Mouse Ror2 receptor tyrosine kinase is required for the heart development and limb formation
Article first published online: 25 DEC 2001
Genes to Cells
Volume 5, Issue 1, pages 71–78, January 2000
How to Cite
Takeuchi, S., Takeda, K., Oishi, I., Nomi, M., Ikeya, M., Itoh, K., Tamura, S., Ueda, T., Hatta, T., Otani, H., Terashima, T., Takada, S., Yamamura, H., Akira, S. and Minami, Y. (2000), Mouse Ror2 receptor tyrosine kinase is required for the heart development and limb formation. Genes to Cells, 5: 71–78. doi: 10.1046/j.1365-2443.2000.00300.x
- Issue published online: 25 DEC 2001
- Article first published online: 25 DEC 2001
- Cited By
A mouse receptor tyrosine kinase (RTK), mRor2, which belongs to the Ror-family of RTKs consisting of at least two structurally related members, is primarily expressed in the heart and nervous system during mouse development. To elucidate the function of mRor2, we generated mice with a mutated mRor2 locus.
Mice with a homozygous mutation in mRor2 died just after birth, exhibiting dwarfism, severe cyanosis, and short limbs and tails. Whole-mount in situ hybridization analysis showed that mRor2 was expressed in the branchial arches, heart and limb/tailbuds, in addition to the developing nervous system. The mutants had cardiac septal defects, mainly a ventricular septal defect. In addition, an examination of the skeletal systems revealed that the mutants had shorter limbs, vertebrae and facial structure, with a particular defect in their distal portions, and that almost no calcification was observed in their distal limbs. Histological examination showed abnormalities in the chondrocytes.
Our findings suggest that mRor2 plays essential roles in the development of the heart and in limb/tail formation, in particular cardiac septal formation and ossification of distal portions of limbs and tails.