High Density Lipoprotein Cholesterol Level Quantitative Trait Locus 3, is also known as high density lipoprotein cholesterol, low serum, 3. An important gene associated with High Density Lipoprotein Cholesterol Level Quantitative Trait Locus 3 is HDLC3 (High Density Lipoprotein Cholesterol, Low Serum, 3). Affiliated tissues include heart.