The heterozygous <script type="math/tex">Lemd3^{+/GT}</script> mouse is not a murine model for osteopoikilosis in humans

Dheedene, Annelies; Deleye, Steven; Hellemans, Jan; Staelens, Steven; Vandenberghe, Stefaan; Mortier, Geert

doi:10.1007/S00223-009-9305-Z

Title

The heterozygous $Lemd3^{+/GT}$ mouse is not a murine model for osteopoikilosis in humans

Author

Dheedene, Annelies

Deleye, Steven

Hellemans, Jan

Staelens, Steven

Vandenberghe, Stefaan

Mortier, Geert

Abstract

Osteopoikilosis and the Buschke-Ollendorff syndrome are skeletal dysplasias with hyperostotic lesions in the long bones. These disorders are caused by heterozygous loss-of-function mutations in the LEMD3 gene. LEMD3 codes for a protein of the inner nuclear membrane that, through interaction with R-SMADs, antagonizes the BMP and TGFβ1 pathway. It is suggested that the hyperostotic lesions in these disorders are caused by enhanced BMP and TGFβ1 signaling. The exact mechanism by which mutations in the LEMD3 gene lead to these bone lesions has not yet been unraveled precisely. To further assess this, an Lemd3 genetrapped mouse was created in a gene-trapping program by Baygenomics. To investigate whether the heterozygous gene-trapped mouse is a good model for osteopoikilosis in humans, we studied these mice radiologically with high-resolution micro-computed tomography (microCT) and histologically. X-ray images were evaluated by a trained radiologist, but no typical osteopoikilosis lesions could be recognized. On all microCT reconstructed images a 3D cortical and trabecular quantitative analysis was performed, investigating different histomorphometric parameters ranging from percent bone volume, bone surface/volume ratio over trabecular thickness, separation, number, and pattern factor to structure model index and fractal dimension. No significant differences were found after a t-test statistical analysis. Also, histological analysis did not reveal lesions typical for osteopoikilosis. We conclude that the heterozygous Lemd3 genetrapped mouse is not a good model to study osteopoikilosis and the Buschke-Ollendorff syndrome.

Language

English

Source (journal)

Calcified tissue international. - New York, N.Y., 1979, currens

Publication

New York, N.Y. : 2009

ISSN

0171-967X [print]

1432-0827 [online]

DOI

10.1007/S00223-009-9305-Z

Volume/pages