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Genetic Hearing Loss- Syndromes Global Journal of Otolaryngology ISSN 2474-7556 Review Article Glob J Otolaryngol Special Issue - March 2017 Copyright © All rights are reserved by Lalsa Shilpa Perepa DOI: 10.19080/GJO.2017.05.555665 Genetic Hearing Loss- Syndromes (Figure 1) Autosomal dominant Table 1: X- Linked NSHI. Locus Gene Type and Onset Frequencies Name Symbol Degree Progressive DFNX1 Post- sensorineural; PRPS1 All (DFN2) lingual severe to profound Progressive, mixed; DFNX2 POU3F4 Pre-lingual variable, but All (DFN3) progresses to profound Progressive DFNX4 sensorineural; SMPX Postlingual All (DFN6) mild to Figure 1: Non Syndromic Hearing loss. profound Locus name- DFNA Table 2: Mitochondrial NSHI. Gene a) Some cause pre-lingual deafness, progressive and Mutation Severity Penetrance Symbol affects all frequencies and sometimes downward sloping type Highly variable, hearing loss 961 different MT-RNR1 Variable aminoglycoside mutations b) Mostly post-lingual deafness affecting all frequencies induced and begins in any decade of life. 1494C>T Autosomal recessive 1555A>G MT-TS1 7445A>G Highly variable Locus name- DFNB 7472insC a) Some cause post-lingual deafness, can be stable or 7510T>C progressive and causes moderate to profound hearing loss. 7511T b) Most of them cause pre lingual, can be stable or Complete, progressive and causes moderate to profound hearing loss aminoglycoside (Tables 1 & 2) (Figure 2). Severe to associated; MT-CO1 7444G>A profound associated with MT-RNR1 1555A>G Apert Syndrome i. AKA= Acrocephalosyndactyly Single gene autosomal dominant caused by the mutation of FGFR2 gene, located on the long arm of chromosome 10 at 10q26 Audiological findings a) CHL-mild to moderate b) chronic middle ear disease Figure 2: Syndromic Hearing loss. c) ossicular anomalies Glob J Otolaryngol 5(3): GJO.MS.ID.555665 (2017) 00108 Global Journal of Otolaryngology Symptoms b) Marked hypoplasia of the nasal bone, i. CNS growth affected c) Short philtrum ii. craniofacial & limb abnormalities d) Short and retro positioned maxilla. iii. mitten hand e) Convergent strabismus (blepharophimosis) iv. low set ears posteriorly rotated f) Reduced visibility of the medial sclera v. synostosis of one or more ossicles g) The head circumference, clivus length, and facial depth are smaller in affected individuals with this syndrome. vi. Fixation of footplate of stapes Waardenburg syndrome is a heterogeneous vii. Reduced ME space II. Type II: group with normally located canthi (without dystopia viii. ET dysfunction canthorum). a) Sensorineural hearing loss (77%) ix. x. SyndactylyBrachymelia of fingers and toes b) Heterochromia iridium (47%) is the 2 most important diagnostic indicators for this type. xi. MR III. Type III- Waardenburg syndrome (Klein- xii. Hydrocephaly Waardenburg syndrome) is similar to type I but is also characterized by musculoskeletal abnormalities xiii. Cognitive imparment Waardenburg Syndrome a) b) Lack Aplasia of differentiationof the first 2 ribs of the small carpal bones a) It is the most common form of inheritable congenital deafness. c) cystic formation of the sacrum b) Genetic Analysis Distal end of band 2q35gene d) Abnormalities of the arms responsible is: PAX3 e) Amyoplasia and stiffness of the joints f) Bilateral cutaneous syndactyly expression in this syndrome. c) There is a significant amount of variability of g) mental retardation There may be unilateral or bilateral sensorineural hearing loss in patients and the phenotypic expressions may include h) Microcephaly pigmentary anomalies and craniofacial features. i) severe skeletal anomalies. Symptoms IV. Type IV: Waardenburg syndrome (Shah-Waardenburg a) Marked facial asymmetry syndrome) is the association of Waardenburg syndrome with congenital aganglionic megacolon (Hirschsprung disease). b) Lagophthalmos A. Dystopia canthorum is found in 41.2-99% of persons c) A drooping right corner of the mouth. with Waardenburg syndrome. d) Absence of naso-frontal angle a) The distance between the inner angles of the eyelids e) Eyebrow hypertrichosis is accompanied by increased distance between the inferior lacrimal points. f) Upturned nasal tip b) Hageman and Delleman divided Waardenburg g) Shortened upper lip syndrome into 2 variants: with dystopia canthorum and h) Pronounced cupid’s bow. without. I. Type I: Waardenburg syndrome is characterized by I. Congenital deafmutism occurs in 9-62.5% of persons evidence of dystopia canthorum and the full symptomatology with Waardenburg syndrome. of the disease. II. Different combinations of hearing loss occur: a) Narrow nose unilateral or bilateral, severe or moderate, total or moderate. 