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The novel contiguous gene syndrome of myotubular myopathy (MTM1), male hypogenitalism and deletion in Xq28:report of the first familial case

Bartsch O.a · Kreß W.b · Wagner A.a · Seemanova E.c
aInstitut für Klinische Genetik, Klinikum Carl Gustav Carus der Technischen Universität Dresden, Dresden; bInstitut für Humangenetik der Universität Würzburg, Würzburg (Germany); cDepartment of Clinical Genetics, Charles University Motol Hospital, Prague (Czech Republic) Cytogenet Cell Genet 85:310–314 (1999) (DOI:10.1159/000015284)



Hu et al. (1996) and Laporte et al. (1997) recently proposed a novel contiguous gene syndrome of myotubular myopathy, abnormal male genital development and deletion in Xq28. We studied a family where two male infants, both deceased, had myotubular myopathy and intersexual genitalia. Using FISH we detected in the mother a hemizygous deletion including the myotubularin gene MTM1 and F18 (a gene of yet unknown function). DNA studies with STR-markers (short tandem repeats) within and flanking the deleted segment confirmed the deletion in the family and were used for prenatal diagnosis. Our findings confirm the existence of this novel contiguous gene syndrome and support that the deletion of the F18 gene, or a neighboring gene, may cause ambiguous genitalia or severe hypospadias in males. The mother had low muscle power and marked menstrual irregularities which may indicate that she is a manifesting carrier and that the deletion may include a gene (F18 or other) for gonadal function in females.


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