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Intrafamilial variability in Fraser syndrome.

Pankaj Prasun1, Mandakini Pradhan, Himanshu Goel

  • 1Sanjay Gandhi Postgraduate Institute of Medical Sciences, Medical Genetics, India. drpankajprasoon@yahoo.co.in

Prenatal Diagnosis
|June 5, 2007
PubMed
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Fraser syndrome, a rare genetic disorder, presents significant clinical variability even within families. This case study highlights extreme heterogeneity, with one sibling experiencing a lethal outcome and another a mild presentation.

Area of Science:

  • Genetics
  • Developmental Biology
  • Rare Diseases

Background:

  • Fraser syndrome is a rare autosomal recessive disorder.
  • It is characterized by a range of congenital anomalies including cryptophthalmos and syndactyly.
  • Previous observations noted interfamilial clinical heterogeneity but intrafamilial similarity.

Observation:

  • This study reports on a family with two affected individuals diagnosed with Fraser syndrome.
  • Significant clinical heterogeneity was observed within this single family.
  • One individual presented with a lethal phenotype including bilateral renal agenesis, while the other had a mild phenotype with normal kidney function.

Findings:

  • The findings demonstrate extreme intrafamilial clinical heterogeneity in Fraser syndrome, challenging previous assumptions.

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  • This case represents a previously unreported degree of phenotypic variability within a single family.
  • The observed differences in severity, particularly renal involvement, were striking.

    • Implications:

    • These findings underscore the critical importance of comprehensive genetic counseling and prenatal screening for families with a history of Fraser syndrome.
    • Careful monitoring and screening of pregnancies in at-risk families are essential due to unpredictable phenotypic expression.
    • Further research into the genetic and environmental factors influencing Fraser syndrome's variable expressivity is warranted.