Related Experiment Video
Updated: Oct 1, 2025

Navigating MARRVEL, a Web-Based Tool that Integrates Human Genomics and Model Organism Genetics Information
Published on: August 15, 2019
A novel pathogenic variant at the C-terminal propeptide cleavage site of COL1A1, causing osteogenesis imperfecta with
Steven H Lang1, Ryan A Gallo1, Irman Forghani1
1Department of Human Genetics, University of Miami Miller School of Medicine, Miami, Florida, USA.
Abstract:
Osteogenesis imperfecta (OI) is a rare connective tissue disorder with clinical and genetic heterogeneity. The cardinal features of OI are bone fragility and low bone mineral density (BMD). Pathogenic variants in COL1A1 and COL1A2 genes, which encode the proα-1(I) and proα-2(I) chains of Type 1 collagen, are the most common causes of OI. Mutations disrupting the carboxy-terminal propeptide cleavage site of the proα-1(I) and proα-2(I) chains have recently been reported as rare causes of OI with paradoxically normal to high BMD. This report describes a father and daughter with OI who are heterozygous for a novel likely pathogenic variant at the carboxy-terminal propeptide cleavage site of COL1A1 (NM_000088.4): c.3656A>G; (p.Asp1219Gly). We describe their intrafamilial phenotypic variability and overlapping features with other COL1A1-related disorders.
Related Concept Videos
Cystic Fibrosis: Pathogenesis
CF is primarily caused by a genetic mutation in a chromosome 7 gene coding for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. The most common gene mutation leading to CF is the ΔF508 mutation,...
Fibril-associated Collagen
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...
Point and Frameshift Mutations
Bone Disorders
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
Bone Formation by Endochondral Ossification
Pleiotropy

