The following information may help to address your question:
The signs and symptoms of hyperlipoproteinemia type 1 usually begin during childhood. Approximately 25 percent of affected individuals develop symptoms before age 1. The characteristic features of hyperlipoproteinemia type 1 include:
Hyperlipoproteinemia type 1 is caused by mutations in the LPL gene. This gene provides instructions for producing an enzyme called lipoprotein lipase. This enzyme helps break down fats called triglycerides, which are carried by molecules called lipoproteins.
Mutations in the LPL gene lead to a reduction or elimination of lipoprotein lipase activity, which prevents the enzyme from effectively breaking down triglycerides. As a result, triglycerides attached to lipoproteins build up in the blood and tissues, leading to the signs and symptoms of hyperlipoproteinemia type 1.