What happens if the ABCA1 transport protein does not function?

What is ABCA 1?

According to the NIH library: this gene belongs to a group of genes which provides instructions for making proteins that transport molecules across cell membranes. The ABCA1 protein is produced in many tissues, with high amounts found in the liver and in immune system cells called macrophages. This protein moves cholesterol and certain fats called phospholipids across the cell membrane to the outside of the cell.