We have an active research group focused on the function and dysfunction of the inner ear. Our goal is to understand how stimuli from the external world, such as sound, gravity and head movements are converted into electrical signals, how the information is encoded and how it is transmitted to the brain. Furthermore, we want to understand why genetic mutations cause hearing and balance dysfunction. We plan to use this information to design novel therapeutic innervations for deafness and balance disorders.
Sensory transduction in the ear beings with deflection of mechanosensitive organelles that project from the apical surface of inner ear hair cells. The exquisite sensitivity of the auditory system can initiate signals that encode the faint pizzicato of a classical violin. Remarkably, auditory hair cells can also detect stimuli with amplitudes over a million times greater, and thus can signal the booming cannons of Tchaikovsky's 1812 Overture as well. This extraordinary dynamic range is the result of a sensory transduction process that utilizes several feedback mechanisms to precisely reposition and tune the mechanosensitive apparatus within the optimal range allowing detection of auditory stimuli that span the breadth of amplitudes and frequencies humans encounter daily.
Ongoing projects in the lab include the study of:
Mechanotransduction and adaptation in sensory hair cells.
Firing properties of afferent neurons that relay information to the brain.
Development of inner ear function.
Novel gene therapy strategies to treat inner ear dysfunction.
About Jeffrey Holt
Jeffrey Holt received a PhD from the University of Rochester in 1995. He completed a postdoctoral fellowship with the Howard Hughes Medical Institute at Harvard Medical School in the laboratory of David Corey. In 2001 Dr. Holt accepted a faculty position in the Department of Neuroscience at the University of Virginia. In 2011 he returned to Harvard to join the Department of Otolaryngology, the F.M. Kirby Neurobiology Center and the Neurobiology Program at Boston Children’s Hospital. Dr. Holt was promoted to Professor of Otolaryngology at Harvard Medical School in 2016.
- Liu XP, Koehler KR, Mikosz AM, Hashino E, Holt JR. Functional development of
mechanosensitive hair cells in stem cell-derived organoids parallels native
vestibular hair cells. Nature Com.. 7:11508, 2016
- Akyuz N, Holt JR. Plug-N-Play: Mechanotransduction Goes Modular. Neuron.
- Askew C, Rochat C, Pan B, Asai Y, Ahmed H, Child E, Schneider BL, Aebischer P,
Holt JR. Tmc gene therapy restores auditory function in deaf mice. Science Translational
Medicine. 7(295):295ra108, 2015.
- Pan B, Holt JR. The molecules that mediate sensory transduction in the
mammalian inner ear. Curr Opin Neurobiol. 34:165-71, 2015
- Géléoc GS, Holt JR. Sound strategies for hearing restoration. Science. 344(6184):1241062. 2014.
- Horwitz GC, Risner-Janiczek JR, Holt JR. Mechanotransduction and
hyperpolarization-activated currents contribute to spontaneous activity in mouse
vestibular ganglion neurons. J Gen Physiol. 143(4):481-97, 2014.
- Kim YH, Holt JR. Functional contributions of HCN channels in the primary
auditory neurons of the mouse inner ear. J Gen Physiol. 142(3):207-23, 2013
- Pan B, Géléoc GS, Asai Y, Horwitz GC, Kurima K, Ishikawa K, Kawashima Y,
Griffith AJ, Holt JR. TMC1 and TMC2 are components of the mechanotransduction
channel in hair cells of the mammalian inner ear. Neuron. 79(3):504-15, 2013
- Levin ME, Holt JR. The function and molecular identity of inward rectifier
channels in vestibular hair cells of the mouse inner ear. J Neurophysiol.
- Kawashima Y, Géléoc GS, Kurima K, Labay V, Lelli A, Asai Y, Makishima T, Wu
DK, Della Santina CC, Holt JR, Griffith AJ. Mechanotransduction in mouse inner
ear hair cells requires transmembrane channel-like genes. J Clinical Investigation.
For a complete list of Dr. Holt's publications, click here.