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The unilateral urogenital anomalies (UUA) rat: a new mutant strain associated with unilateral renal agenesis, cryptorchidism, and malformations of reproductive organs restricted to the left side.

We established an inbred rat strain with unilateral urogenital anomalies from an incidentally identified male rat with unilateral renal agenesis and an undescended left testis. These rats were characterized by unilateral renal agenesis in both sexes, undescended testes with agenesis and hypoplasia of the accessory sex organs in male rats, and complete and partial agenesis of the uterine horn in female rats. All of these urogenital anomalies were unilateral and restricted to the left side; we named this phenotype unilateral urogenital anomalies (UUA). Breeding tests showed that these abnormalities were inherited as polygenic traits. The weight of right kidneys of affected rats was 1.7-fold higher than that of normal rats; histologically, glomerulosclerosis, tubular dilations, and tubular casts were detected at 30 wk of age. These alterations may have resulted from compensatory renal adaptation to the lack of 1 kidney. The cryptorchid left testes of affected male rats showed atrophy of seminiferous tubules and degeneration of spermatocytes and spermatids. These results indicate that the UUA rat may be a good model to study the etiology of unilateral renal agenesis accompanied by agenesis of the reproductive tract and to study compensatory alterations resulting from the congenital loss of 1 kidney.