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Epidemiological analysis of rare polydactylies

E E Castilla1, R Lugarinho da Fonseca, M da Graca Dutra

  • 1Departamento de Genética, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil.

American Journal of Medical Genetics
|November 11, 1996
PubMed
Summary

This study analyzed over 6,900 polydactyly cases from millions of births, finding similar rare polydactyly frequencies across populations. Rare polydactyly is often linked to other congenital anomalies and syndromes.

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Area of Science:

  • Medical Genetics
  • Birth Defects Research
  • Epidemiology

Background:

  • Polydactyly, the presence of extra digits, is a common congenital anomaly.
  • Understanding its prevalence and types is crucial for genetic counseling and public health.
  • Large-scale studies are needed to establish population-specific and generalizable data.

Purpose of the Study:

  • To determine the prevalence and types of polydactyly in large, comparable birth cohorts.
  • To investigate potential ethnic and geographic variations in polydactyly frequencies.
  • To assess the association of polydactyly with other congenital anomalies and syndromes.

Main Methods:

  • Analysis of over 4 million births from the Latin-American Collaborative Study of Congenital Malformations (ECLAMC) and the Spanish Collaborative Study of Congenital Malformations (ECEMC).

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  • Classification of 6,912 polydactyly cases into 11 established types.
  • Comparison of birth prevalence rates between the two study groups, considering ethnic background.

    • Main Results:

    • Postaxial hexadactyly was significantly more frequent in the Latin American cohort (ECLAMC) than in the Spanish cohort (ECEMC).
    • Frequencies of rare polydactyly types were similar between the two populations, suggesting generalizability.
    • Approximately one-third of rare polydactyly cases were associated with other congenital anomalies, including multiple congenital anomaly (MCA) cases and recognized syndromes.

    Conclusions:

    • The study provides valuable epidemiological data on polydactyly prevalence and types.
    • Observed differences in postaxial hexadactyly prevalence are likely attributable to ethnic variations.
    • The high rate of syndromic polydactyly underscores the importance of comprehensive evaluation for associated anomalies.