lamin A/C
Dernière mise à jour 19 nov. 2025
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La LMNA gene provides instructions for making several slightly different proteins called lamins. The two major proteins produced from this gene, lamin A and lamin C, are made in most of the body's cells. These proteins are made up of a nearly identical sequence of protein building blocks (amino acids). The small difference in the sequence makes lamin A longer than lamin C.
Normal function
La LMNA gene provides instructions for making several slightly different proteins called lamins. The two major proteins produced from this gene, lamin A and lamin C, are made in most of the body's cells. These proteins are made up of a nearly identical sequence of protein building blocks (amino acids). The small difference in the sequence makes lamin A longer than lamin C.
Lamins A and C are structural proteins called intermediate filament proteins. Intermediate filaments provide stability and strength to cells. Lamins A and C are supporting (scaffolding) components of the nuclear envelope, which is a structure that surrounds the nucleus in cells. Specifically, these proteins are located in the nuclear lamina, a mesh-like layer of intermediate filaments and other proteins that is attached to the inner membrane of the nuclear envelope. The nuclear envelope regulates the movement of molecules into and out of the nucleus. Lamins A and C are also found inside the nucleus, and researchers believe the proteins may play a role in regulating the activity (expression) of certain genes.
The lamin A protein must be processed within the cell before becoming part of the lamina. Its initial form, called prelamin A, undergoes a complex series of steps that are necessary for the protein to be inserted into the lamina. Lamin C does not have to undergo this processing before becoming part of the lamina.
Conditions referring to this gene or chromosome
Other names
LMN1
LMNA_HUMAN
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Lectures complémentaires et références
- lamin A/C; MedlinePlus, National Library of Medicine.
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- Bonne G, Quijano-Roy S. Emery-Dreifuss muscular dystrophy, laminopathies, and other nuclear envelopathies. Handb Clin Neurol. 2013;113:1367-76. doi: 10.1016/B978-0-444-59565-2.00007-1.
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- Muchir A, Bonne G, van der Kooi AJ, van Meegen M, Baas F, Bolhuis PA, de Visser M, Schwartz K. Identification of mutations in the gene encoding lamins A/C in autosomal dominant limb girdle muscular dystrophy with atrioventricular conduction disturbances (LGMD1B). Hum Mol Genet. 2000 May 22;9(9):1453-9. doi: 10.1093/hmg/9.9.1453.
- Navarro CL, De Sandre-Giovannoli A, Bernard R, Boccaccio I, Boyer A, Genevieve D, Hadj-Rabia S, Gaudy-Marqueste C, Smitt HS, Vabres P, Faivre L, Verloes A, Van Essen T, Flori E, Hennekam R, Beemer FA, Laurent N, Le Merrer M, Cau P, Levy N. Lamin A and ZMPSTE24 (FACE-1) defects cause nuclear disorganization and identify restrictive dermopathy as a lethal neonatal laminopathy. Hum Mol Genet. 2004 Oct 15;13(20):2493-503. doi: 10.1093/hmg/ddh265. Epub 2004 Aug 18.
- Novelli G, Muchir A, Sangiuolo F, Helbling-Leclerc A, D'Apice MR, Massart C, Capon F, Sbraccia P, Federici M, Lauro R, Tudisco C, Pallotta R, Scarano G, Dallapiccola B, Merlini L, Bonne G. Mandibuloacral dysplasia is caused by a mutation in LMNA-encoding lamin A/C. Am J Hum Genet. 2002 Aug;71(2):426-31. doi: 10.1086/341908. Epub 2002 Jun 19.
- Petillo R, D'Ambrosio P, Torella A, Taglia A, Picillo E, Testori A, Ergoli M, Nigro G, Piluso G, Nigro V, Politano L. Novel mutations in LMNA A/C gene and associated phenotypes. Acta Myol. 2015 Dec;34(2-3):116-9.
- Quijano-Roy S, Mbieleu B, Bonnemann CG, Jeannet PY, Colomer J, Clarke NF, Cuisset JM, Roper H, De Meirleir L, D'Amico A, Ben Yaou R, Nascimento A, Barois A, Demay L, Bertini E, Ferreiro A, Sewry CA, Romero NB, Ryan M, Muntoni F, Guicheney P, Richard P, Bonne G, Estournet B. De novo LMNA mutations cause a new form of congenital muscular dystrophy. Ann Neurol. 2008 Aug;64(2):177-86. doi: 10.1002/ana.21417.
- Sinkovec M, Petrovic D, Volk M, Peterlin B. Familial progressive sinoatrial and atrioventricular conduction disease of adult onset with sudden death, dilated cardiomyopathy, and brachydactyly. A new type of heart-hand syndrome? Clin Genet. 2005 Aug;68(2):155-60. doi: 10.1111/j.1399-0004.2005.00476.x.
- Varlet AA, Helfer E, Badens C. Molecular and Mechanobiological Pathways Related to the Physiopathology of FPLD2. Cells. 2020 Aug 23;9(9):1947. doi: 10.3390/cells9091947.
- Vigouroux C, Guenantin AC, Vatier C, Capel E, Le Dour C, Afonso P, Bidault G, Bereziat V, Lascols O, Capeau J, Briand N, Jeru I. Lipodystrophic syndromes due to LMNA mutations: recent developments on biomolecular aspects, pathophysiological hypotheses and therapeutic perspectives. Nucleus. 2018 Jan 1;9(1):235-248. doi: 10.1080/19491034.2018.1456217.
- Zaragoza MV, Hakim SA, Hoang V, Elliott AM. Heart-hand syndrome IV: a second family with LMNA-related cardiomyopathy and brachydactyly. Clin Genet. 2017 Mar;91(3):499-500. doi: 10.1111/cge.12870. Epub 2016 Oct 10.
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