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Persistence of Müllerian remnants in complete androgen insensitivity syndrome
D Damiani1, M A Mascolli, M J Almeida
1Pediatric Endocrinology Unit, Instituto da Criança, Hospital das Clinicas, São Paulo University Medical School, Brazil. durvald@csf.com.br
Abstract:
One of the unusual findings in androgen insensitivity syndrome (AIS) is the persistence of Mullerian derivatives. Several hypotheses have been advanced to explain such persistence: the coincidental occurrence of mutations affecting the androgen receptor (AR) and the synthesis and/or action of anti-Müllerian hormone (AMH); the loss of AMH paracrine action due to early testicular descent; the exposure to drugs such as diethylstilbestrol. We describe a patient with complete AIS for whom surgical and laboratory findings rule out all these hypotheses. She has a missense mutation on the AR gene but no mutations were detected on the genes coding for AMH and AMH receptor. The gonads were found very close to the Mullerian structures (enough to exert a paracrine action), gonadal tissue stained positively for AMH, and yet Mullerian derivatives were present and well developed. These findings indicate the possibility of interactions between the androgen receptor and AMH action.
Insights
In androgen insensitivity syndrome (AIS), Mullerian derivatives persist despite normal anti-Müllerian hormone (AMH) action. This suggests a novel interaction between androgen receptor signaling and AMH in AIS.
Area of Science:
- Endocrinology
- Genetics
- Reproductive Biology
Background:
- Androgen insensitivity syndrome (AIS) typically involves androgen receptor (AR) dysfunction.
- Persistence of Mullerian derivatives in AIS is unusual and has several proposed explanations.
- These include AR and anti-Müllerian hormone (AMH) gene mutations, loss of AMH paracrine action, or drug exposure.
Observation:
- A patient with complete AIS presented with persistent Mullerian derivatives.
- Genetic analysis revealed a missense mutation in the AR gene.
- No mutations were found in AMH or AMH receptor genes.
Findings:
- The patient's gonads were located close to Mullerian structures, allowing for potential paracrine AMH action.
- Gonadal tissue tested positive for AMH.
- Despite these factors, Mullerian derivatives remained well-developed.
Implications:
- The findings challenge existing hypotheses for Mullerian derivative persistence in AIS.
- This case suggests a potential interaction between androgen receptor signaling and AMH action.
- Further research is needed to elucidate the mechanisms underlying this interaction.