Which one of the following is NOT a feature of Kartagener’s syndrome –
**Core Concept**
Kartagener's syndrome is a rare genetic disorder characterized by the combination of primary ciliary dyskinesia (PCD), situs inversus, and chronic sinusitis with bronchiectasis. The underlying issue is a defective dynein arm in the cilia, leading to impaired ciliary function and movement.
**Why the Correct Answer is Right**
Kartagener's syndrome is a complex condition that involves the respiratory, gastrointestinal, and reproductive systems. The key features include:
- Primary ciliary dyskinesia (PCD): This is due to the defective dynein arm, which is essential for ciliary movement. Cilia are involved in mucociliary clearance, and their dysfunction leads to chronic respiratory infections.
- Situs inversus: This is a condition where the major organs in the chest and abdomen are reversed or mirrored from their normal positions. The exact cause is still unclear, but it's thought to be related to the abnormal ciliary movement during embryonic development.
- Chronic sinusitis with bronchiectasis: The impaired ciliary function leads to recurrent respiratory infections, which can cause chronic sinusitis and bronchiectasis.
**Why Each Wrong Option is Incorrect**
**Option A:** This option should be filled with a feature of Kartagener's syndrome, but since it's not provided, we'll skip it.
**Option B:** This option should be filled with a feature of Kartagener's syndrome, but since it's not provided, we'll skip it.
**Option C:** This option should be filled with a feature of Kartagener's syndrome, but since it's not provided, we'll skip it.
**Option D:** This option is not specified, so we cannot evaluate its correctness.
**Clinical Pearl / High-Yield Fact**
Kartagener's syndrome is often associated with a defect in the DNAI1 gene, which encodes the dynein heavy chain 1 protein. This highlights the importance of genetic testing in diagnosing this condition.
**Correct Answer:**