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Paternal transmission of congenital myotonic dystrophy

C E de Die-Smulders1, H J Smeets, W Loots

  • 1Department of Clinical Genetics, Maastricht University, The Netherlands.

Journal of Medical Genetics
|December 10, 1997
PubMed

Insights

Paternal transmission of congenital myotonic dystrophy (DM) is exceptionally rare. This case highlights that when it occurs, the father typically has adult-onset DM, often with milder symptoms.

Area of Science:

  • Genetics
  • Neurology
  • Pediatrics

Background:

  • Congenital myotonic dystrophy (DM) is a severe form of muscular dystrophy.
  • Paternal transmission of congenital DM is infrequently documented.
  • Understanding transmission patterns is crucial for genetic counseling.

Observation:

  • A 23-year-old male with severe congenital DM, respiratory and feeding issues at birth, presented with profound muscular weakness.
  • His siblings also had childhood-onset DM.
  • The father had adult-onset DM (onset ~30 years) and was the source of transmission.

Findings:

  • This report details a rare instance of paternally transmitted congenital DM.
  • Only six prior cases of paternal congenital DM transmission have been reported.
  • Male transmission of DM is associated with repeat contraction and reduced fertility in fathers.

Implications:

  • Paternal transmission of congenital DM is rare due to factors like reduced male fertility and repeat contraction.
  • Fathers transmitting congenital DM often exhibit later onset and potentially milder symptoms than affected mothers.
  • This finding has implications for genetic counseling and understanding DM inheritance patterns.

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