- Research article
- Open Access
- Open Peer Review
Molecular diagnosis of hereditary inclusion body myopathy by linkage analysis and identification of a novel splice site mutation in GNE
- Steven E Boyden†1, 2,
- Anna R Duncan†1,
- Elicia A Estrella1,
- Hart GW Lidov1, 3, 4,
- Lane J Mahoney1,
- Jonathan S Katz5,
- Louis M Kunkel1, 2, 6 and
- Peter B Kang1, 7, 8Email author
© Boyden et al; licensee BioMed Central Ltd. 2011
- Received: 23 December 2010
- Accepted: 28 June 2011
- Published: 28 June 2011
Many myopathies share clinical features in common, and diagnosis often requires genetic testing. We ascertained a family in which five siblings presented with distal muscle weakness of unknown etiology.
We performed high-density genomewide linkage analysis and mutation screening of candidate genes to identify the genetic defect in the family. Preserved clinical biopsy material was reviewed to confirm the diagnosis, and reverse transcriptase PCR was used to determine the molecular effect of a splice site mutation.
The linkage scan excluded the majority of known myopathy genes, but one linkage peak included the gene GNE, in which mutations cause autosomal recessive hereditary inclusion body myopathy type 2 (HIBM2). Muscle biopsy tissue from a patient showed myopathic features, including small basophilic fibers with vacuoles. Sequence analysis of GNE revealed affected individuals were compound heterozygous for a novel mutation in the 5' splice donor site of intron 10 (c.1816+5G>A) and a previously reported missense mutation (c.2086G>A, p.V696M), confirming the diagnosis as HIBM2. The splice site mutation correlated with exclusion of exon 10 from the transcript, which is predicted to produce an in-frame deletion (p.G545_D605del) of 61 amino acids in the kinase domain of the GNE protein. The father of the proband was heterozygous for the splice site mutation and exhibited mild distal weakness late in life.
Our study expands on the extensive allelic heterogeneity of HIBM2 and demonstrates the value of linkage analysis in resolving ambiguous clinical findings to achieve a molecular diagnosis.
- Splice Site Mutation
- Ankle Dorsiflexion
- Compound Heterozygous Mutation
- Linkage Peak
Hereditary inclusion body myopathy (HIBM) is characterized by slowly progressive muscle weakness, preferentially affecting the tibialis anterior and usually sparing the quadriceps. Onset is generally between the ages of 20 and 40 and serum creatine kinase (CK) levels are normal or minimally elevated. Histological features include the presence in myofibers of vacuoles rimmed with basophilic granular material, as well as cytoplasmic filamentous inclusions on electron microscopy . Rimmed vacuoles are a defining characteristic of HIBM, but are also observed less consistently in other muscle disorders , including limb girdle muscular dystrophy (LGMD) types 1A  and 2G . The autosomal recessive HIBM type 2 (HIBM2) is caused by mutations in the gene encoding glucosamine (UDP-N-acetyl)-2-epimerase/N-acetylmannosamine kinase (GNE) , and is allelic with distal myopathy with rimmed vacuoles (DMRV), also known as Nonaka myopathy (NM) [6–10].
We present a family with multiple siblings affected with a distal myopathy with vacuolated myofibers. Linkage analysis excluded known genes for recessive forms of LGMD and many other muscle disorders, but directed our attention to GNE as a likely candidate. The identification of compound heterozygous mutations in GNE, including a novel splice site mutation, confirmed the diagnosis as HIBM2.
