Males and females are equally likely to inherit the dominant gene and be affected. The expression of osteogenesis imperfecta is highly variable, influenced by the specific gene involved, the exact location of the mutation, and other unknown genetic and environmental factors.
Visual Guide to Osteogenesis Imperfecta Inheritance Patterns
One family member might experience frequent fractures and severe bone deformities, while another relative with the same genetic mutation might have only a tendency toward mild, blue-tinted sclerae (the whites of the eyes) with few or no fractures. The fragile bones and susceptibility to fractures are not the result of lifestyle or environmental factors during a person's life, but rather stem from a flaw in the blueprint of the body passed down from parents.
Understanding whether parents are carriers provides crucial information about the statistical probability of passing the condition on. The most common culprit is the COL1A1 gene, which provides instructions for making type 1 procollagen, while the COL1A2 gene is responsible for the production of a similar component.
Visual Guide to Osteogenesis Imperfecta Inheritance Patterns
Genetic counseling plays a vital role for families with a history of brittle bone disease or for couples where one partner knows they are a carrier. When these genes are altered, the body produces either insufficient collagen or collagen that is of poor quality, resulting in bones that are prone to breaking easily.
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