Insuficiencia ovárica primaria familiar asociada a una translocación X;autosoma

primary ovarian insufficiency (poi) is a clinical condition characterized by ovarian dysfunction before 40 years of age. in 8-9 % of patients, both familial and sporadic chromosome abnormalities have been reported. these include numerical abnormalities such as monosomy or trisomy x, partial aneuploidies, such as deletions or isochromosomes, and structural abnormalities such as x;autosomal translocation (xat). we report the case of a patient diagnosed with hypergonadotropic hypogonadism at the age of 18, whose cytogenetic study revealed a formula 46,x,t(x;11)(q23;q22), interpreted as an x;autosome balanced translocation with breakpoint in the critical region for normal ovarian differentiation. at the age of 25, under hormone replacement therapy, the patient became pregnant. she gave birth to a girl with normal growth and development, with thelarche and menarche at 11 years old. at the age of 13 years and 3 months, because of an arrest of pubertal development, she was diagnosed with hypergonadotropic hypogonadism. the cytogenetic study detected the x;autosome balanced translocation inherited from her mother. women with x;autosome balanced translocation frequently develop premature ovarian failure because of breakpoints in the critical region of the x chromosome from xq13 to xq27. in conclusion, we report the case of two patients (mother and daughter) with a diagnosis of xat, and discuss molecular genetics issues related to alterations of x chromosome segments involved in ovarian function, as well as the consequences for potential offspring.