Communicated by: Shinichi Aizawa
Naso-maxillary deformity due to frontonasal expression of human transthyretin gene in transgenic mice
Article first published online: 27 SEP 2002
Genes to Cells
Volume 7, Issue 10, pages 1087–1098, October 2002
How to Cite
Noguchi, H., Kaname, T., Sekimoto, T., Senba, K., Nagata, Y., Araki, M., Abe, M., Nakagata, N., Ono, T., Yamamura, K.-i. and Araki, K. (2002), Naso-maxillary deformity due to frontonasal expression of human transthyretin gene in transgenic mice. Genes to Cells, 7: 1087–1098. doi: 10.1046/j.1365-2443.2002.00581.x
- Issue published online: 27 SEP 2002
- Article first published online: 27 SEP 2002
- Received: 7 March 2002 Accepted: 5 July 2002
Background Retinoic acid, a metabolic product of retinol, is essential for craniofacial morphogenesis. Transthyretin (TTR) is a plasma protein delivering retinol to tissues. We produced several transgenic mouse lines using the human mutant TTR (hTTRMet30) gene to establish a mouse model of familial amyloidotic polyneuropathy. One of the lines showed an autosomal dominant inheritance of naso-maxillary deformity termed Nax.
Results: The Nax malformation was characterized by a hypoplastic developmental defect of the frontonasal region. Homozygous mice with higher transgene expressions showed more severe phenotypes, but a subline, in which the copy number and expression of the transgene was reduced, showed a normal phenotype, indicating that the hTTRMet30 expression caused the malformation. Nax mice began to express the hTTRMet30 gene in the nasal placode from embryonic day 10.5 (E10.5), which was 2 days earlier than in the other transgenic lines with a normal phenotype. Excessive cell death was observed in the nasal placode of the E10.5 Nax embryos. In addition, the forced expression of hTTRMet30 in the nasal placode of transgenic mice resulted in similar phenotypes.
Conclusion: The expression of the hTTRMet30 gene in the nasal placode at E10.5 induced apoptotic cell death, leading to hypoplastic deformity in the frontonasal region.