Carrier Status and Genetic Counseling Individuals who possess one copy of a recessive gene mutation but do not have the disease are known as carriers. Parents who each carry one copy of the recessive gene are typically healthy themselves and often unaware they are carriers.
How Collagen Quality Influences Bone Strength and Genetic Inheritance
In this scenario, a person inherits a single copy of the altered gene from just one parent to develop the disorder. 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.
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. Males and females are equally likely to inherit the dominant gene and be affected.
How Collagen Quality and Genetic Variations Influence Bone Strength
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. Because the defective gene dominates the healthy one, the physical traits of the disease will likely be expressed.
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