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Reviewed February 2012
What is the official name of the LBR gene?
The official name of this gene is “lamin B receptor.”
LBR is the gene's official symbol. The LBR gene is also known by other names, listed below.
Read more about gene names and symbols on the About page.
What is the normal function of the LBR gene?
The LBR gene provides instructions for making a protein called the lamin B receptor. Different regions (domains) of this protein give it two distinct functions.
One region of the protein, called the sterol reductase domain, gives the protein sterol reductase function (specifically Δ14-sterol reductase function). This function of the lamin B receptor plays an important role in the production (synthesis) of cholesterol. Cholesterol is a lipid (fat) that is obtained from foods that come from animals: eggs, meat, fish, and dairy products. The body also makes (synthesizes) its own cholesterol. During cholesterol synthesis, the sterol reductase function of the lamin B receptor allows the protein to perform one of several chemical reactions that convert a molecule called lanosterol to cholesterol.
The body needs cholesterol to develop and function normally. Before birth, cholesterol interacts with signaling proteins that control early development of the brain, limbs, genitals, and other structures. It is also an important component of cell membranes and myelin, the fatty covering that insulates nerve cells. Additionally, cholesterol is used to make certain hormones and is important for the production of acids used in digestion (bile acids).
Another region of the lamin B receptor, called the DNA-binding domain, attaches (binds) to chromatin, the complex of DNA and proteins that packages DNA into chromosomes. The lamin B receptor can be found in the membrane that surrounds the nucleus (the nuclear envelope). The protein's interaction with chromatin attaches it to the nuclear envelope and helps maintain the chromatin's structure. Proper interaction of chromatin with the nuclear envelope may play a role in several important cellular functions such as making new copies of DNA (replication), controlling the activity of genes, and regulating programmed cell death (apoptosis). The DNA-binding domain of the protein also plays a role in the formation of the nucleus within cells.
How are changes in the LBR gene related to health conditions?
Where is the LBR gene located?
Cytogenetic Location: 1q42.1
Molecular Location on chromosome 1: base pairs 225,401,502 to 225,428,855
The LBR gene is located on the long (q) arm of chromosome 1 at position 42.1.
More precisely, the LBR gene is located from base pair 225,401,502 to base pair 225,428,855 on chromosome 1.
See How do geneticists indicate the location of a gene? in the Handbook.
Where can I find additional information about LBR?
You and your healthcare professional may find the following resources about LBR helpful.
You may also be interested in these resources, which are designed for genetics professionals and researchers.
What other names do people use for the LBR gene or gene products?
See How are genetic conditions and genes named? in the Handbook.
Where can I find general information about genes?
The Handbook provides basic information about genetics in clear language.
These links provide additional genetics resources that may be useful.
What glossary definitions help with understanding LBR?
acids ; apoptosis ; bile ; bone formation ; cell ; cholesterol ; chromatin ; digestion ; DNA ; domain ; dysplasia ; gene ; genitals ; lamin ; lipid ; molecule ; nuclear envelope ; nucleus ; protein ; receptor ; synthesis ; toxic
You may find definitions for these and many other terms in the Genetics Home Reference Glossary.
See also Understanding Medical Terminology.
References (9 links)
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? in the Handbook.