Written informed consent for participation in this study was obtained for all subjects, in accordance with the Institutional Review Board of Children's Hospital Boston. Patient confidentiality was protected in accordance with the Health Insurance Portability and Accountability Act of 1996. Saliva samples were collected using the Oragene·DNA kit (DNA Genotek) and genomic DNA was isolated. Seven family members were genotyped at 10,204 single nucleotide polymorphisms using the GeneChip Human Mapping 10 K 2.0 Xba Array (Affymetrix). Genomewide multipoint parametric linkage scans were performed using MERLIN v1.1.2 . The disease allele frequency was set to 0.0001 and we used a full penetrance, zero phenocopy model. Marker map positions and Caucasian allele frequencies were provided by Affymetrix. The error checking and Pedwipe functions of MERLIN were used to remove unlikely genotypes. Amplification of candidate gene exons and splice junctions by polymerase chain reaction (PCR) and sequencing of purified products were performed by standard protocols, and sequence data were analyzed using Sequencher v4.8 (Gene Codes) and SeqScape v2.5 (Applied Biosystems). The c.1816+5G>A mutation was genotyped in DNA samples from unrelated control subjects using a Custom TaqMan SNP Genotyping Assay (Applied Biosystems). Multi-species sequence alignments were performed in ClustalW . Mutation positions were numbered relative to RefSeq transcript NM_005476.5 and isoform NP_005467.1.
Muscle biopsy tissue was available for the proband, and total RNA was isolated using the RNeasy Fibrous Tissue Mini Kit (Qiagen). Additional saliva samples were collected from the proband's parents using the Oragene·RNA kit (DNA Genotek) and total RNA was isolated using the RNeasy Mini kit (Qiagen). The c.1816+5G>A splice site mutation was characterized by reverse transcriptase PCR (RT-PCR) using the SuperScript III One-Step RT-PCR System (Invitrogen) and primers designed to amplify exons 7 through 12. RT-PCR products were screened by the QIAxcel automated capillary electrophoresis system (Qiagen). Selected products were subjected to agarose gel electrophoresis and individual bands were excised, gel-purified using the QIAquick Gel Extraction Kit (Qiagen), and sequenced.
Three of the proband's sisters were reported as affected, with onset in their 30s, but additional clinical information was unavailable. An affected brother presented at age 27 with inability to stand on tiptoe, followed later by difficulty running and walking. His progression was relatively rapid; by age 33 he began to fall and lost ambulation, whereas his four affected sisters remained ambulant with assistance at ages ranging from 39 to over 50. At the time of examination, the brother had lost nearly all movement in his legs; his weakness was too advanced to assess quadriceps sparing. He was rated as 1/5 for knee extension, knee flexion, and hip flexion strength, and 0/5 for ankle dorsiflexion and eversion. He could not stand from sitting and had severe problems with activities of daily living. A few years later he developed weakness of his upper extremities that was initially proximal but later distal, manifesting as weak grip and difficulty writing. Electromyography was not performed. Serum CK was mildly elevated at 420 U/L (reference range 57-366), and there was no cardiac, respiratory, or non-muscular neurological involvement. For both the proband and her affected brother, the diagnosis was reported at different exams as either possible limb girdle muscular dystrophy or a distal myopathy.
The proband reported both of her parents to be asymptomatic, making the mode of inheritance appear autosomal recessive, but later her father was noted to exhibit slowness in walking and a shuffling gait. Upon clinical evaluation, the mother of the proband was unaffected, and the proband's father (age 79 at exam) had full strength in his upper extremities and proximal lower limbs. However, his ankle dorsiflexion was described as weak and rated as 4+/5, and he was unable to heel-walk, indicating possible weakness of the tibialis anterior muscles. He also had difficulty toe-walking. His symptoms mimicked the pattern of weakness of his five affected children, but were markedly less severe. The age of onset of his symptoms was unknown.
Linkage scan and DNA sequence analysis
The parents of the proband originated from the same region of India, but were not known to be related. The proportion of homozygous and heterozygous genotypes in their children, compared to children of known consanguineous and non-consanguineous couples, supported the hypothesis that the parents were unrelated (data not shown). A linkage scan under an autosomal recessive model produced fourteen linkage peaks at or near the maximum possible LOD score of 1.454. The only known LGMD gene within any of these linkage peaks was CAV3, in which mutations cause autosomal dominant LGMD1C . CAV3 was screened and no mutations were found. A linkage peak on chromosome 9 contained three genes associated with different muscle disorders: VCP, TPM2, and GNE. Mutations in VCP and TPM2 were considered unlikely due to the mode of inheritance, clinical presentation, or pathological characteristics of the associated diseases not matching those of the family [14, 15]. However, review of the patients' clinical and histological information suggested their presentation was consistent with a diagnosis of HIBM.
