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  • 1
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The persistent Müllerian duct syndrome (PMDS) is a rare form of male pseudohermaphroditism, characterized by the persistence of Müllerian derivatives in otherwise normal males. Two mutations, present in the homozygous state, have been previously described in such patients. The present observation is the first example of compound heterozygosity in this condition. DNA was obtained from a 3-month-old patient with PMDS, in whom no serum anti-Müllerian hormone (AMH) could be detected by enzyme-linked immunosorbent assay. Sequencing of cloned polymerase chain reaction amplified fragments of the AMH gene revealed a 14-bp deletion in the second exon of the maternal allele; this deletion disrupted the open reading frame. It occurred at a site containing two 8-bp direct repeats flanking a 6-bp sequence and removed one whole repeat plus all of the intervening sequence. It may be the result of a slipped mispairing at the DNA replication fork. The paternal allele contains a stop mutation in the third exon. These two mutations, impairing both AMH alleles, are consistent with the occurrence of PMDS, and are shared with a phenotypically normal younger sister. In this family, various other mutations, devoid of physiological significance, suggest that the AMH gene is highly polymorphic.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1076
    Keywords: Key words Cryptorchidism ; Testicular torsion ; Anorchism ; Persistent Müllerian duct syndrome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The persistent Müllerian duct syndrome, characterized by the presence of uterus and tubes in males, is a familial disorder due to defects of synthesis or action of anti-Müllerian hormone, a Sertoli cell glycoprotein responsible for the regression of Müllerian derivatives in normal male fetuses. Patients are normally virilized and testicular production of testosterone is normal. Both testes may be cryptorchid; alternatively, one may be descended into the inguinal canal or scrotum, together with the Müllerian derivatives, a condition known as "hernia uteri inguinalis". We have recently observed three patients affected by the persistent Müllerian duct syndrome who experienced progressive degeneration of testicular tissue. In two, functional testicular tissue was still present some months after birth, but deteriorated progressively later. In one patient, testicular tissue was already absent at birth, but the normal virilization of external genitalia indicated that testicular degeneration must have occurred late during fetal life, after the expected time of regression of male Müllerian ducts. Conclusion The high incidence of degeneration of testicular tissue in the persistent Müllerian duct syndrome could be indirectly linked to anatomical abnormalities which could favour testicular torsion, known to induce testicular regression.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1076
    Keywords: Anti-Müllerian hormone (AMH) ; Müllerian-inhibiting substance (MIS) ; Intersex ; Male pseudohermaphroditism ; Uterus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The persistent Müllerian duct syndrome is characterized by the retention of Müllerian derivatives in patients otherwise normally virilized. Clinically, the persistence of uterus and tubes leads either to cryptorchidism or inguinal hernia, depending on whether or not the Müllerian derivatives can be mobilized during testicular descent. The condition is usually discovered at surgery, however preoperative sonography could allow the diagnosis to be made preoperatively. The molecular basis of the persistent Müllerian duct syndrome is heterogeneous, and is reflected by wide variations in the serum concentration of anti-Müllerian hormone. Some cases are apparently due to end-organ resistance, and are associated with normal serum levels of the hormone. Others, characterized by absent or low hormone concentrations, can be explained by mutations of the gene coding for anti-Müllerian hormone, which are distributed along the whole length of the coding region.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1076
    Keywords: Crytorschidism ; Testicular torsion ; Anorchism ; Persistent Müllerian duct syndrome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The presistent Müllerian duct syndrome, characterized by the presence of uterus and tubes in males, is a familial disorder due to defects of synthesis or action of anti-Müllerian hormone, a Sertoli cell glycoprotein responsible for the regression of Müllerian derivatives in normal male fetuses. Patients are normally virilized and testicular production of testosterone is normal. Both testes my be cryptorchild; alternatively, one may be descended into the inguinal canal or scrotum, together with the Müllerian derivatives, a condition known as “hernia uteri inguinalis”. We have recently observed three patients affected by the presistent Müllerian duct syndrome who experienced progressive degeneration of testicular tissue. In two, functional testicular tissue was still present some months after birth, but deteriortated progressively later. In one patient, testicular tissue was already absent at birth, but the normal virilization of external genitalia indicated that testicular degeneration must have occurred lat during fetal life, after the expected time of regression of male Müllerian ducts. Conclusion The high incidence of degeneration of testicular tissue in the presistent Müllerian duct syndrome could be indirectly linked to anatomical abnormalities which could favour testicular torsion, known to induce testicular regression.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Anti–Müllerian hormone (AMH) and its receptor are involved in the regression of Müllerian ducts in male fetuses. We have now cloned and mapped the human AMH receptor gene and provide genetic proof that it is required for AMH signalling, by identifying a mutation in the AMH receptor ...
    Type of Medium: Electronic Resource
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