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Schimke Immuno-Osseous Dysplasia (SIOD) is a multisystem disorder that is inherited in an autosomal recessive pattern. It usually manifests first with growth failure. Other features of the disease are generally noted in the ensuing evaluation of the growth failure or develop in the following years. According to the severity of the clinical features and the age of onset, SIOD has been divided into an infantile or severe early-onset form and a juvenile or milder late-onset form. Affected individuals with early-onset manifest severe symptoms and have a mean age of death at 9.2 years. These individuals have died from strokes, severe opportunistic infections, bone marrow failure, complications of kidney failure, congestive heart failure, and unspecified lung disease. On the other hand, those with milder disease have survived into the fifth decade if symptomatically treated. However, severity and age of onset of symptoms do not invariably predict survival as a few of those with early-onset disease have survived into the third and fourth decade.

- National Organization for Rare Disorders

Signs & Symptoms

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SIOD is inherited in an autosomal recessive pattern. Recessive genetic disorders occur when an individual inherits an abnormal gene from each parent. If an individual receives one normal gene and one abnormal gene for the disease, the person will be a carrier for the disease, but usually will not show symptoms. The risk for two carrier parents to both pass the abnormal gene and, therefore, have an affected child is 25% with each pregnancy. The risk to have a child who is a carrier, like the parents, is 50% with each pregnancy. The chance for a child to receive normal genes from both parents is 25%. The risk is the same for males and females. continue…

Affected Populations

SIOD is panethnic with an unknown prevalence. As deduced from referrals and published birth rates, the incidence is approximately 1 per million live births in North America.


The diagnosis of SIOD is made on clinical findings. The most definitive diagnostic findings are skeletal dysplasia (spondyloepiphyseal dysplasia), renal dysfunction (urinary protein loss), T lymphocyte deficiency (particularly for naïve CD4 and CD8 T cells), dysmorphic facial features, and hyperpigmented macules. continue..

Standard Therapies

Treatments are selected to address individual symptoms as they develop. Renal transplantation effectively treats the renal disease, and bone marrow transplantation effectively treats the immunodeficiency and other hematological abnormalities.  continue..

- National Organization for Rare Disorders

So do not fear, for I am with you; do not be dismayed, for I am your God. I will strengthen you and help you; I will uphold you with my righteous right hand.
— Isaiah 41:10