Sequence analysis of GNE revealed the proband was heterozygous for both a novel mutation in the 5' consensus splice donor sequence of intron 10 (c.1816+5G>A) and a known missense mutation in exon 12 (c.2086G>A, p.V696M), previously reported in families of Indian and Thai origin [5, 16–18]. The mutations segregated according to the disease in all available family members and were confirmed to be in trans; the father was heterozygous for c.1816+5G>A, the mother was heterozygous for c.2086G>A (p.V696M), all three available affected children were compound heterozygous for both mutations, and the two unaffected children were both heterozygous for one of the two mutations. The novel c.1816+5G>A mutation was absent from 703 unrelated control subjects comprised of 446 of Middle Eastern ancestry and 257 of miscellaneous European ancestry. The c.1816+5G nucleotide was conserved in 18 of 20 vertebrate species examined; two species of bird had a cytosine at that position (Additional file 1: Supplemental Figure S1).
Because the proband's carrier father showed very mild myopathic symptoms and her brother was more severely affected than his affected siblings, we sequenced the gene N-acetylglucosamine kinase (NAGK) in these two individuals to search for a potential modifier allele. NAGK has been reported to be partially functionally redundant with GNE kinase activity in some model systems [19–23]. However, there were no mutations in the coding sequence or splice junctions in either subject.
We report a family with five siblings affected with HIBM2, which we diagnosed primarily by linkage analysis and identification of mutations in GNE. Recently, we used a similar approach to achieve a molecular diagnosis for a family with multiminicore disease, another rare myopathy that can be mistaken for LGMD . The exclusion in our linkage scan of almost all known myopathy genes , despite fourteen regions showing linkage at a LOD score of approximately 1.4, confirms the value of linkage analysis as a diagnostic tool even in families not informative enough to generate suggestive or significant LOD scores.
Several features of the clinical and pathological presentation of the family made the diagnosis initially uncertain. First, the proband came to medical attention prior to the identification of mutations in GNE as the cause of HIBM, so genetic testing for HIBM was not then available. Moreover, the symptoms were suggestive of LGMD, and LGMD is much more prevalent than HIBM [26–30]. HIBM is predominantly found among Middle Eastern Jewish families [5, 31] and Japanese families (as DMRV/NM) [10, 32]; it appears to be much rarer among other populations . Only a few previous families of Asian Indian ancestry have been documented with mutations in GNE [5, 16]. Furthermore, an initial biopsy of the quadriceps of the proband appeared normal, which in retrospect is consistent with a quadriceps-sparing myopathy, but may have initially confounded diagnosis. A later biopsy revealed the pathologic hallmarks of HIBM; however, the characteristic rimmed vacuoles are not specific to HIBM  and were negative for amyloid by Congo red staining, which is atypical for HIBM . Finally, because five of seven siblings were affected and their father appeared symptomatic, autosomal dominant inheritance was plausible, provided that the father's much milder symptoms could be explained by variable expressivity. Therefore, both dominant and recessive muscular dystrophies and myopathies were potential candidates.
Our linkage scans were performed under a recessive model, and our identification of compound heterozygous mutations in affected subjects confirmed this mode of inheritance. However, the father (Subject 3) was heterozygous for the c.1816+5G>A splice site mutation, and at age 79 he displayed slight weakness in his lower extremities similar in its pattern to his affected children. The predicted deletion of 61 amino acids (p.G545_D605del) in the kinase domain of GNE would be expected to result in an extremely hypomorphic or null allele, and thus the weakness in Subject 3 could possibly be a result of haploinsufficiency of GNE. Mutations showing incomplete dominance have been documented for other recessive myopathies [35–37]. However, without additional clinical examination and biopsy tissue we could not determine if the symptoms in Subject 3 represented a milder version of HIBM or normal age-related weakness. Alternatively, an unknown enhancer mutation in a modifier gene, or an effect of gender on the manifestation of the splice mutation, could potentially account for the myopathic symptoms in Subject 3 as well as the faster deterioration of his affected son than his four affected daughters.
