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Isolation and Analysis of Plasma Lipoproteins by Ultracentrifugation

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Published on: January 28, 2021

Phenotypic Differences Between Polygenic and Monogenic Hypobetalipoproteinemia.

Antoine Rimbert¹, Xavier Vanhoye², Dramane Coulibaly²

¹Université de Nantes, CNRS, INSERM, l'institut du thorax, France (A.R., M.P., M.W., P.L., R.R., B.C.).

Arteriosclerosis, Thrombosis, and Vascular Biology

|November 19, 2020

Summary

This summary is machine-generated.

Genetic diagnosis is crucial for primary hypobetalipoproteinemia. Monogenic forms show higher liver steatosis and injury risk than polygenic forms, necessitating personalized patient follow-up.

Keywords:

apolipoproteins cholesterol hypobetalipoproteinemias liver diseases mutation polygenic risk score

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Area of Science:

Genetics
Hepatology
Cardiovascular Medicine

Background:

Primary hypobetalipoproteinemia is defined by low LDL-C levels, often stemming from APOB or PCSK9 gene mutations, with a polygenic cause suspected in some cases.
Patients with hypobetalipoproteinemia face an elevated risk of nonalcoholic fatty liver disease and steatohepatitis.
Understanding the genetic basis is key to managing associated hepatic complications.

Purpose of the Study:

To compare hepatic alterations in patients with monogenic, polygenic, and idiopathic primary hypobetalipoproteinemia.
To evaluate the utility of a polygenic risk score in differentiating hypobetalipoproteinemia origins.
To investigate the association between genetic subtypes and liver disease prevalence.

Main Methods:

Targeted next-generation sequencing was employed in 111 hypobetalipoproteinemia patients.
A dedicated polygenic risk score for LDL-C was used to assess genetic origins.
Hepatic function was evaluated using ultrasonography and liver enzyme levels.

Main Results:

Of 111 patients, 36% had monogenic, 34% polygenic, and 30% idiopathic hypobetalipoproteinemia.
Monogenic hypobetalipoproteinemia was linked to significantly lower LDL-C and apolipoprotein B levels compared to polygenic forms.
Liver steatosis affected 81% of monogenic cases versus 29% of polygenic cases; liver injury was observed in 47% of monogenic versus 0% of polygenic patients.

Conclusions:

Genetic diagnosis is vital for primary hypobetalipoproteinemia patient care.
Polygenic hypobetalipoproteinemia is associated with a reduced risk of liver steatosis and injury compared to monogenic forms.
Polygenic risk scores aid in personalized patient follow-up and management strategies.