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Related Experiment Videos

Segregation analysis in nonsyndromic holoprosencephaly

S Odent1, B Le Marec, A Munnich

  • 1Pédiatrie-Génétique Médicale, CHU de Rennes, France. odent@sunaimed.univ-rennes1.fr

American Journal of Medical Genetics
|May 30, 1998
PubMed
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Nonsyndromic holoprosencephaly (HPE) may follow an autosomal dominant inheritance pattern. This genetic model suggests a recurrence risk of 13-14% after an isolated case, with 82-88% penetrance.

Area of Science:

  • Developmental Neuroscience
  • Human Genetics
  • Pediatric Neurology

Background:

  • Holoprosencephaly (HPE) is a congenital brain malformation characterized by incomplete forebrain cleavage, often accompanied by facial anomalies.
  • This study focuses on nonsyndromic and nonchromosomal forms of HPE to investigate genetic transmission patterns.
  • Previous research indicates familial aggregation, suggesting a genetic basis for certain HPE cases.

Purpose of the Study:

  • To analyze the inheritance patterns of nonsyndromic holoprosencephaly (HPE).
  • To estimate the penetrance and recurrence risk for HPE within families.
  • To develop a genetic model for predicting HPE risk.

Main Methods:

  • Selection of 97 cases of nonsyndromic, nonchromosomal HPE from 258 HPE records across 79 families.

Related Experiment Videos

  • Segregation analysis was performed on 79 nuclear families to assess inheritance patterns.
  • Estimation of penetrance and proportion of sporadic cases based on the proposed genetic model.

    • Main Results:

    • Familial aggregation was observed in 29% of the studied families.
    • Segregation analysis supported an autosomal dominant mode of inheritance for nonsyndromic HPE.
    • Estimated penetrance was 82% for major HPE types and 88% for all types (including minor/atypical).
    • The proportion of sporadic cases was estimated at 68%.

    Conclusions:

    • Nonsyndromic holoprosencephaly (HPE) is consistent with autosomal dominant inheritance.
    • The proposed genetic model predicts a recurrence risk of 13% for major HPE types and 14% for all types after an isolated case.
    • Understanding the genetic basis and recurrence risk is crucial for genetic counseling in families affected by HPE.