Age-related hearing loss in four Italian genetic isolates: an epidemiological study.
The objective of this study was to estimate the prevalence of hearing impairment in four genetically isolated Italian villages (Carlantino, Campora, Gioi-Cardile, and Stoccareddo), 1682 subjects were recruited from all the individuals participating in a multidisciplinary study. They underwent otoscopy and pure-tone audiometry and completed a questionnaire. The audiological data show that the percentage of impaired people increases with age and in particular becomes relevant aged over 40. For this reason we decided to compare the PTA values of individuals aged 40 or older. The PTA values of Stoccareddo and Carlantino are statistically different from PTAs of the other villages. Campora and Gioi-Cardile, both located within the Cilento National Park, have similar middle-low frequency PTA values while some differences are present at high frequencies. Using pedigrees it was possible to calculate the heritability of the trait. For Carlantino and Gioi-Cardile the percentage of the phenotype variation attributable to genetic variation is not significant, while for Campora the heritability value is 0.49 (p = 0.01) suggesting that genetic factors may have an important role.
Bedin
Elisa
E
Medical Genetics, IRCCS Burlo Garofolo, Trieste, Italy.
Franzè
Annamaria
A
Zadro
Cristina
C
Persico
Maria Graziella
MG
Ciullo
Marina
M
Hladnik
Uros
U
Dolcetta
Diego
D
Grasso
Domenico Leonardo
DL
Riccardi
Pasquale
P
Nutile
Teresa
T
Andrighetto
Gilberto
G
D'Adamo
Pio
P
Gasparini
Paolo
P
Marciano
Elio
E
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging; D002648:Child; D002675:Child, Preschool; D005260:Female; D020022:Genetic Predisposition to Disease; D005843:Geography; D034381:Hearing Loss / Q000453:epidemiology* / Q000235:genetics* / Q000473:pathology; D006801:Humans; D007223:Infant; D007558:Italy / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D010375:Pedigree; D015995:Prevalence; D019655:Quantitative Trait, Heritable; D055815:Young Adult