Monozygotic twins with 45,X/46,XY mosaicism discordant for phenotypic sex
| Autor: | Marie Lambert, Ikuko Teshima, Claude-Lise Richer, Peter N. Ray, Louis Dallaire, Teresa Costa |
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| Rok vydání: | 1998 |
| Předmět: |
Male
medicine.medical_specialty Pathology X Chromosome Gonad Turner Syndrome Monozygotic twin Aneuploidy Biology Y chromosome Pregnancy Internal medicine Turner syndrome medicine Humans Sex Chromosome Aberrations Genetics (clinical) X chromosome Mosaicism Infant Newborn Karyotype Twins Monozygotic 45 X/46 XY mosaicism medicine.disease Phenotype medicine.anatomical_structure Endocrinology Karyotyping Female |
| Zdroj: | American Journal of Medical Genetics. 75:40-44 |
| ISSN: | 1096-8628 0148-7299 |
| DOI: | 10.1002/(sici)1096-8628(19980106)75:1<40::aid-ajmg9>3.0.co;2-u |
| Popis: | We report on two sets of monozygotic twins (MZTs) discordant for phenotypic sex ascertained at birth when the female twin was noted to have signs of the Ullrich-Turner syndrome. Cytogenetic investigations on the female of the first pair showed 45,X/46,XY mosaicism in lymphocytes but fibroblasts grown from two skin biopsies at separate sites and from gonadal tissue showed only 45,X cells. The male showed mosaicism in both blood lymphocytes and skin fibroblasts. In the second family, both twins also showed mosaicism in lymphocytes. The female had a 45,X karyotype in fibroblasts from skin and gonadal tissue, but in contrast to the first family, the male twin had a normal male karyotype in fibroblasts from skin biopsy and from connective tissue adjacent to the vas deferens. Discordant phenotypic sex in monozygotic twins is rare. As in our cases, the nine previously reported sets of MZTs all had mosaicism for sex chromosome abnormalities. A mitotic error leading to the loss of a Y chromosome prior to, accompanying, or following the twinning process would account for the reported combinations of karyotypes. |
| Databáze: | OpenAIRE |
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