Prenatal Screening For Smith-Lemli-Opitz Syndrome

Status Completed

Clinical Trial Summary

Smith-Lemli-Opitz Syndrome (SLOS) is a genetic condition that causes mental retardation and other birth defects. This study will evaluate a new prenatal screening test for SLOS.

Clinical Trial Description

SLOS is an inherited metabolic disorder characterized by moderate to severe mental retardation and congenital anomalies. SLOS is caused by a deficiency of the enzyme 7-dehydrocholesterol reductase and the resulting defect in the conversion of 7-dehydrocholesterol to cholesterol. SLOS can now be reliably detected prenatally by analysis of amniotic fluid 7-8- dehydrocholesterol (7/8-DHC) levels. Unconjugated estriol (uE3) is one of the maternal serum analytes currently measured routinely to screen for Down syndrome. This analyte requires cholesterol as a precursor, and its concentration in maternal serum is lower when the fetus has SLOS.

Currently, there is no national standard for the approach taken in prenatal screening; existing programs vary both in availability and in the protocol and algorithms used. The major barrier to identifying SLOS prenatally is the absence of sound screening methodology that takes into account the detection rate, the false positive rate, and the prevalence. This study will evaluate the efficacy of routinely identifying Smith-Lemli-Opitz Syndrome (SLOS) prenatally.

The screening model in this study is based on data from SLOS pregnancies and will be tested in 1,000,000 pregnancies in which maternal serum uE3, alpha-fetoprotein, and human chorionic gonadotrophin measurements are being done as part of routine screening for Down syndrome. The screening false positive rate is projected to be 0.34%, the detection rate 62%, and the odds of being affected given a positive screening result 1:70. These rates all compare favorably with prenatal screening tests now in routine use. The study will also determine whether SLOS diagnostic studies can be carried out in maternal urine or serum, rather than amniotic fluid, thereby avoiding invasive procedures.

Participants in this study will be pregnant women undergoing amnioscentisis during the second trimester. Women who have a positive test for SLOS will be asked to provide a urine and blood sample. The study will collect data on patient demographics and family history; data will also be obtained from the participant’s ultrasound, karyotype, alpha-fetoprotein, maternal serum screening, and SLOS reports. Three months after the pregnancy due date, a genetic counselor will contact the participant to obtain basic information about the baby’s delivery and health. ;

Study Design

Observational Model: Defined Population, Primary Purpose: Screening, Time Perspective: Longitudinal

Related Conditions & MeSH terms

Clinical Trial Details

NCT number	NCT00070850
Study type	Observational
Source	Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
Contact
Status	Completed
Phase	Phase 2
Start date	April 2001
Completion date	July 2005

View Details

See also
Status	Clinical Trial	Phase
Completed	`NCT03442582` - Afluria Pregnancy Registry
Terminated	`NCT02161861` - Improvement of IVF Fertilization Rates, by the Cyclic Tripeptide FEE - Prospective Randomized Study	N/A
Not yet recruiting	`NCT05934318` - L-ArGinine to pRevent advErse prEgnancy Outcomes (AGREE)	N/A
Enrolling by invitation	`NCT05415371` - Persistent Poverty Counties Pregnant Women With Medicaid	N/A
Completed	`NCT04548102` - Effects of Fetal Movement Counting on Maternal and Fetal Outcome Among High Risk Pregnant Woman	N/A
Completed	`NCT03218956` - Protein Requirement During Lactation	N/A
Completed	`NCT02191605` - Computer-delivered Screening & Brief Intervention for Marijuana Use in Pregnancy	N/A
Completed	`NCT02223637` - Meningococcal Quadrivalent CRM-197 Conjugate Vaccine Pregnancy Registry
Recruiting	`NCT06049953` - Maternal And Infant Antipsychotic Study
Completed	`NCT02577536` - PregSource: Crowdsourcing to Understand Pregnancy
Not yet recruiting	`NCT06336434` - CREATE - Cabotegravir & Rilpivirine Antiretroviral Therapy in Pregnancy	Phase 1/Phase 2
Not yet recruiting	`NCT05412238` - Formulation and Evaluation of the Efficacy of Macro- and Micronutrient Sachets on Pregnant Mothers and Children Aged 6-60 Months	N/A
Not yet recruiting	`NCT04786587` - Alcohol Self-reporting During Pregnancy. AUTOQUEST Study.
Not yet recruiting	`NCT05028387` - Telemedicine Medical Abortion Service Using the "No-test" Protocol in Ukraine and Uzbekistan.
Completed	`NCT02783170` - Safety and Immunogenicity of Simultaneous Tdap and IIV in Pregnant Women	Phase 4
Completed	`NCT02683005` - Study of Hepatitis C Treatment During Pregnancy	Phase 1
Recruiting	`NCT02564250` - Maternal Metabolism and Pregnancy Outcomes in Obese Pregnant Women	N/A
Recruiting	`NCT02507180` - Safely Ruling Out Deep Vein Thrombosis in Pregnancy With the LEFt Clinical Decision Rule and D-Dimer
Recruiting	`NCT02619188` - Nutritional Markers in Normal and Hyperemesis Pregnancies	N/A
Completed	`NCT02520687` - Effects of Dietary Nitrate in Hypertensive Pregnant Women	Phase 1