Smith Lemli Opitz syndrome - Medtick

Smith Lemli Opitz syndrome

What is it?

Smith-Lemli-Opitz syndrome (SLOS) is a variable genetic disorder caused by the way one produce cholesterol in our bodies.

  • Cholesterol is a major component of cell membranes and helps form myelin, a substance which protects brain cells (neurons).
  • It also plays a significant role in proper digestion.
  • This condition cause a lack of cholesterol production and as a result it also allows toxic byproducts of cholesterol to build up within the body, which hinders development and growth in multiple bodily systems

  • The severity of SLOS varies greatly in affected individuals, even in the same family, and some have normal development and only minor birth defects.

National Organization for Rare Disorders Smith-Lemli-Opitz syndrome

Cause

  • Deficiency in the enzyme 7-dehydrocholesterol reductase that results in an abnormality in cholesterol metabolism.
  • It is an inherited as an autosomal recessive genetic disorder.
    • Family history autosomal recessive disorder (Both parents who are carriers of  the recessive genes responsible and can cause a 25% chance of their sibling getting this condition)
    • If both parents are carriers, a child has a 25 percent chance of inheriting two recessive genes (and getting this condition), a 50 percent chance of getting one dominant and one recessive gene (and becoming a carrier), and a 25 percent chance of getting two dominant genes (and remaining unaffected).
  • All individuals carry 4-5 abnormal genes. Parents who are close relatives (consanguineous) have a higher chance than unrelated parents to both carry the same abnormal gene, which increases the risk to have children with a recessive genetic disorder.

National Organization for Rare Disorders Smith-Lemli-Opitz syndrome

Symptoms

(Symptoms can vary from individual to individual)

Complications /Information to beware of/General tips:

Medical Emergency Condition

And/or do not wait, phone for an ambulance if have or develop:


This condition can lead to:


This condition may show similar symptoms to:


These conditions are very difficult to diagnose, a specialist opinion is required.

OMIM is intended for use primarily by physicians and other professionals concerned with genetic disorders, by genetics researchers, and by advanced students in science and medicine. While the OMIM database is open to the public, users seeking information about a personal medical or genetic condition are urged to consult with a qualified physician for diagnosis and for answers to personal questions.

Detailed Information

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  • NHS

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