Epidemiology and genetics of microtia-anotia: a registry based study on over one million births

Giuseppe Zampino, Pierpaolo Mastroiacovo, Domenico Fusco, Carlo Corchia, Roberta Lanni, Danilo Fusco

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Abstract

The epidemiology and genetics of microtia-anotia (M-A) were studied using data collected from the Italian Multicentre Birth Defects Registry (IPIMC) from 1983 to 1992. Among 1,173, 794 births, we identified 172 with M-A, a rate of 1.46/10,000; 38 infants (22.1%) had anotia. Of the 172 infants, 114 (66.2%) had an isolated defect, 48 (27.9%) were multiformed infants (MMI) with M-A, and 10 (5.8%) had a well defined syndrome. The frequency of bilateral defects among non-syndromic cases was 12% compared to 50% of syndromic cases (p = 0.007). Among the MMI only holoprosencephaly was preferentially associated with M-A (four cases observed upsilon 0.7 expected, p = 0.005). No significant variations were identified in the prevalence of non-syndromic cases by geographical area (range 0.62-2.37/10,000 births) or by five month time periods (range 0.21-2.58/10,000 births), nor was there evidence of time trends. When M-A cases were compared to controls, we found that mothers with parity 1 had a higher risk of giving birth to an MMI with M-A, and that mothers with chronic maternal insulin dependent diabetes were at significantly higher risk for having a child with M-A. MMI with M-A had higher rates of prematurity, low birth weight, reduced intrauterine growth, and neonatal mortality than infants with isolated M-A and controls. Babies with isolated M-A had, on average, a lower birth weight than controls; the difference was higher for females. The analysis of pedigrees and familial cases suggests an autosomal dominant trait with variable expression and incomplete penetrance in a proportion of cases, or a multifactorial aetiology. Three cases had consanguineous parents, but the absence of M-A among previous sibs does not support autosomal recessive inheritance.
Original languageEnglish
Pages (from-to)453-457
Number of pages5
JournalJOURNAL OF MEDICAL GENETICS
Volume32
Publication statusPublished - 1995

Keywords

  • Abnormalities, Multiple
  • Birth Weight
  • Consanguinity
  • Diabetes Mellitus, Type 1
  • Ear, External
  • Female
  • Humans
  • Infant, Newborn
  • Italy
  • Male
  • Parity
  • Pregnancy
  • Pregnancy in Diabetics
  • Prevalence
  • Registries
  • Syndrome

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