The mechanism whereby mutations in GNE result in muscle weakness is not completely understood . Approximately 80 different mutations in GNE have been previously reported [18, 33, 39–42], of which only two are in splice sites. Like the c.1816+5G>A mutation described herein, these mutations likely result in null alleles [10, 43]. The vast majority of mutations in GNE are missense , and no patients have been recorded as homozygous or compound heterozygous for two null mutations, suggesting a complete loss of function of GNE might be lethal in humans , as in mice . Accordingly, the p.V696M mutation reported both here and previously [5, 16–18], often in conjunction with very severe mutations, may be relatively benign, as otherwise the patients might not retain enough residual GNE activity to permit life.
We demonstrate the utility of genetic analyses as a diagnostic tool for heterogeneous disorders. In a family with an undiagnosed distal myopathy, we excluded known candidate genes by linkage analysis and identified compound heterozygous mutations in GNE, which, in conjunction with biopsy analysis, confirmed the diagnosis as hereditary inclusion body myopathy type 2. A novel splice site mutation, c.1816+5G>A, resulted in skipping of exon 10 and a predicted in-frame deletion in the kinase domain of GNE, likely producing a null allele. A c.1816+5G>A carrier showed mild and late-onset distal weakness, so further study to evaluate the effect of partial GNE function may be warranted. Our data contribute to a more complete description of the clinical and allelic heterogeneity of HIBM2, and may facilitate diagnosis in other unresolved cases.
The authors thank the patients and their family for their participation in this study, Jerry Mendell for clinical histological examination and interpretation, Caitlin Kreitman and Michael Lawlor for technical assistance, and Juan Carlos Casar, Jennifer Myers, and Genri Kawahara for helpful discussions. This work was supported by K08 NS048180 (PBK), the Genise Goldenson Fund (PBK), Muscular Dystrophy Association Research Grant 186796 (PBK), the Howard Hughes Medical Institute (LMK), the Manton Center for Orphan Disease Research (LMK), and the Bernard and Alva B. Gimbel Foundation (LMK). Microarray genotyping and DNA sequencing experiments were performed in the Molecular Genetics Core Facility at Children's Hospital Boston, supported by NIH-P30-HD18655 through the Intellectual and Developmental Disabilities Research Center and NIH-P50-NS40828 through the Neuromuscular Disease Project.
- Argov Z, Yarom R: "Rimmed vacuole myopathy" sparing the quadriceps. A unique disorder in Iranian Jews. J Neurol Sci. 1984, 64 (1): 33-43. 10.1016/0022-510X(84)90053-4.View ArticlePubMedGoogle Scholar
- Neudecker S, Krasnianski M, Bahn E, Zierz S: Rimmed vacuoles in facioscapulohumeral muscular dystrophy: a unique ultrastructural feature. Acta Neuropathol. 2004, 108 (3): 257-259.View ArticlePubMedGoogle Scholar
