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Chromosome 15 structural abnormalities: effect on IGF1R gene expression and function.

Rossella Cannarella1, Teresa Mattina2, Rosita A Condorelli1

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|September 14, 2017
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Summary
This summary is machine-generated.

Altered Insulin-like Growth Factor 1 Receptor (IGF1R) gene expression, either increased or decreased, is linked to neurological and gonadal disorders in patients with chromosome 15 abnormalities. This study examines IGF1R in three such patients.

Keywords:
IGF1IGF1Rcryptorchidism

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Area of Science:

  • Genetics
  • Endocrinology
  • Developmental Biology

Background:

  • The Insulin-like Growth Factor 1 Receptor (IGF1R) gene, located at 15q26.3, is crucial for growth.
  • Structural abnormalities of chromosome 15 can impact IGF1R function and lead to various developmental issues.

Purpose of the Study:

  • To investigate IGF1R gene expression and function in three patients with distinct chromosome 15 structural abnormalities.
  • To correlate observed phenotypes with IGF1R alterations.

Main Methods:

  • Case study analysis of three unrelated patients with chromosome 15 abnormalities (duplication and ring chromosome).
  • Assessment of IGF1R mRNA and protein expression levels.
  • Evaluation of IGF1R activity.

Main Results:

  • Patient 1 (duplication) showed increased IGF1R mRNA (1.8-fold) and protein (1.3-fold) expression, associated with overgrowth and developmental issues.
  • Patient 2 (duplication) had normal IGF1R expression but exhibited overgrowth and developmental delay.
  • Patient 3 (ring chromosome) displayed decreased IGF1R mRNA (<0.5-fold) and undetectable activity, with intrauterine growth retardation and developmental delay.

Conclusions:

  • Both increased and decreased IGF1R gene expression may contribute to neurological and gonadal disorders in chromosome 15 abnormalities.
  • Phenotypic features in 15q duplication and deletion syndromes share similarities, suggesting a common pathway involving IGF1R.