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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Mash1 is required for glomus cell formation in the mouse carotid body.

The carotid body consists of chemoreceptive glomus cells, sustentacular cells and nerve endings. The murine carotid body, located at the carotid bifurcation, is always joined to the superior cervical ganglion of the sympathetic trunk. Glomus cells and sympathetic neurons are immunoreactive for the TuJ1, PGP9.5, tyrosine hydroxylase (TH) and neuropeptide Y (NPY) markers. Glomus cells are also immunoreactive for serotonin (5-HT). A targeted mutation of Mash1, a mouse homolog of the Drosophila achaete-scute complex, results in the elimination of sympathetic ganglia. In Mash1 null mutant mice, the carotid body primordium forms normally in the wall of the third arch artery at embryonic day (E) 13.0 and continues to develop, although the superior cervical ganglion is completely absent. However, no cells in the mutant carotid body display the TuJ1, PGP 9.5, TH, NPY and 5-HT markers throughout development. The absence of glomus cells was also confirmed by electron microscopy. The carotid body of newborn null mutants is composed of mesenchymal-like cells and nerve fibers. Many cells immunoreactive for the S-100 protein, a sustentacular cell marker, appear in the mutant carotid body during fetal development. The Mash1 gene is thus required for the genesis of glomus cells but not for sustentacular cells.[1]


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