- Hauser MA, Horrigan SK, Salmikangas P, Torian UM, Viles KD, Dancel R, Tim RW, Taivainen A, Bartoloni L, Gilchrist JM, Stajich JM, Gaskell PC, Gilbert JR, Vance JM, Pericak-Vance MA, Carpen O, Westbrook CA, Speer MC: Myotilin is mutated in limb girdle muscular dystrophy 1A. Hum Mol Genet. 2000, 9 (14): 2141-2147. 10.1093/hmg/9.14.2141.View ArticlePubMedGoogle Scholar
- Moreira ES, Vainzof M, Marie SK, Sertie AL, Zatz M, Passos-Bueno MR: The seventh form of autosomal recessive limb-girdle muscular dystrophy is mapped to 17q11-12. Am J Hum Genet. 1997, 61 (1): 151-159. 10.1086/513889.View ArticlePubMedPubMed CentralGoogle Scholar
- Eisenberg I, Avidan N, Potikha T, Hochner H, Chen M, Olender T, Barash M, Shemesh M, Sadeh M, Grabov-Nardini G, Shmilevich I, Friedmann A, Karpati G, Bradley WG, Baumbach L, Lancet D, Asher EB, Beckmann JS, Argov Z, Mitrani-Rosenbaum S: The UDP-N-acetylglucosamine 2-epimerase/N-acetylmannosamine kinase gene is mutated in recessive hereditary inclusion body myopathy. Nat Genet. 2001, 29 (1): 83-87. 10.1038/ng718.View ArticlePubMedGoogle Scholar
- Nonaka I, Sunohara N, Ishiura S, Satoyoshi E: Familial distal myopathy with rimmed vacuole and lamellar (myeloid) body formation. J Neurol Sci. 1981, 51 (1): 141-155. 10.1016/0022-510X(81)90067-8.View ArticlePubMedGoogle Scholar
- Kayashima T, Matsuo H, Satoh A, Ohta T, Yoshiura K, Matsumoto N, Nakane Y, Niikawa N, Kishino T: Nonaka myopathy is caused by mutations in the UDP-N-acetylglucosamine-2-epimerase/N-acetylmannosamine kinase gene (GNE). J Hum Genet. 2002, 47 (2): 77-79. 10.1007/s100380200004.View ArticlePubMedGoogle Scholar
- Tomimitsu H, Ishikawa K, Shimizu J, Ohkoshi N, Kanazawa I, Mizusawa H: Distal myopathy with rimmed vacuoles: novel mutations in the GNE gene. Neurology. 2002, 59 (3): 451-454.View ArticlePubMedGoogle Scholar
- Arai A, Tanaka K, Ikeuchi T, Igarashi S, Kobayashi H, Asaka T, Date H, Saito M, Tanaka H, Kawasaki S, Uyama E, Mizusawa H, Fukuhara N, Tsuji S: A novel mutation in the GNE gene and a linkage disequilibrium in Japanese pedigrees. Ann Neurol. 2002, 52 (4): 516-519. 10.1002/ana.10341.View ArticlePubMedGoogle Scholar
- Nishino I, Noguchi S, Murayama K, Driss A, Sugie K, Oya Y, Nagata T, Chida K, Takahashi T, Takusa Y, Ohi T, Nishimiya J, Sunohara N, Ciafaloni E, Kawai M, Aoki M, Nonaka I: Distal myopathy with rimmed vacuoles is allelic to hereditary inclusion body myopathy. Neurology. 2002, 59 (11): 1689-1693.View ArticlePubMedGoogle Scholar
- Abecasis GR, Cherny SS, Cookson WO, Cardon LR: Merlin--rapid analysis of dense genetic maps using sparse gene flow trees. Nat Genet. 2002, 30 (1): 97-101. 10.1038/ng786.View ArticlePubMedGoogle Scholar
- Thompson JD, Higgins DG, Gibson TJ: CLUSTAL W: improving the sensitivity of progressive multiple sequence alignment through sequence weighting, position-specific gap penalties and weight matrix choice. Nucleic Acids Res. 1994, 22 (22): 4673-4680. 10.1093/nar/22.22.4673.View ArticlePubMedPubMed CentralGoogle Scholar
