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.
What is the cause of the chromosome aberration in Klinefelter's syndrome? Certain chromosome aberrations appear more frequently in children of elderly mothers and, to a certain extent, also elderly fathers, but this is not the case of Klinefelter's syndrome, and today nothing definite is known about causes leading to an increase in the number of X-chromosomes as found in Klinefelter's syndrome.