Journal Article

Long-range activation of <i>Sox9</i> in <i>Odd Sex</i> (<i>Ods</i>) mice

Yangjun Qin, Ling-kun Kong, Christophe Poirier, Cavatina Truong, Paul A. Overbeek and Colin E. Bishop

in Human Molecular Genetics

Volume 13, issue 12, pages 1213-1218
Published in print June 2004 | ISSN: 0964-6906
Published online April 2004 | e-ISSN: 1460-2083 | DOI:
Long-range activation of Sox9 in Odd Sex (Ods) mice

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The Odd Sex mouse mutation arose in a transgenic line of mice carrying a tyrosinase minigene driven by the dopachrome tautomerase (Dct) promoter region. The minigene integrated 0.98 Mb upstream of Sox9 and was accompanied by a deletion of 134 kb. This mutation causes female to male sex reversal in XX Ods/+ mice, and a characteristic eye phenotype of microphthalmia with cataracts in all mice carrying the transgene. Ods causes sex reversal in the absence of Sry by upregulating Sox9 expression and maintaining a male pattern of Sox9 expression in XX Ods/+ embryonic gonads. This expression, which begins at E11.5, triggers downstream events leading to the formation of a testis. We report here that the 134 kb deletion, in itself, is insufficient to cause sex reversal. We demonstrate that in Ods, the Dct promoter is capable of acting over a distance of 1 Mb to induce inappropriate expression of Sox9 in the retinal pigmented epithelium of the eye, causing the observed microphthalmia. In addition, it induces Sox9 expression in the melanocytes where it causes pigmentation defects. We propose that Ods sex reversal is due to the Dct promoter element interacting with gonad-specific enhancer elements to produce the observed male pattern expression of Sox9 in the embryonic gonads.

Journal Article.  3559 words.  Illustrated.

Subjects: Genetics and Genomics

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