Androgen insensitivity syndrome is caused by mutations of the androgen receptor gene.
We report a female with an XY karyotype and androgen-producing testis.
We identified a novel AR splice donor site mutation in intron 4 (c.2173 + 2T > C).
This mutation resulted in the activation of a cryptic splice donor site in exon 4.
This rare splicing abnormality offers insight into the mechanisms of splicing defects.