Different Phenotypes in a Family With Androgen Insensitivity Caused by the Same M780I Point Mutation in the Androgen Receptor Gene
August 1996
in “
The Journal of Clinical Endocrinology & Metabolism
”
Studysummary This study reports that the same androgen receptor gene mutation within a family can lead to both complete and partial androgen insensitivity syndromes, suggesting that genetic defects alone may not predict clinical phenotype. Our plain-language summary of this paper — not a Tressless recommendation.
This study reported that the same M780I point mutation in the androgen receptor (AR) gene led to different phenotypes within the same family, highlighting variability in androgen insensitivity (AI) syndromes. Among three patients, two exhibited a feminine phenotype indicative of complete AI, while the third was male with partial AI, perineoscrotal hypospadias, and cryptorchidism. Despite having the same mutation, differences in 5 alpha-reductase activity and AR binding capacity were observed, with higher levels in the male patient. The study concluded that the same AR gene mutation can result in varying clinical phenotypes, suggesting that molecular defects alone may not predict AI phenotypes in families.
