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Lethal Alleles02:41

Lethal Alleles

Agouti: A Lethal Allele
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...

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The Pathogenic ADAMTSL2 D167N Variant Causes Geleophysic Dysplasia-Like Connective Tissue Changes in Mice.

Connie Lin1, Divya I Sivakumar1, Ana D Alcocer1

  • 1Department of Pediatrics, Case Western Reserve University School of Medicine, Cleveland, Ohio.

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Summary

Geleophysic dysplasia (GD) is a severe skeletal disorder. A new mouse model carrying the ADAMTSL2 D167N mutation accurately mimics GD1 patient symptoms, aiding future treatment development.

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Area of Science:

  • Genetics and Developmental Biology
  • Skeletal Dysplasias
  • Rare Diseases

Background:

  • Geleophysic dysplasia (GD) is a rare genetic disorder characterized by severe short stature, skeletal abnormalities, and potentially fatal complications.
  • Current treatments for GD are limited, highlighting the need for effective disease models to test therapeutic strategies.

Purpose of the Study:

  • To develop a mouse model for severe Geleophysic dysplasia type 1 (GD1) by introducing a specific ADAMTSL2 mutation.
  • To validate the model's ability to recapitulate key clinical and pathological features of GD1.

Main Methods:

  • Generated a mouse model by introducing the patient-specific ADAMTSL2 c.499G>A (p.D167N) mutation into the mouse Adamtsl2 locus.
  • Assessed postnatal survival, skeletal morphology via radiography, growth plate histology, cardiac valve structure, and lung pathology in homozygous mutant mice.

Main Results:

  • Homozygous Adamtsl2D167N/D167N mice exhibited reduced survival and short stature.
  • Radiographs and histology confirmed shortened limbs, ovoid vertebrae, abnormal growth plates, dysplastic aortic valves, and bronchial obstruction, mirroring GD1 patient phenotypes.

Conclusions:

  • The ADAMTSL2 D167N mouse model effectively recapitulates the major clinical and pathological features of severe GD1.
  • This model provides a valuable platform for investigating GD1 pathogenesis and evaluating novel therapeutic interventions.