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Interstitial deletions 4q21.1q25 and 4q25q27: phenotypic variability and relation to Rieger anomaly

A S Kulharya1, M Maberry, M K Kukolich

  • 1Department of Pathology, University of Texas Southwestern Medical Center, Dallas, USA.

American Journal of Medical Genetics
|January 16, 1995
PubMed
Summary

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Two patients with 4q deletion syndrome showed craniofacial and skeletal anomalies. Clinical variability in 4q deletions may stem from gene expression, deletion size, or imprinting.

Area of Science:

  • Genetics
  • Clinical Medicine
  • Human Genetics

Background:

  • Interstitial deletions of chromosome 4q (del(4q)) are rare genetic disorders.
  • These deletions can lead to a range of developmental abnormalities.

Observation:

  • Two patients with distinct interstitial 4q deletions were analyzed.
  • Patient 1 had del(4)(q21.1q25) with craniofacial and skeletal anomalies, succumbing to hydrocephalus.
  • Patient 2 had del(4)(q25q27) with similar anomalies, plus congenital hypotonia and developmental delay.

Findings:

  • Both patients presented with craniofacial and skeletal anomalies characteristic of 4q deletion syndrome.
  • Neither patient exhibited the Rieger anomaly, a feature sometimes associated with 4q deletions.
  • Observed clinical variability suggests complex genetic mechanisms influencing phenotype.

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Implications:

  • The study highlights the phenotypic variability within 4q deletion syndrome.
  • Genetic factors such as variable gene expression, deletion size, and imprinting effects are proposed to explain these differences.
  • Further research into the 4q region's genetic architecture is warranted for better understanding and potential therapeutic strategies.