Familial Hypercholesterolemia Biomarker Distribution in Dried Blood Spots

Area of Science:

• Neonatal screening
• Biomarker analysis
• Cardiovascular health

Background:

• Familial hypercholesterolemia (FH) is a genetic disorder leading to high cholesterol levels.
• Early detection of FH in newborns is crucial for preventing cardiovascular disease.
• Current newborn screening methods for FH are limited.

Purpose of the Study:

• To assess the distribution profiles of total cholesterol (TC), low-density lipoprotein cholesterol (LDL-C), and apolipoprotein B (apoB) in newborns.
• To evaluate these biomarkers as potential indicators for neonatal familial hypercholesterolemia screening.
• To consider confounding factors like gestational age, birth weight, sex, and race.

Main Methods:

• Analysis of 10,000 deidentified newborn dried blood spot cards.
• Measurement of TC, LDL-C, and apoB concentrations.
• Reporting concentrations as multiples of the median, focusing on 99th percentile values stratified by birth weight, gestational age, sex, and race.
• Exploration of seasonal biomarker variations.

Main Results:

• LDL-C and apoB distributions showed extreme elevations, indicating potential for screening.
• TC distribution was less elevated with a smaller range.
• Early gestational age and low birth weight were associated with higher 99th percentile apoB levels.
• Sex and race had minimal impact on biomarker concentrations.
• Biomarker levels were highest in winter compared to summer.

Conclusions:

• LDL-C and apoB exhibit distribution characteristics supportive of their use in neonatal FH screening.
• Further research is required to validate these biomarkers through correlation with molecular testing and later childhood cholesterol levels.