Smith-Lemli-Opitz Syndrome synonyms

Smith-Lemli-Opitz syndrome (SLOS) is an autosomal recessive cholesterol synthesis disorder, also widely referred to as 7-dehydrocholesterol reductase deficiency or RSH syndrome. While historical literature may use various eponyms, Smith-Lemli-Opitz syndrome is the internationally recognized clinical name used by geneticists and medical professionals today.

What are the common synonyms for Smith-Lemli-Opitz syndrome?

In medical literature, you may encounter several names for Smith-Lemli-Opitz syndrome. These synonyms often reflect the historical progression of medical understanding. The most common alternative names include:

• 7-Dehydrocholesterol reductase deficiency: This describes the underlying biochemical defect (the enzyme deficiency) and is the most precise biochemical name.


• RSH syndrome: An acronym derived from the surnames of the original investigators (Opitz, Smith, and Lemli) combined with the "H" for the patient cohort.


• SLOS: The standard medical abbreviation used in clinical charts and research papers.


• Cholesterol deficiency syndrome: A descriptive term sometimes used to explain the metabolic nature of Smith-Lemli-Opitz syndrome to families.

Why does Smith-Lemli-Opitz syndrome have multiple names?

The naming of Smith-Lemli-Opitz syndrome reflects the history of genetic discovery. When David W. Smith, Luc Lemli, and John M. Opitz first described the condition in 1964, they identified it based on a collection of physical features (syndromic classification). As medical technology advanced, researchers discovered that the condition was caused by a mutation in the DHCR7 gene, which prevents the body from making cholesterol. Consequently, the name 7-dehydrocholesterol reductase deficiency was introduced to reflect the specific metabolic cause, while the original eponym remains the preferred clinical term for diagnostic and classification purposes.

How is the condition classified in official medical systems?

To ensure consistency across global healthcare systems, Smith-Lemli-Opitz syndrome is indexed under specific codes. Understanding these can help when navigating medical records or insurance documentation:

1. Orphanet: Classified under ORPHA:3161, which provides standardized information for rare disease networks.


2. OMIM (Online Mendelian Inheritance in Man): Listed as #270400, reflecting its status as a distinct genetic entity.


3. ICD-10/11: The syndrome is typically coded under Q87.8 (other specified congenital malformation syndromes) or specific metabolic disorder codes depending on the clinical manifestation.

Which name should patients and families use?

While you may see "RSH syndrome" or "7-dehydrocholesterol reductase deficiency" in older medical records or research papers, Smith-Lemli-Opitz syndrome is the name currently preferred by clinicians, genetic counselors, and support organizations. Using the standard name Smith-Lemli-Opitz syndrome ensures that you are accessing the most current research, clinical trial data, and community support. Within the DiseaseMaps.org community, 61 individuals currently share their experiences under the primary diagnosis of Smith-Lemli-Opitz syndrome, highlighting the importance of using this consistent terminology for networking and advocacy.

Next steps

• Consult with a clinical geneticist to verify your specific genetic variant and understand its implications for family planning.


• Request that your healthcare provider use the term "Smith-Lemli-Opitz syndrome" in all referral letters to maintain consistency in your medical records.


• Connect with the 61 members of our community on DiseaseMaps.org to share experiences and find peer support.


• Visit the NIH GARD website to stay updated on the latest clinical research and potential therapeutic interventions.

Medical disclaimer: This information is for educational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Smith-Lemli-Opitz syndrome.


• Orphanet: 7-dehydrocholesterol reductase deficiency (ORPHA:3161).


• OMIM: #270400, Smith-Lemli-Opitz syndrome.


• DiseaseMaps.org: Community database for rare disease patient experiences.