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 can be caused by: 1  One extra copy of the X chromosome in each cell (XXY), the most common cause. 2  An extra X chromosome in some of the cells (mosaic Klinefelter syndrome), with fewer symptoms. 3  More than one extra copy of the X chromosome, which is rare and results in a severe form.