Some scientists have dubbed this compilation of male disorders «testicular
dysgenesis syndrome,» and suggested that hormone - disrupting environmental contaminants play a role.
This condition is designated 46, XY pure gonadal
dysgenesis with female somatic phenotype (Swyer's syndrome, affecting one in 80,000 births).
Her condition, called mixed gonadal
dysgenesis, strikes roughly one in 100,000 babies.
Believed to be suffering from a combination of caudal regression syndrome, sacrocaudal
dysgenesis and spina bifida, the pup also suffers from swimmer puppy syndrome, where his legs are spread out so it flattens his chest and puts pressure on his organs, making it difficult for him to move around.
Most common is probably merle ocular
dysgenesis — the complex of defects observed in dogs that have inherited two copies of the merle gene.
Merle ocular
dysgenesis also occurs, but since we know this is the result of breeding two merles together the source of the problem is obvious and easy to avoid.
With respect to the Merle gene and ocular
dysgenesis, these abnormalities are congenital, which means they are present at birth.
Other useful diagnostic aids include comparison of height with that of littermates, evidence of delayed epiphyseal closure or
dysgenesis on skeletal radiographs, and skin biopsy.
Recognized causes of congenital hypothyroidism in cats include intrathyroidal defects in thyroid hormone biosynthesis (dyshormonogenesis), an inability of the thyroid gland to respond to TSH, and thyroid
dysgenesis.
Radiographic signs of epiphyseal
dysgenesis (underdeveloped epiphyses throughout the long bones), shortened vertebral bodies, and delayed epiphyseal closure are common.
Congenital primary hypothyroidism may result from one of various forms of thyroid
dysgenesis (eg, athyreosis, thyroid hypoplasia) or from dyshormonogenesis (usually an inherited inability to organify iodide).
120 For a discussion of imprinting and its role in speciation, see P.B. Vrana, J.A. Fossella, P. Matteson, T. del Rio, M.J.O. O'Neill, S.M. Tilgham, «Genetic and epigenetic incompatibilities underlie hybrid
dysgenesis in Peromyscus,» Nature Genetics 25:120 - 125 (2000).
Provided therapeutic activities for boy with segmental spinal
dysgenesis to increase independence with occupations