five. Both arginine to cysteine substitutions are located in the triple helical domain of the proα1(I) procollagen chain. Dermal fibroblasts (one patient with p.(Arg1014Cys) and one with p.(Arg918Cys)) produced molecules with disulfide-linked proα1(I) chains, which were secreted only with p.(Arg1014Cys). No intracellular accumulation of type I procollagen was detected. The dermis revealed mild ultrastructural abnormalities in collagen fibril diameter and packing. Conclusion: The discovery of this novel pathogenic variant expands the limited spectrum of arginine to cysteine substitutions in type I procollagen. Furthermore, it confirms allelic heterogeneity in Caffey disease and impacts its molecular confirmation.

Original languageEnglish (US)
Pages (from-to)2378-2385
Number of pages8
JournalGenetics in Medicine
Volume23
Issue number12
DOIs
StatePublished - Dec 2021

ASJC Scopus subject areas

  • Genetics(clinical)

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