- Minetti C, Sotgia F, Bruno C, Scartezzini P, Broda P, Bado M, Masetti E, Mazzocco M, Egeo A, Donati MA, Volonte D, Galbiati F, Cordone G, Bricarelli FD, Lisanti MP, Zara F: Mutations in the caveolin-3 gene cause autosomal dominant limb-girdle muscular dystrophy. Nat Genet. 1998, 18 (4): 365-368. 10.1038/ng0498-365.View ArticlePubMedGoogle Scholar
- Watts GD, Wymer J, Kovach MJ, Mehta SG, Mumm S, Darvish D, Pestronk A, Whyte MP, Kimonis VE: Inclusion body myopathy associated with Paget disease of bone and frontotemporal dementia is caused by mutant valosin-containing protein. Nat Genet. 2004, 36 (4): 377-381. 10.1038/ng1332.View ArticlePubMedGoogle Scholar
- Donner K, Ollikainen M, Ridanpaa M, Christen HJ, Goebel HH, de Visser M, Pelin K, Wallgren-Pettersson C: Mutations in the beta-tropomyosin (TPM2) gene--a rare cause of nemaline myopathy. Neuromuscul Disord. 2002, 12 (2): 151-158. 10.1016/S0960-8966(01)00252-8.View ArticlePubMedGoogle Scholar
- Huizing M, Rakocevic G, Sparks SE, Mamali I, Shatunov A, Goldfarb L, Krasnewich D, Gahl WA, Dalakas MC: Hypoglycosylation of alpha-dystroglycan in patients with hereditary IBM due to GNE mutations. Mol Genet Metab. 2004, 81 (3): 196-202. 10.1016/j.ymgme.2003.11.012.View ArticlePubMedGoogle Scholar
- Liewluck T, Pho-Iam T, Limwongse C, Thongnoppakhun W, Boonyapisit K, Raksadawan N, Murayama K, Hayashi YK, Nishino I, Sangruchi T: Mutation analysis of the GNE gene in distal myopathy with rimmed vacuoles (DMRV) patients in Thailand. Muscle Nerve. 2006, 34 (6): 775-778. 10.1002/mus.20583.View ArticlePubMedGoogle Scholar
- Voermans NC, Guillard M, Doedee R, Lammens M, Huizing M, Padberg GW, Wevers RA, van Engelen BG, Lefeber DJ: Clinical features, lectin staining, and a novel GNE frameshift mutation in hereditary inclusion body myopathy. Clin Neuropathol. 2010, 29 (2): 71-77.PubMedPubMed CentralGoogle Scholar
- Allen MB, Walker DG: Kinetic characterization of N-acetyl-D-glucosamine kinase from rat liver and kidney. Biochem J. 1980, 185 (3): 577-582.View ArticlePubMedPubMed CentralGoogle Scholar
- Hinderlich S, Nohring S, Weise C, Franke P, Stasche R, Reutter W: Purification and characterization of N-acetylglucosamine kinase from rat liver--comparison with UDP-N-acetylglucosamine 2-epimerase/N-acetylmannosamine kinase. Eur J Biochem. 1998, 252 (1): 133-139. 10.1046/j.1432-1327.1998.2520133.x.View ArticlePubMedGoogle Scholar
- Hinderlich S, Berger M, Schwarzkopf M, Effertz K, Reutter W: Molecular cloning and characterization of murine and human N-acetylglucosamine kinase. Eur J Biochem. 2000, 267 (11): 3301-3308. 10.1046/j.1432-1327.2000.01360.x.View ArticlePubMedGoogle Scholar
- Hinderlich S, Berger M, Keppler OT, Pawlita M, Reutter W: Biosynthesis of N-acetylneuraminic acid in cells lacking UDP-N-acetylglucosamine 2-epimerase/N-acetylmannosamine kinase. Biol Chem. 2001, 382 (2): 291-297. 10.1515/BC.2001.036.View ArticlePubMedGoogle Scholar
- Blume A, Berger M, Benie AJ, Peters T, Hinderlich S: Characterization of ligand binding to N-acetylglucosamine kinase studied by STD NMR. Biochemistry. 2008, 47 (49): 13138-13146. 10.1021/bi8016894.View ArticlePubMedGoogle Scholar
