Left-asymmetric expression of Galanin in the linear heart tube of the mouse embryo is independent of the nodal co-receptor gene cryptic

Item Type:	Article
Title:	Left-asymmetric expression of Galanin in the linear heart tube of the mouse embryo is independent of the nodal co-receptor gene cryptic
Creators Name:	Schweickert, A. and Deissler, K. and Britsch, S. and Albrecht, M. and Ehmann, H. and Mauch, V. and Gaio, U. and Blum, M.
Abstract:	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.
Keywords:	Galanin, Left-Right Asymmetry, Conduction System, inv, iv, Cryptic, Animals, Mice
Source:	Developmental Dynamics
ISSN:	1058-8388
Publisher:	Wiley
Volume:	237
Number:	12
Page Range:	3557-3564
Date:	December 2008
Official Publication:	https://doi.org/10.1002/dvdy.21638
PubMed:	View item in PubMed

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