Eustachian Tube Growth and Development: Anatomy/Function. Protocol Description. This study measures Eustachian tube function and facial growth over time in three groups of children: one with recurrent ear infections, one with chronic middle ear fluid, and one with little past history of otitis media.
Causes of Kartagener syndrome. Kartagener syndrome is caused by a mutation in the DNAI1 gene, which makes a cellular protein required for normal functioning cilia (cilia line the respiratory tract) and sperm motility.
Causes. Researchers have discovered a single gene mutation responsible for progeria. The gene, known as lamin A (LMNA), makes a protein necessary for holding the center (nucleus) of a cell together.When this gene has a defect, researchers believe the genetic mutation makes cells unstable, which appears to lead to progeria's aging process.esearchers have discovered a single gene mutation responsible for progeria. The gene, known as lamin A (LMNA), makes a protein necessary for holding the center (nucleus) of a cell together.