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In the mouse, opening of the vaginal cavity to the skin is a late event, occurring around the fifth week of life; it can be induced in sexually immature mice by beta-estradiol injections. We have generated two lines of transgenic mice expressing the human Bcl2 protein in a variety of tissues. The vaginal cavity of the transgenic females remained permanently closed, a condition completely resistant to beta-estradiol injections; this was accompanied by a considerable distension of the genital tract. Histologic studies of vaginal sections at the time of opening to the skin in normal mice showed, by the TUNEL method which detects nuclei with fragmented DNA characteristic of apoptosis, that this event coincides with extensive apoptosis in the lower part of the vaginal mucosa, a process prevented in the bcl2 transgenic mice, which express Bcl2 in suprabasal epithelial cells and in subepithelial cells of the vaginal mucosa.

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The vagina of the mouse is closed at birth and does not open until the animal is 24 to 28 days of age, around the onset of sexual maturity. Mice with imperforate vaginas are submitted to The Jackson Laboratory Animal Health Diagnostic Laboratory because of marked distention of their abdomens due to mucometra. Differential diagnoses include abdominal umbilical abscessation, macerated fetuses, or neoplasia in these animals.

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A hypoplastic vagina opening can be observed on the affected animals. When the abdomen is opened, the uterine horns are markedly distended, thin walled and translucent. Clear to slightly cloudy mucous is obtained when the walls are cut.

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From to44 cases of imperforate vagina and mucometra were submitted for evaluation to the diagnostic laboratory. Affected mice of 14 different strains were examined from production colonies at The Jackson Laboratory. This represents a relatively rare, sporadic abnormality affecting female mice.

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The age at the time of submission ranged from 27 to days with a mean of days. Animals submitted exhibited extreme distention of the abdomen.

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Genetics vs. Symptoms The vagina of the mouse is closed at birth and does not open until the animal is 24 to 28 days of age, around the onset of sexual maturity.

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Occurrence From to44 cases of imperforate vagina and mucometra were submitted for evaluation to the diagnostic laboratory. References 1. Gruneberg H: Genetics of the Mouse.

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