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The official name of this gene is “low density lipoprotein receptor-related protein 2.”
LRP2 is the gene's official symbol. The LRP2 gene is also known by other names, listed below.
The LRP2 gene provides instructions for making a protein called megalin, which functions as a receptor. Receptor proteins have specific sites into which certain other proteins, called ligands, fit like keys into locks. Together, ligands and their receptors trigger signals that affect cell development and function. Megalin has many ligands involved in various body processes, including the absorption of vitamins A and D, immune functioning, stress response, and the transport of fats in the bloodstream.
Megalin is embedded in the membrane of cells that line the surfaces and cavities of the body (epithelial cells). The receptor helps move its ligands from the cell surface into the cell (endocytosis), and is also involved in transporting the ligands of a related receptor called cubulin. Megalin is active in the development and function of many parts of the body, including the brain and spinal cord (central nervous system), eyes, ears, lungs, intestine, reproductive system, and the small tubes in the kidneys where urine is formed (renal tubules).
At least twelve LRP2 gene mutations have been identified in people with Donnai-Barrow syndrome. These mutations are believed to result in the absence of functional megalin protein. The lack of functional megalin in the renal tubules causes megalin's various ligands to be excreted in the urine rather than being absorbed back into the bloodstream. The features of Donnai-Barrow syndrome are probably caused by the inability of megalin to help absorb these ligands, disruption of biochemical signaling pathways, or other effects of the nonfunctional megalin protein. However, it is unclear how these abnormalities result in the specific signs and symptoms of the disorder.
A condition previously classified as a separate disorder called facio-oculo-acoustico-renal (FOAR) syndrome has also been found to be caused by LRP2 gene mutations. FOAR syndrome is now considered to be the same disorder as Donnai-Barrow syndrome.
Certain common genetic variations (polymorphisms) in the LRP2 gene may be associated with differences in the progression, recurrence, and severity of prostate cancer in affected men. Androgens, which are male sex hormones that contribute to the growth of cancerous (malignant) prostate tumors, are among megalin's ligands. A recent study suggests that prostate tumor cells may produce increased amounts of megalin and thereby absorb more androgens. LRP2 gene polymorphisms that increase the activity of megalin may encourage more aggressive tumor growth, while polymorphisms that decrease the activity of megalin may tend to slow tumor growth.
Certain LRP2 gene polymorphisms have also been associated with increased levels of low-density lipoproteins (LDLs) and cholesterol in the blood. LDLs are the primary carriers of cholesterol in the blood. Cholesterol is a waxy, fat-like substance that is produced in the body and obtained from foods that come from animals. Increased LDL levels may result in excess cholesterol circulating through the bloodstream and accumulating on the walls of the blood vessels, increasing a person's risk of cardiovascular disease.
LDLs are among megalin's ligands, and researchers believe that variations in megalin function resulting from LRP2 gene changes may influence LDL levels.
Cytogenetic Location: 2q24-q31
Molecular Location on chromosome 2: base pairs 169,983,618 to 170,219,121
The LRP2 gene is located on the long (q) arm of chromosome 2 between positions 24 and 31.
More precisely, the LRP2 gene is located from base pair 169,983,618 to base pair 170,219,121 on chromosome 2.
See How do geneticists indicate the location of a gene? (http://ghr.nlm.nih.gov/handbook/howgeneswork/genelocation) in the Handbook.
You and your healthcare professional may find the following resources about LRP2 helpful.
You may also be interested in these resources, which are designed for genetics professionals and researchers.
See How are genetic conditions and genes named? (http://ghr.nlm.nih.gov/handbook/mutationsanddisorders/naming) in the Handbook.
androgens ; calcium ; cancer ; cardiovascular ; cell ; central nervous system ; cholesterol ; endocytosis ; epithelial ; gene ; intestine ; LDL ; lipoprotein ; low-density lipoproteins ; nephritis ; nervous system ; progression ; prostate ; protein ; receptor ; renal ; stress ; syndrome ; tumor ; vitamins
You may find definitions for these and many other terms in the Genetics Home Reference Glossary (http://www.ghr.nlm.nih.gov/glossary).
The resources on this site should not be used as a substitute for professional medical care or advice. Users seeking information about a personal genetic disease, syndrome, or condition should consult with a qualified healthcare professional. See How can I find a genetics professional in my area? (http://ghr.nlm.nih.gov/handbook/consult/findingprofessional) in the Handbook.