Normal nuclear lamina (a and b) and mutant nuclear lamina (c and d) from a patient with HGPS, visualized by immunofluorescence - note the irregular and bumpy shape of the laminopathic nuclei[1]
Laminopathies (lamino- + -pathy) are a group of rare genetic disorders caused by mutations in genes encoding proteins of the nuclear lamina. Since the first reports of laminopathies in the late 1990s, increased research efforts have started to uncover the vital role of nuclear envelope proteins in cell and tissue integrity in animals. Laminopathies are a group of degenerative diseases, other disorders associated with inner nuclear membrane proteins are known as nuclear envelopathies.[2]
Symptoms and signs
Laminopathies and other nuclear envelopathies have a large variety of clinical symptoms including skeletal and/or cardiac muscular dystrophy, lipodystrophy and diabetes, dysplasia, dermo- or neuropathy, leukodystrophy, and progeria (premature aging). Most of these symptoms develop after birth, typically during childhood or adolescence. Some laminopathies however may lead to an early death, and mutations of lamin B1 (LMNB1 gene) may be lethal before or at birth.[3]
Genetics
Patients with classical laminopathy have mutations in the gene coding for lamin A/C (LMNA gene).[citation needed]
Mutations in the gene coding for lamin B2 (LMNB2 gene) have been linked to Barraquer-Simons syndrome[4] and duplication in the gene coding for lamin B1 (LMNB1 gene) cause autosomal dominant leukodystrophy.[5]
Mutations causing laminopathies include recessive as well as dominantalleles with rare de novo mutations creating dominant alleles that do not allow their carriers to reproduce before death.[citation needed]
The nuclear envelopathy with the highest frequency in human populations is Emery–Dreifuss muscular dystrophy caused by an X-linked mutation in the EMD gene coding for emerin and affecting an estimated 1 in 100,000 people.[citation needed]
Molecular mechanism
Lamins are intermediate filament proteins that form the nuclear lamina scaffold underneath the nuclear envelope in animal cells. They are attached to the nuclear envelope membrane via farnesyl anchors and interaction with inner nuclear membrane proteins such as lamin B receptor and emerin. The nuclear lamina appears to be an adaptation to mobility in animals as sessile organisms such as plants or fungi do not have lamins[11] and the symptoms of many laminopathies include muscle defects. Mutations in these genes might lead to defects in filament assembly and/or attachment to the nuclear envelope and thus jeopardize nuclear envelope stability in physically stressed tissues such as muscle fibers, bone, skin and connective tissue.[12]
Messenger RNA produced from the LMNA gene undergoes alternative splicing and is translated into lamins A and C. Lamin A undergoes farnesylation to attach a membrane anchor to the protein. This version of the protein is also referred to as prelamin A. Farnesylated prelamin A is further processed into mature lamin A by a metalloproteinase removing the last 15 amino acids and its farnesylated cysteine. This allows lamin A to dissociate from the nuclear envelope membrane and fulfill nuclear functions. Mutations causing laminopathies interfere with these processes on different levels.[citation needed]
Nonsense and missense mutations
Missense mutations in the lamin A/C rod and tail domains are the cause for a wide array of genetic disorders, suggesting that lamin A/C protein contains distinct functional domains that are essential for the maintenance and integrity of different cell lineages. Interaction between lamin A and the nuclear envelope protein emerin appears to be crucial in muscle cells, with certain mutations in lamin mimicking mutations in emerin and causing Emery–Dreifuss muscular dystrophy. Different mutations lead to dominant-negative and recessive alleles. Mutations in the lamin rod domain leading to mislocalization of both lamin A and emerin occur in patients with autosomal dominant forms of muscular dystrophy and cardiomyopathy.[citation needed]
Most lamin B mutations appear to be lethal with mutations in lamin B1 causing death at birth in mice.[3] In 2006, lamin B2 missense mutations were identified in patients with acquired partial lipodystrophy.[13]
Point mutations
The most common mutation in the lamin A/C is the homozygous Arg527His (arginine replaced by histidine at position 527) substitution in
exon 9 of the LMNA gene[14]
Other known mutations are Ala529Val and Arg527His/Val440Met.[15] Additionally, some mutations such as Arg527Cys, Lys542Asn, Arg471Cys, Thr528Met/Met540Thr, and Arg471Cys/Arg527Cys, Arg527Leu
result in mandibuloacral dysplasia with progeria-like features.[16]
Splicing defects
