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Surgical and genetic aspects of persistent müllerian duct syndrome
Abstract:
Persistent müllerian duct syndrome (PMDS) is characterized by the presence of a uterus, cervix, and fallopian tubes in an otherwise normally differentiated 46.XY male. During embryogenesis, regression of müllerian structures in normal males is mediated by antimüllerian hormone (AMH), also called müllerian inhibiting substance (MIS), produced by fetal Sertoli's cells. PMDS has been attributed to deficient AMH activity or to abnormalities in the AMH receptor. The authors report on two patients with PMDS in whom the abnormalities were discovered during surgery for inguinal hernia and cryptorchidism. During the initial operations in each case, testicular biopsies were obtained, and the gonads and müllerian elements were replaced in the pelvis. A second operative procedure, performed several months later, included proximal salpingectomies with dissection of the vasa deferentia on pedicles of myometrium. This permitted excision of the vestigial uterine corpus, leaving a tiny remnant of cervix with the vasa deferentia. The testes were further mobilized so that bilateral orchidopexies could be completed. In the first case, a molecular abnormality was present at position 377 of the first exon of the AMH gene. Thymine replaced cytosine, which altered a CGG arginine codon to a TGG tryptophan codon, rendering the AMH molecule unstable. The molecular abnormality in the first case differs from the first abnormality in AMH reported by Knebelmann et al, thus indicating heterogeneity in this condition. The molecular basis for deficient AMH activity in the second patient has not yet been defined. No molecular abnormalities were found in the exons of this patient's AMH gene.
Insights
Persistent Müllerian Duct Syndrome (PMDS) in 46,XY males involves the presence of female reproductive organs. This study identifies a novel AMH gene mutation causing PMDS, highlighting genetic heterogeneity.
Area of Science:
- Reproductive Endocrinology
- Human Genetics
- Developmental Biology
Background:
- Persistent Müllerian Duct Syndrome (PMDS) is a rare disorder where 46,XY individuals possess female internal reproductive structures (uterus, cervix, fallopian tubes).
- Müllerian duct regression in normal male fetuses is orchestrated by anti-Müllerian hormone (AMH), produced by Sertoli cells, and its receptor.
- PMDS is hypothesized to result from AMH deficiency or defects in its signaling pathway.
Observation:
- Two pediatric patients with PMDS presented with inguinal hernia and cryptorchidism.
- Surgical interventions included testicular biopsies, pelvic repositioning of gonads and Müllerian elements, and staged excision of Müllerian remnants.
- Specific surgical steps involved salpingectomy, vasa deferentia dissection from myometrium, uterine corpus excision, and orchidopexy.
Findings:
- A molecular analysis revealed a specific point mutation (C377T) in the AMH gene's first exon in the first patient, leading to an arginine-to-tryptophan substitution and an unstable AMH protein.
- This identified mutation differs from previously reported AMH gene abnormalities in PMDS, suggesting genetic heterogeneity.
- The molecular basis for AMH deficiency in the second patient remains undetermined, with no exonic mutations found in their AMH gene.
Implications:
- The discovery of a novel AMH gene mutation contributes to understanding the genetic underpinnings of PMDS.
- This finding underscores the importance of molecular genetic analysis in diagnosing and characterizing PMDS, potentially revealing new therapeutic targets.
- Further research is needed to elucidate the genetic etiology in cases like the second patient, advancing the comprehension of male reproductive development and AMDS-related disorders.
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