Knowra Waardenburg syndrome Waardenburg syndrome Waardenburg syndrome is a group of inherited disorders characterized by congenital sensorineural hearing loss and altered pigmentation of the skin, hair, or eyes. Some forms also affect facial features or intestinal development.
Neural crest : A transient embryonic cell population that generates diverse tissues, including pigment cells and parts of the peripheral nervous system. Neural crest development links pigment-cell abnormalities with hearing and facial features in several forms.
PAX3 : A gene encoding a transcription factor involved in embryonic development, including the formation of neural crest-derived tissues. PAX3 variants cause Waardenburg syndrome types 1 and 3.
Waardenburg syndrome type 1 : A Waardenburg syndrome subtype typically associated with dystopia canthorum, a lateral displacement of the inner corners of the eyes. This subtype is distinguished by a characteristic change in the spacing of the inner eye corners.
Tietz syndrome : A rare inherited disorder marked by generalized hypopigmentation and congenital hearing loss, often caused by MITF variants. It overlaps with Waardenburg syndrome but typically causes more widespread loss of pigmentation.
Petrus Johannes Waardenburg : A Dutch ophthalmologist who described the syndrome now bearing his name in 1951. His clinical account identified the combination of hearing loss, pigmentary features, and facial traits.
Melanocyte : A pigment-producing cell that synthesizes melanin in the skin, hair, and eyes. Abnormal melanocyte development produces the characteristic pigment differences.
MITF : A gene encoding a transcription factor that regulates melanocyte development and function. MITF variants cause type 2 Waardenburg syndrome and can also affect vision.
Waardenburg syndrome type 2 : A Waardenburg syndrome subtype with pigmentary changes and hearing loss but without dystopia canthorum. Its absence of dystopia canthorum helps distinguish it from type 1.
Piebaldism : An inherited condition characterized by patches of skin and hair lacking pigment, usually caused by KIT variants. Both can produce a white forelock, but piebaldism does not typically cause congenital hearing loss.
Waardenburg syndrome type 1 diagnostic criteria : Clinical criteria used to assess features associated with Waardenburg syndrome type 1, including dystopia canthorum and pigmentary or hearing findings. These criteria formalize the clinical pattern first recognized in descriptions of the syndrome.
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