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Lorenz-Depiereux, B. ; Guido, V.E.* ; Johnson, K.R.* ; Zheng, Q.Y.* ; Gagnon, L.H.* ; Bauschatz, J.D.* ; Davisson, M.T.* ; Washburn, L.L.* ; Donahue, L.R.* ; Strom, T.M. ; Eicher, E.M.*

New intragenic deletions in the Phex gene clarify X-linked hypophosphatemia-related abnormalities in mice.

Mamm. Genome 15, 151-161 (2004)

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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.

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X-linked hypophosphatemic rickets (XLH) in humans is caused by mutations in the PHEX gene. Previously, three mutations in the mouse Phex gene have been reported: Phex ^Hyp, Gy, and Phex ^Ska1. Here we report analysis of two new spontaneous mutations in the mouse Phex gene, Phex ^Hyp-2J and Phex ^Hyp-Duk. Phex ^Hyp-2J and Phex ^Hyp-Duk involve intragenic deletions of at least 7.3 kb containing exon 15, and 30 kb containing exons 13 and 14, respectively. Both mutations cause similar phenotypes in males, including shortened hind legs and tail, a shortened square trunk, hypophosphatemia, hypocalcemia, and rachitic bone disease. In addition, mice carrying the Phex ^Hyp-Duk mutation exhibit background-dependent variable expression of deafness, circling behavior, and cranial dysmorphology, demonstrating the influence of modifying genes on Phex-related phenotypes. Cochlear cross-sections from Phex ^Hyp-2J/Y and Phex ^Hyp-Duk/Y males reveal a thickening of the temporal bone surrounding the cochlea with the presence of a precipitate in the scala tympani. Evidence of the degeneration of the organ of Corti and spiral ganglion also are present in the hearing-impaired Phex ^Hyp-Duk/Y mice, but not in the normal-hearing Phex ^Hyp-2J/Y mice. Analysis of the phenotypes noted in Phex ^Hyp-Duk/Y an Phex ^Hyp-2J/Y males, together with those noted in Phex ^Ska1/Y and Phex ^Hyp/Y males, now allow XLH-related phenotypes to be separated from non-XLH-related phenotypes, such as those noted in Gy/Y males. Also, identification of the genetic modifiers of hearing and craniofacial dysmorphology in Phex ^Hyp-Duk/Y mice could provide insight into the phenotypic variation of XLH in humans.

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