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.
Klinefelter syndrome is typically caused by what is called nondisjunction, more specifically nondisjunction of the sex chromosomes. The X and Y chromosome are known as sex chromosomes, and their presence or absence determines the gender of the embryo.