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Intrafamilial clinical variability in type C brachydactyly.

P Debeer¹, L De Smet, J P Fryns

¹Center for Human Genetics, University of Leuven, Belgium. philippe.debeer@med.kuleuven.ac.be

Genetic Counseling (Geneva, Switzerland)

|February 12, 2002

Summary

Clinical variability in brachydactyly type C is observed within a four-generation family. Skipped generations suggest it may not be a simple autosomal dominant trait, questioning single-gene mutations.

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Area of Science:

Genetics
Skeletal Dysplasias

Background:

Brachydactyly type C is a rare skeletal dysplasia characterized by shortening of digits.
Autosomal dominant inheritance is typically suspected for brachydactyly type C.

Observation:

A four-generation family with brachydactyly type C exhibited significant intrafamilial clinical and radiological variability.
Three affected members presented with diverse manifestations of the condition.

Findings:

The family displayed 'skipped generations,' where the trait appeared to bypass individuals.
This pattern challenges the presumed simple autosomal dominant inheritance model for brachydactyly type C.

Implications:

The findings suggest that brachydactyly type C may involve more complex genetic mechanisms than previously thought.

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Further research is needed to elucidate the genetic basis and understand the variability in brachydactyly type C.