EhlerDanlos syndrome is due to defect in?
**Core Concept**
Ehlers-Danlos syndrome (EDS) is a group of genetic disorders affecting collagen production, leading to skin hyperextensibility, joint hypermobility, and tissue fragility. The condition is characterized by defects in the structure and function of collagen, a vital protein responsible for providing strength and elasticity to connective tissue.
**Why the Correct Answer is Right**
The correct answer is related to the underlying pathophysiology of EDS, which involves a mutation in the genes that encode for collagen. Specifically, the COL5A1 and COL5A2 genes, responsible for encoding the alpha chains of type V collagen, have been implicated in the pathogenesis of classical EDS. The mutations lead to the production of abnormal type V collagen, which disrupts the normal structure and function of collagen fibrils, resulting in the characteristic clinical features of EDS.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as EDS is not primarily caused by a defect in elastin, a protein responsible for skin elasticity.
* **Option B:** This option is incorrect as EDS is not primarily caused by a defect in fibrillin, a protein associated with Marfan syndrome.
* **Option C:** This option is incorrect as EDS is not primarily caused by a defect in laminin, a protein involved in the formation of basement membranes.
**Clinical Pearl / High-Yield Fact**
It's essential to recognize that EDS is a heterogeneous group of disorders, and the specific genetic defect can vary depending on the subtype of the condition. A thorough understanding of the genetic basis of EDS is crucial for accurate diagnosis and management.
**Correct Answer: C. Defect in collagen**