00109 How to cite this article: Genetic Hearing Loss- Syndromes. Glob J Oto 2017; 5(3): 555665.. DOI: 10.19080/GJO.2017.05.555665. Global Journal of Otolaryngology Fisch separated Waardenburg syndrome into the following distinct types according to audiogram results. b. Seventy-five percent of patients with branchio-oto- a) Patients with total deafness and little residual Treacherrenal syndrome Collins have Syndrome significant hearing loss. hearing at the lower frequency a. Conductive hearing loss is present 30% of the time, b) Patients with a moderate degree of deafness with but sensorineural hearing loss and vestibular dysfunction can uniform hearing loss in the lower and middle frequency with also be present. improvement in the higher frequency b. Ossicular malformations are common in these i. Pigmentary disturbances of hairs in Waardenburg patients. syndrome include 2 types of alterations: white forelock and c. The syndrome is transmitted autosomal dominant premature graying of scalp hair, eyebrows, cilia, or body hair. with high penetrance gene located on 5q-32-q33.1, TREACLE ii. The white forelock is observed in 17-58.4% of persons Neurofibromatosis with Waardenburg syndrome and involves the forehead (and both medial eyebrows), the vertex, or another part of scalp. 1) Mental retardation, blindness, and sensorineural hearing loss can result from central nervous system tumors. iii. The white forelock may be evident at birth or soon afterward, or it may develop later. iv. Poliosis may persist throughout life or may disappear 2) 3) Autosomal Neurofibromatosis dominant is 22q12.2.classified as types 1 and 2. 4) NF2 is a tumor supressor gene in thev. firstPatients years of withlife and Waardenburg reappear later. syndrome become 5) Acoustic neuromas are usually unilateral and occur in prematurely gray in 7% of cases. only 5% of affected patients. Stickler Syndrome a) Cleft palate and severe myopia are its characteristics distinct disorder, is characterized by bilateral acoustic 6) Neurofibromatosis type 2, which is a genetically features. neuromas. 7) Bilateral acoustic neuromas are present in 95% of hearing loss is present in about 15% of cases, whereas hearing affected patients and are usually asymptomatic until early b) Significant sensorineural hearing loss or mixed loss of lesser severity may be present in up to 80% of cases. adulthood. c) Autosomal dominant- COLI1A1, COLI1A2,COL2A1, Ushers Syndrome COL2A2 and several others a. Usher’s syndrome has a prevalence of 3.5 per 100,000 Norrie Syndrome populations. Norrie syndrome is a sex-linked disorder that includes b. Sensorineural hearing loss and retinitis pigmentosa congenital or rapidly progressive blindness characterize the syndrome. Alport Syndrome I. Usher type 1 patients have congenital bilateral profound hearing loss and absent vestibular function a. Alport syndrome involves hearing loss associated with renal impairment of varying severity. II. Type 2 patients have moderate losses and normal vestibular function. b. When a genetic mutation occurs, connecting structures in both the inner ear and kidney become increasingly III. Type 3 demonstrate progressive hearing loss and fragile, resulting in progressive hearing impairment and variable vestibular dysfunction and are found primarily in the kidney disease Norwegian population. c. Eustation tube dysfunction occurs secondarily to the Pendred Syndrome cleft palate and results in conductive hearing loss. a. Pendred’s syndrome includes thyroid goiter and d. Ossicular abnormalities may also be present. profound sensorineural hearing loss. Branchio-oto-renal Syndrome b. Hearing loss is progressive in about 15% of patients. a. Branchio-oto-renal syndrome is estimated to occur in The majority of patient present with bilateral moderate to 2% of children with congenital hearing impairment. severe sensorineural hearing impairment, with some residual hearing in the low frequencies. 00110 How to cite this article: Genetic Hearing Loss- Syndromes. Glob J Oto 2017; 5(3): 555665. DOI: 10.19080/GJO.2017.05.5556665. Global Journal of Otolaryngology Otopalatodigital Syndrome Charge a) Otopalatodigital syndrome includes hypertelorism, a. Coloboma, Heart anomalies, Atresia, Choanae, Retarded growth and development, Genital hypoplasia and ear midface, small nose, and cleft palate. anomalies craniofacial deformity involving supraorbital area, flat b. Autosomal dominant inheritance and toes that vary in length, with an excessively wide space b) Patients are short statured with broad fingers and vestibular anomalies c. CHL, SNHL or mixed, trough shaped configuration c) Conductive hearing loss is seen due to ossicular between the first and second toe. Symptoms malformations. Affected males manifest the full spectrum of the disorder and females may show mild involvement. a. CNS impairment d) The gene has been found to be located on chromosome b. Brain malformation Xq28. c. Facial paresis
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