- Boyden SE, Salih MA, Duncan AR, White AJ, Estrella EA, Burgess SL, Seidahmed MZ, Al-Jarallah AS, Alkhalidi HM, Al-Maneea WM, Bennett RR, Alshemmari SH, Kunkel LM, Kang PB: Efficient identification of novel mutations in patients with limb girdle muscular dystrophy. Neurogenetics. 2010, 11 (4): 449-455. 10.1007/s10048-010-0250-9.View ArticlePubMedPubMed CentralGoogle Scholar
- Kaplan JC: Gene table of monogenic neuromuscular disorders (nuclear genome only) Vol 19. No 1 January 2009. Neuromuscul Disord. 2009, 19 (1): 77-98.View ArticlePubMedGoogle Scholar
- Emery AE: Population frequencies of inherited neuromuscular diseases--a world survey. Neuromuscul Disord. 1991, 1 (1): 19-29. 10.1016/0960-8966(91)90039-U.View ArticlePubMedGoogle Scholar
- van der Kooi AJ, Barth PG, Busch HF, de Haan R, Ginjaar HB, van Essen AJ, van Hooff LJ, Howeler CJ, Jennekens FG, Jongen P, Oosterhuis HJ, Padberg GW, Spaans F, Wintzen AR, Wokke JH, Bakker E, van Ommen GJ, Bolhuis PA, de Visser M: The clinical spectrum of limb girdle muscular dystrophy. A survey in The Netherlands. Brain. 1996, 119 (Pt 5): 1471-1480.View ArticlePubMedGoogle Scholar
- Urtasun M, Saenz A, Roudaut C, Poza JJ, Urtizberea JA, Cobo AM, Richard I, Garcia Bragado F, Leturcq F, Kaplan JC, Marti Masso JF, Beckmann JS, Lopez de Munain A: Limb-girdle muscular dystrophy in Guipuzcoa (Basque Country, Spain). Brain. 1998, 121 (Pt 9): 1735-1747.View ArticlePubMedGoogle Scholar
- Norwood FL, Harling C, Chinnery PF, Eagle M, Bushby K, Straub V: Prevalence of genetic muscle disease in Northern England: in-depth analysis of a muscle clinic population. Brain. 2009, 132 (Pt 11): 3175-3186.View ArticlePubMedPubMed CentralGoogle Scholar
- Jay CM, Levonyak N, Nemunaitis G, Maples PB, Nemunaitis J: Hereditary Inclusion Body Myopathy (HIBM2). Gene Regul Syst Bio. 2009, 3: 181-190.PubMedPubMed CentralGoogle Scholar
- Eisenberg I, Grabov-Nardini G, Hochner H, Korner M, Sadeh M, Bertorini T, Bushby K, Castellan C, Felice K, Mendell J, Merlini L, Shilling C, Wirguin I, Argov Z, Mitrani-Rosenbaum S: Mutations spectrum of GNE in hereditary inclusion body myopathy sparing the quadriceps. Hum Mutat. 2003, 21 (1): 99-10.1002/humu.9100.View ArticlePubMedGoogle Scholar
- Tomimitsu H, Shimizu J, Ishikawa K, Ohkoshi N, Kanazawa I, Mizusawa H: Distal myopathy with rimmed vacuoles (DMRV): new GNE mutations and splice variant. Neurology. 2004, 62 (9): 1607-1610.View ArticlePubMedGoogle Scholar
- Kurochkina N, Yardeni T, Huizing M: Molecular modeling of the bifunctional enzyme UDP-GlcNAc 2-epimerase/ManNAc kinase and predictions of structural effects of mutations associated with HIBM and sialuria. Glycobiology. 2010, 20 (3): 322-337. 10.1093/glycob/cwp176.View ArticlePubMedGoogle Scholar
- Askanas V, Engel WK, Alvarez RB: Light and electron microscopic localization of beta-amyloid protein in muscle biopsies of patients with inclusion-body myositis. Am J Pathol. 1992, 141 (1): 31-36.PubMedPubMed CentralGoogle Scholar
