Reviewed September 2010
What is the official name of the GRN gene?
The official name of this gene is “granulin.”
GRN is the gene's official symbol. The GRN gene is also known by other names, listed below.
What is the normal function of the GRN gene?
The GRN gene provides instructions for making a protein called granulin (also known as progranulin). This protein is found in tissues throughout the body. It is most active in cells that are dividing rapidly, such as skin cells and cells that line the gastrointestinal tract. Granulin helps regulate the growth, division, and survival of these cells. It also plays important roles in early embryonic development, regulation of the body's immune system response, and wound healing.
Granulin is active in several types of brain cells, although much less is known about this protein's function in the brain. It appears to be critical for the survival of nerve cells (neurons).
How are changes in the GRN gene related to health conditions?
- GRN-related frontotemporal dementia - associated with the GRN gene
More than 65 mutations in the GRN gene have been identified in people with GRN-related frontotemporal dementia. The most common mutation, which is written as Arg493Ter or R493X, creates a premature stop signal in the instructions for making granulin. Most of the mutations that cause GRN-related frontotemporal dementia prevent any protein from being produced from one copy of the GRN gene in each cell. As a result of these genetic changes, cells make only half the usual amount of granulin.
It is unclear how a shortage of granulin leads to the features of GRN-related frontotemporal dementia. However, studies have shown that the disorder is characterized by the buildup of a protein called TAR DNA-binding protein (TDP-43) in certain brain cells. The TDP-43 protein forms clumps (aggregates) that may interfere with cell functions and ultimately lead to cell death. Researchers are working to determine how mutations in the GRN gene, and the resulting loss of granulin, are related to a buildup of TDP-43 in the brain.
The features of GRN-related frontotemporal dementia result from the gradual loss of neurons in regions near the front of the brain called the frontal and temporal lobes. The frontal lobes are involved in reasoning, planning, judgment, and problem-solving, while the temporal lobes help process hearing, speech, memory, and emotion. The death of neurons in these areas causes problems with many critical brain functions. However, it is unclear why the loss of neurons occurs in the frontal and temporal lobes more often than other brain regions in people with GRN-related frontotemporal dementia.
Where is the GRN gene located?
Cytogenetic Location: 17q21.32
Molecular Location on chromosome 17: base pairs 42,422,490 to 42,430,469
The GRN gene is located on the long (q) arm of chromosome 17 at position 21.32.
More precisely, the GRN gene is located from base pair 42,422,490 to base pair 42,430,469 on chromosome 17.
See How do geneticists indicate the location of a gene? (http://ghr.nlm.nih.gov/handbook/howgeneswork/genelocation) in the Handbook.
Where can I find additional information about GRN?
You and your healthcare professional may find the following resources about GRN helpful.
You may also be interested in these resources, which are designed for genetics professionals and researchers.
- PubMed - Recent literature (http://www.ncbi.nlm.nih.gov/pubmed?term=((GRN%5BTIAB%5D)%20OR%20(granulin%5BTIAB%5D)%20OR%20(PGRN%5BTIAB%5D)%20OR%20(progranulin%5BTIAB%5D))%20AND%20((Genes%5BMH%5D)%20OR%20(Genetic%20Phenomena%5BMH%5D))%20AND%20english%5Bla%5D%20AND%20human%5Bmh%5D%20AND%20%22last%201800%20days%22%5Bdp%5D)
- OMIM - Genetic disorder catalog (http://omim.org/entry/138945)
Research Resources - Tools for researchers
- Alzheimer Disease & Frontotemporal Dementia Mutation Database (http://www.molgen.ua.ac.be/FTDMutations/Default.cfm?MT=1&ML=0&Page=Contexts&ID=5)
- Atlas of Genetics and Cytogenetics in Oncology and Haematology (http://atlasgeneticsoncology.org/Genes/GC_GRN.html)
- Entrez Gene (http://www.ncbi.nlm.nih.gov/gene/2896)
- GeneCards (http://www.genecards.org/cgi-bin/carddisp.pl?id_type=entrezgene&id=2896)
- HUGO Gene Nomenclature Committee (http://www.genenames.org/data/hgnc_data.php?hgnc_id=4601)
What other names do people use for the GRN gene or gene products?
- granulins precursor
- PC cell-derived growth factor
See How are genetic conditions and genes named? (http://ghr.nlm.nih.gov/handbook/mutationsanddisorders/naming) in the Handbook.
