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Updated: Oct 7, 2026

Osmotic Avoidance in Caenorhabditis elegans: Synaptic Function of Two Genes, Orthologues of Human NRXN1 and NLGN1, as Candidates for Autism
Published on: December 11, 2009
The yeast endosomal Na+/H+ exchanger, Nhx1, confers osmotolerance following acute hypertonic shock
1Department of Physiology, The Johns Hopkins University School of Medicine, 725 N. Wolfe Street, Baltimore MD 21205, USA1.
Abstract:
Osmotolerance in yeast is regulated by at least two distinct mechanisms. The acquired response occurs following long-term exposure to hypertonic medium and requires the induction of the HOG-MAP (high-osmolarity glycerol mitogen-activated protein) kinase cascade to increase levels of the osmolyte glycerol. The acute response occurs following sudden exposure to high osmotica and appears to be dependent on normal vacuole function. In this study it is reported that the yeast endosomal/prevacuolar Na+/H+ exchanger Nhx1 contributes to osmotolerance following sudden exposure to hyperosmotic media. Vacuolar shrinkage and recovery in response to osmotic shock was altered in the (delta)nhx1 null mutant. Our results also show that the osmotolerance conferred by Nhx1 contributes to the postdiauxic/stationary-phase resistance to osmotic stress and allows for the continued growth of cells until the acquired osmotolerance response can occur.
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