- Hackman P, Vihola A, Haravuori H, Marchand S, Sarparanta J, De Seze J, Labeit S, Witt C, Peltonen L, Richard I, Udd B: Tibial muscular dystrophy is a titinopathy caused by mutations in TTN, the gene encoding the giant skeletal-muscle protein titin. Am J Hum Genet. 2002, 71 (3): 492-500. 10.1086/342380.View ArticlePubMedPubMed CentralGoogle Scholar
- Fischer D, Aurino S, Nigro V, Schroder R: On symptomatic heterozygous alpha-sarcoglycan gene mutation carriers. Ann Neurol. 2003, 54 (5): 674-678. 10.1002/ana.10738.View ArticlePubMedGoogle Scholar
- Illa I, De Luna N, Dominguez-Perles R, Rojas-Garcia R, Paradas C, Palmer J, Marquez C, Gallano P, Gallardo E: Symptomatic dysferlin gene mutation carriers: characterization of two cases. Neurology. 2007, 68 (16): 1284-1289. 10.1212/01.wnl.0000256768.79353.60.View ArticlePubMedGoogle Scholar
- Broccolini A, Gidaro T, Morosetti R, Mirabella M: Hereditary inclusion-body myopathy: clues on pathogenesis and possible therapy. Muscle Nerve. 2009, 40 (3): 340-349. 10.1002/mus.21385.View ArticlePubMedGoogle Scholar
- Saechao C, Valles-Ayoub Y, Esfandiarifard S, Haghighatgoo A, No D, Shook S, Mendell JR, Rosales-Quintero X, Felice KJ, Morel CF, Pietruska M, Darvish D: Novel GNE mutations in hereditary inclusion body myopathy patients of non-Middle Eastern descent. Genet Test Mol Biomarkers. 2010, 14 (2): 157-162. 10.1089/gtmb.2009.0157.View ArticlePubMedGoogle Scholar
- Grandis M, Gulli R, Cassandrini D, Gazzerro E, Benedetti L, Narciso E, Nobbio L, Bruno C, Minetti C, Bellone E, Reni L, Mancardi GL, Mandich P, Schenone A: The spectrum of GNE mutations: allelic heterogeneity for a common phenotype. Neurol Sci. 2010, 31 (3): 377-380. 10.1007/s10072-010-0248-y.View ArticlePubMedGoogle Scholar
- Stober A, Aleo A, Kuhl V, Bornemann A, Walter MC, Lochmuller H, Lindner A, Krause S: Novel missense mutation p.A310P in the GNE gene in autosomal-recessive hereditary inclusion-body myopathy/distal myopathy with rimmed vacuoles in an Italian family. Neuromuscul Disord. 2010, 20 (5): 335-336. 10.1016/j.nmd.2010.02.013.View ArticlePubMedGoogle Scholar
- Weihl CC, Miller SE, Zaidman CM, Pestronk A, Baloh RH, Al-Lozi M: Novel GNE mutations in two phenotypically distinct HIBM2 patients. Neuromuscul Disord. 2010Google Scholar
- Broccolini A, Ricci E, Cassandrini D, Gliubizzi C, Bruno C, Tonoli E, Silvestri G, Pescatori M, Rodolico C, Sinicropi S, Servidei S, Zara F, Minetti C, Tonali PA, Mirabella M: Novel GNE mutations in Italian families with autosomal recessive hereditary inclusion-body myopathy. Hum Mutat. 2004, 23 (6): 632-View ArticlePubMedGoogle Scholar
- Schwarzkopf M, Knobeloch KP, Rohde E, Hinderlich S, Wiechens N, Lucka L, Horak I, Reutter W, Horstkorte R: Sialylation is essential for early development in mice. Proc Natl Acad Sci USA. 2002, 99 (8): 5267-5270. 10.1073/pnas.072066199.View ArticlePubMedPubMed CentralGoogle Scholar
- The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2350/12/87/prepub
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.