What glossary definitions help with understanding GRN?
growth factor ;
immune system ;
You may find definitions for these and many other terms in the Genetics Home Reference
- Baker M, Mackenzie IR, Pickering-Brown SM, Gass J, Rademakers R, Lindholm C, Snowden J, Adamson J, Sadovnick AD, Rollinson S, Cannon A, Dwosh E, Neary D, Melquist S, Richardson A, Dickson D, Berger Z, Eriksen J, Robinson T, Zehr C, Dickey CA, Crook R, McGowan E, Mann D, Boeve B, Feldman H, Hutton M. Mutations in progranulin cause tau-negative frontotemporal dementia linked to chromosome 17. Nature. 2006 Aug 24;442(7105):916-9. Epub 2006 Jul 16. (http://www.ncbi.nlm.nih.gov/pubmed/16862116?dopt=Abstract)
- Bateman A, Bennett HP. The granulin gene family: from cancer to dementia. Bioessays. 2009 Nov;31(11):1245-54. doi: 10.1002/bies.200900086. Review. (http://www.ncbi.nlm.nih.gov/pubmed/19795409?dopt=Abstract)
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- Cruts M, Van Broeckhoven C. Loss of progranulin function in frontotemporal lobar degeneration. Trends Genet. 2008 Apr;24(4):186-94. doi: 10.1016/j.tig.2008.01.004. Epub 2008 Mar 6. Review. (http://www.ncbi.nlm.nih.gov/pubmed/18328591?dopt=Abstract)
- Entrez Gene (http://www.ncbi.nlm.nih.gov/gene/2896)
- Eriksen JL, Mackenzie IR. Progranulin: normal function and role in neurodegeneration. J Neurochem. 2008 Jan;104(2):287-97. Epub 2007 Oct 22. Review. (http://www.ncbi.nlm.nih.gov/pubmed/17953663?dopt=Abstract)
- Gass J, Cannon A, Mackenzie IR, Boeve B, Baker M, Adamson J, Crook R, Melquist S, Kuntz K, Petersen R, Josephs K, Pickering-Brown SM, Graff-Radford N, Uitti R, Dickson D, Wszolek Z, Gonzalez J, Beach TG, Bigio E, Johnson N, Weintraub S, Mesulam M, White CL 3rd, Woodruff B, Caselli R, Hsiung GY, Feldman H, Knopman D, Hutton M, Rademakers R. Mutations in progranulin are a major cause of ubiquitin-positive frontotemporal lobar degeneration. Hum Mol Genet. 2006 Oct 15;15(20):2988-3001. Epub 2006 Sep 1. (http://www.ncbi.nlm.nih.gov/pubmed/16950801?dopt=Abstract)
- Le Ber I, van der Zee J, Hannequin D, Gijselinck I, Campion D, Puel M, Laquerrière A, De Pooter T, Camuzat A, Van den Broeck M, Dubois B, Sellal F, Lacomblez L, Vercelletto M, Thomas-Antérion C, Michel BF, Golfier V, Didic M, Salachas F, Duyckaerts C, Cruts M, Verpillat P, Van Broeckhoven C, Brice A; French Research Network on FTD/FTD-MND. Progranulin null mutations in both sporadic and familial frontotemporal dementia. Hum Mutat. 2007 Sep;28(9):846-55. (http://www.ncbi.nlm.nih.gov/pubmed/17436289?dopt=Abstract)
- Rademakers R, Baker M, Gass J, Adamson J, Huey ED, Momeni P, Spina S, Coppola G, Karydas AM, Stewart H, Johnson N, Hsiung GY, Kelley B, Kuntz K, Steinbart E, Wood EM, Yu CE, Josephs K, Sorenson E, Womack KB, Weintraub S, Pickering-Brown SM, Schofield PR, Brooks WS, Van Deerlin VM, Snowden J, Clark CM, Kertesz A, Boylan K, Ghetti B, Neary D, Schellenberg GD, Beach TG, Mesulam M, Mann D, Grafman J, Mackenzie IR, Feldman H, Bird T, Petersen R, Knopman D, Boeve B, Geschwind DH, Miller B, Wszolek Z, Lippa C, Bigio EH, Dickson D, Graff-Radford N, Hutton M. Phenotypic variability associated with progranulin haploinsufficiency in patients with the common 1477C-->T (Arg493X) mutation: an international initiative. Lancet Neurol. 2007 Oct;6(10):857-68. Erratum in: Lancet Neurol. 2007 Dec;6(12):1037. (http://www.ncbi.nlm.nih.gov/pubmed/17826340?dopt=Abstract)
- Yu CE, Bird TD, Bekris LM, Montine TJ, Leverenz JB, Steinbart E, Galloway NM, Feldman H, Woltjer R, Miller CA, Wood EM, Grossman M, McCluskey L, Clark CM, Neumann M, Danek A, Galasko DR, Arnold SE, Chen-Plotkin A, Karydas A, Miller BL, Trojanowski JQ, Lee VM, Schellenberg GD, Van Deerlin VM. The spectrum of mutations in progranulin: a collaborative study screening 545 cases of neurodegeneration. Arch Neurol. 2010 Feb;67(2):161-70. doi: 10.1001/archneurol.2009.328. (http://www.ncbi.nlm.nih.gov/pubmed/20142524?dopt=Abstract)
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
See How can I find a genetics professional in my area? (http://ghr.nlm.nih.gov/handbook/consult/findingprofessional) in the Handbook.