Mutations causing progeria are defective in splicing LMNA mRNA, therefore producing abnormal lamin A protein, also known as progerin. The mutations activate a cryptic splice site within exon 11 of the gene, thereby causing the deletion of the processing site on prelamin A.[17] This results in an accumulation of progerin that is unable to mature into lamin A, leading to misshapen nuclei. Missplicing also leads to the complete or partial loss of exon 11 and results in a truncated prelamin A protein in the neonatal lethal tight skin contracture syndrome.[18]
Processing defects
Since the metalloproteinase STE24 is required to process prelamin A into mature lamin A, mutations in this gene abolishing protease activity cause defects similar to laminopathies caused by prelamin A with truncated processing sites. Symptoms in patients with ZMPSTE24 mutation range from mandibuloacral dysplasia, progeroid appearance, and generalized lipodystrophy to infant-lethal restrictive dermopathy.[citation needed]
Gene dosage effects
In the case of autosomal dominant leukodystrophy, the disease is associated with a duplication of the lamin B gene LMNB1. The exact dosage of lamin B in cells appears to be crucial for nuclear integrity as increased expression of lamin B causes a degenerative phenotype in fruit flies and leads to abnormal nuclear morphology.[19]
Autoimmune antibodies
Antibodies against lamins are detected in the sera of some individuals with autoimmune diseases.[20]
DNA repair
A-type lamins promote genetic stability by maintaining the levels of proteins that have key roles in DNA double-strand break repair during the processes of non-homologous end joining and homologous recombination.[21] Mutations in lamin A (LMNA) cause Hutchinson–Gilford progeria syndrome, a dramatic form of premature aging.[17] Mouse cells deficient for maturation of prelamin A show increased DNA damage and chromosome aberrations and are more sensitive to DNA damaging agents.[22] The inability to adequately repair DNA damages when A-type lamins are defective is likely responsible for some of the aspects of premature aging.[citation needed]
Diagnosis
Types of known laminopathies and other nuclear envelopathies
The recent progress in uncovering the molecular mechanisms of toxic progerin formation in laminopathies leading to premature aging has opened up the potential for the development of targeted treatment. The farnesylation of prelamin A and its pathological form progerin is carried out by the enzyme farnesyl transferase. Farnesyl transferase inhibitors (FTIs) can be used effectively to reduce symptoms in two mouse model systems for progeria and to revert the abnormal nuclear morphology in progeroid cell cultures. Two oral FTIs, lonafarnib and tipifarnib, are already in use as anti-tumor medication in humans and may become avenues of treatment for children with laminopathic progeria. Nitrogen-containing bisphosphate drugs used in the treatment of osteoporosis reduce farnesyldiphosphate production and thus prelamin A farnesylation. Testing of these drugs may prove them to be useful in treating progeria as well. The use of antisenseoligonucleotides to inhibit progerin synthesis in affected cells is another avenue of current research into the development of anti-progerin drugs.[41][42]
^Zirn B, Kress W, Grimm T, Berthold LD, et al. (2008). "Association of homozygous LMNA mutation R471C with new phenotype: mandibuloacral dysplasia, progeria, and rigid spine muscular dystrophy". Am J Med Genet A. 146A (8): 1049–1054. doi:10.1002/ajmg.a.32259. PMID18348272. S2CID205309256.
^Charniot JC, Pascal C, Bouchier C, Sebillon P, Salama J, Duboscq-Bidot L, Peuchmaurd M, Desnos M, Artigou JY, Komajda M (2003). "Functional consequences of an LMNA mutation associated with a new cardiac and non-cardiac phenotype". Hum. Mutat. 21 (5): 473–81. doi:10.1002/humu.10170. PMID12673789. S2CID32614095.
^Caux F, Dubosclard E, Lascols O, Buendia B, Chazouilleres O, Cohen A, Courvalin JC, Laroche L, Capeau J, Vigouroux C, Christin-Maitre S (2003). "A new clinical condition linked to a novel mutation in lamins A and C with generalized lipoatrophy, insulin-resistant diabetes, disseminated leukomelanodermic papules, liver steatosis, and cardiomyopathy". J. Clin. Endocrinol. Metab. 88 (3): 1006–13. doi:10.1210/jc.2002-021506. PMID12629077.
^Hoffmann K, Dreger CK, Olins AL, Olins DE, Shultz LD, Lucke B, Karl H, Kaps R, Muller D, Vaya A, Aznar J, Ware RE, Cruz NS, Lindner TH, Herrmann H, Reis A, Sperling K (2002). "Mutations in the gene encoding the lamin B receptor produce an altered nuclear morphology in granulocytes (Pelger-Huet anomaly)". Nature Genetics. 31 (4): 410–4. doi:10.1038/ng925. PMID12118250. S2CID6020153.
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