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  • Results 1 to 9 of 9

    Thread: Androgen receptor gene, cool read

    1. #1
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      Androgen receptor gene, cool read

      What is the official name of the AR gene?

      The official name of this gene is ?androgen receptor.?
      AR is the gene's official symbol. The AR gene is also known by other names, listed below.
      Read more about why gene symbols are italicized on the About page.

      What is the normal function of the AR gene?

      The AR gene provides instructions for making a protein called an androgen receptor. Androgens are hormones (such as testosterone) that are important for normal male sexual development before birth and during puberty. Androgen receptors allow the body to respond appropriately to these hormones. The receptors are present in many of the body's tissues, where they attach (bind) to androgens. The resulting androgen-receptor complex then binds to DNA and regulates the activity of androgen-responsive genes. By turning the genes on or off as necessary, the androgen receptor helps direct the development of male sexual characteristics. Androgens and androgen receptors also have other important functions in both males and females, such as regulating hair growth and sex drive.
      In one region of the AR gene, a DNA segment known as CAG is repeated multiple times. This CAG segment is called a triplet or trinucleotide repeat. In most people, the number of CAG repeats in the AR gene ranges from fewer than 10 to about 36.


      How are changes in the AR gene related to health conditions?

      androgen insensitivity syndrome - caused by mutations in the AR gene More than 600 different mutations in the AR gene have been identified in people with androgen insensitivity syndrome. Most of these mutations are changes in single DNA building blocks (base pairs). Other mutations insert or delete multiple base pairs in the gene or affect how the gene is processed into a protein. Some changes in the AR gene lead to an abnormally short version of the androgen receptor protein; others result in the production of an abnormal receptor that cannot bind to androgens or to DNA. As a result, cells that are sensitive to androgens become less responsive to these hormones or unable to use these hormones at all.
      Mutations that completely eliminate the function of the androgen receptor cause complete androgen insensitivity syndrome. Genetic changes that significantly reduce but do not eliminate the receptor's activity cause partial androgen insensitivity syndrome. Mild androgen insensitivity syndrome results from changes that only slightly reduce the activity of the receptor.
      spinal and bulbar muscular atrophy - caused by mutations in the AR gene Spinal and bulbar muscular atrophy results from an expansion of the CAG trinucleotide repeat in the AR gene. In people with this disorder, CAG is abnormally repeated from 38 to more than 60 times. Although the extended CAG region changes the structure of the androgen receptor, it is unclear how the altered protein disrupts nerve cells. Researchers believe that a fragment of the androgen receptor protein containing the CAG repeats accumulates within these cells and interferes with normal cell functions. This buildup leads to the gradual loss of nerve cells in the brain and spinal cord that control muscle movement.
      androgenetic alopecia - associated with the AR gene Alterations in the AR gene are associated with an increased risk of androgenetic alopecia (also known as male-pattern baldness in men and female-pattern baldness in women). The variations result from small changes in the number or types of DNA building blocks (base pairs) that make up the AR gene. These genetic changes appear to be most frequent in men with hair loss that begins at an early age. Researchers believe that AR gene variations may increase the activity of androgen receptors in the scalp. Although androgenetic alopecia is related to the effects of androgens on hair growth, it remains unclear how changes in the AR gene increase the risk of patterned hair loss in men and women with this condition.
      breast cancer - associated with the AR gene Researchers have considered a possible relationship between the length of the CAG repeat region in the AR gene and a woman's chance of developing breast cancer. The results of research studies have been mixed. Some studies have suggested that a long CAG repeat region is associated with an increased risk of breast cancer in women, and that a shorter CAG repeat region is associated with a reduced risk. Other research indicates that a shorter CAG repeat region may be related to an increased risk of both breast cancer and noncancerous (benign) breast disease. Shorter CAG repeat regions have also been associated with more aggressive forms of breast cancer. Additional research is needed to clarify what role, if any, this region of the AR gene plays in determining breast cancer risk.
      other cancers - associated with the AR gene At least 85 mutations in the AR gene have been associated with prostate cancer. Almost all of these mutations are somatic, which means they develop during a person's life and occur only in certain cells (in this case, cells in the prostate). Somatic mutations are not inherited and are not passed to future generations.
      Some studies have shown an increased risk of prostate cancer in men with a short CAG repeat region in the AR gene; however, other studies did not find this connection. Researchers also believe that extra copies of the gene in cancer cells may be associated with the progression of prostate cancers.
      Recent studies have also suggested that a longer CAG repeat region in the AR gene may increase the risk of endometrial cancer in women.


