Special Issue Research Article
Left-asymmetric expression of Galanin in the linear heart tube of the mouse embryo is independent of the nodal co-receptor gene cryptic
Article first published online: 4 SEP 2008
Copyright © 2008 Wiley-Liss, Inc.
Special Issue: Special Focus on Left-Right Asymmetry
Volume 237, Issue 12, pages 3557–3564, December 2008
How to Cite
Schweickert, A., Deissler, K., Britsch, S., Albrecht, M., Ehmann, H., Mauch, V., Gaio, U. and Blum, M. (2008), Left-asymmetric expression of Galanin in the linear heart tube of the mouse embryo is independent of the nodal co-receptor gene cryptic. Dev. Dyn., 237: 3557–3564. doi: 10.1002/dvdy.21638
- Issue published online: 20 NOV 2008
- Article first published online: 4 SEP 2008
- Manuscript Accepted: 30 MAY 2008
- DFG. Grant Number: BL285/6
- left-right asymmetry;
- conduction system;
Only very few left/right asymmetrically expressed genes are known in the mammalian embryo. In a screen for novel factors we identified the gene encoding the neuropeptide Galanin in mouse. At embryonic day (E) 8.5 asymmetric mRNA transcription was found in the left half of the linear heart tube. During heart looping and morphogenesis expression became restricted to the atrio-ventricular (AV) canal, followed by specific staining of the AV-node and AV-rings in the four-chambered heart. Expression was inverted in inv/inv and randomized in homozygous iv mutant embryos. Left-sided heart-specific transcription of mouse Gal thus should be controlled by the left-right pathway. The asymmetric pattern was retained in cryptic mutant embryos, in which the Nodal signaling cascade is disrupted. Surprisingly, Pitx2c was found to be expressed in 50% of cryptic mutant hearts as well, suggesting that some aspects of asymmetric gene expression in the heart are independent of cryptic. Developmental Dynamics 237:3557–3564, 2008. © 2008 Wiley-Liss, Inc.