"Study shows normal hearing fails to develop when thyroid hormone availability is insufficient as a result of a genetic mutation.  www.Shutterstock.com ...A new study from Tel Aviv University shows that thyroid imbalance can lead to congenital deafness.  'Since our laboratory mainly focuses on the system of the inner ear, the study of a system such as the thyroid gland was new to us and therefore challenging,' said Dr. Amiel Dror of the Department of Human Molecular Genetics and Biochemistry at TAU’s Sackler School of Medicine. 'My curiosity as to how these two systems interact together to develop normal hearing led to this multidisciplinary study.'  Together with co-author Prof. Karen B. Avraham, Dror used state-of-the-art imaging on mouse populations to study a form of congenital deafness that affects humans. The researchers tracked the inner hair cells of the cochlea (the auditory portion of the inner ear) in 2 groups — control (wild) mice and mutant (congenitally deaf) mice."