      Where is the AR gene located?

      Cytogenetic Location: Xq12
      Molecular Location on the X chromosome: base pairs 66,763,873 to 66,944,118

      The AR gene is located on the long (q) arm of the X chromosome at position 12.
      More precisely, the AR gene is located from base pair 66,763,873 to base pair 66,944,118 on the X chromosome.
      See How do geneticists indicate the location of a gene? in the Handbook.

      Where can I find additional information about AR?

      You and your healthcare professional may find the following resources about AR helpful.
      You may also be interested in these resources, which are designed for genetics professionals and researchers.
      • <LI class=sourcelink>PubMed - Recent literature <LI class=sourcelink>OMIM - Genetic disorder catalog
      • Research Resources - Tools for researchers (6 links)

      What other names do people use for the AR gene or gene products?

      • AIS
      • ANDR_HUMAN
      • androgen receptor (dihydrotestosterone receptor; testicular feminization; spinal and bulbar muscular atrophy; Kennedy disease)
      • DHTR
      • HUMARA
      • KD
      • NR3C4
      • SBMA
      • SMAX1
      • TFM

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      Took a bit to get through all the links, but well worth the time.

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      well that was a very good read. i have androgen insenitivity syndrome to deca. i think this should be a STICKIE. as its very, very informative as my base pairs are messed up. i thought that was taboo but its in black and white. good read for vetreans.
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      good read thanks

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      Couple interesting tidbits about AR's. They dont downregulate. Androgens are always attaching to new receptors. Standard life span ffor an AR is about 3 hrs. In the presence of excess androgens that lifespan almost doubles to around 6 hrs (ie - on cycle or even trt). Also in the presence of excess androgens the rate of production for new AR's almost doubles as well. There are limiting factors to growth and so on but androgen receptor saturation or down-regulation are not among those factors.

      J Biol Chem. 1985 Jan 10;260(1):455-61.
      Mechanism of androgen-receptor augmentation. Analysis of receptor synthesis and degradation by the density-shift technique.
      Syms AJ, Norris JS, Panko WB, Smith RG.
      The ductus deferens smooth muscle tumor cell line (DDT1MF-2) contains receptors for, and is stimulated by, androgens. Cells cultured in the absence of androgens maintain a basal level of androgen receptors. Following incubation with various concentrations of the synthetic androgen methyltrienolone (R1881) for 1-6 h, the concentration of these receptors increased from 6.0 to 12.2 fmol/micrograms of DNA, while the equilibrium dissociation constant (Kd) of 0.5 nM for this steroid remained unchanged. The steroid-induced increase in androgen receptor levels was specific for androgens and dependent upon protein synthesis. The mechanism of receptor augmentation was examined by utilization of isotopically dense amino acids to determine rates of receptor appearance and degradation in the presence or absence of [3H]R1881. In the absence of androgens, the half-life of the androgen receptor was 3.1 h, with a rate constant (kD) of 0.22/h. In the presence of 1 nM [3H]R1881, however, the half-life was 6.6 h, with kD = 0.11/h. The rate constant for receptor synthesis (ks) in the absence or presence of [3H]R1881 was calculated to be 1.35 and 2.23 fmol/micrograms of DNA/h, respectively. Thus, androgen-induced androgen-receptor augmentation is explained by an increase both in receptor half-life and in rates of receptor synthesis.

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      Awesome read thank you!

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      Great info here!

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      Quote Originally Posted by unclem View Post
      well that was a very good read. i have androgen insenitivity syndrome to deca. i think this should be a STICKIE. as its very, very informative as my base pairs are messed up. i thought that was taboo but its in black and white. good read for vetreans.
      How did you determine this? From not responding well to Deca?

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      Wow.. great info!

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