Limb girdle muscular dystrophies (LGMD) are characterized by genetic and clinical heterogeneity: seven autosomal dominant and 12 autosomal recessive loci have so far been identified. Aims of this study were to evaluate the relative proportion of the different types of LGMD in 181 predominantly Italian LGMD patients (representing 155 independent families), to describe the clinical pattern of the different forms, and to identify possible correlations between genotype, phenotype, and protein expression levels, as prognostic factors. Based on protein data, the majority of probands (n=72) presented calpain-3 deficiency; other defects were as follows: dysferlin (n=31), sarcoglycans (n=32), -dystroglycan (n=4), and caveolin-3 (n=2). Genetic analysis identified 111 different mutations, including 47 novel ones. LGMD relative frequency was as follows: LGMD1C (caveolin-3) 1.3%; LGMD2A (calpain-3) 28.4%; LGMD2B (dysferlin) 18.7%; LGMD2C (-sarcoglycan) 4.5%; LGMD2D (-sarcoglycan) 8.4%; LGMD2E (-sarcoglycan) 4.5%; LGMD2F (-sarcoglycan) 0.7%; LGMD2I (Fukutin-related protein) 6.4%; and undetermined 27.1%. Compared to Northern European populations, Italian patients are less likely to be affected with LGMD2I. The order of decreasing clinical severity was: sarcoglycanopathy, calpainopathy, dysferlinopathy, and caveolinopathy. LGMD2I patients showed both infantile noncongenital and mild late-onset presentations. Age at disease onset correlated with variability of genotype and protein levels in LGMD2B. Truncating mutations determined earlier onset than missense substitutions (20±5.1 years vs. 36.7±11.1 years; P=0.0037). Similarly, dysferlin absence was associated with an earlier onset when compared to partial deficiency (20.2±standard deviation [SD] 5.2 years vs. 28.4±SD 11.2 years; P=0.014).

Clinical, molecular, and protein correlations in a large sample of genetically diagnosed Italian limb girdle muscular dystrophy patients / M. Guglieri, F. Magri, M.G. D’Angelo, A. Prelle, L. Morandi, C. Rodolico, R. Cagliani, M. Mora, F. Fortunato, A. Bordoni, R. Del Bo, S. Ghezzi, S. Pagliarani, S. Lucchiari, S. Salani, C. Zecca, C. Lamperti, D. Ronchi, M. Aguennouz, P. Ciscato, C. Di Blasi, A. Ruggieri, I. Moroni, A. Turconi, M. Moggio, A. Toscano, N. Bresolin, G.P. Comi. - In: HUMAN MUTATION. - ISSN 1059-7794. - 29:2(2008 Feb), pp. 258-266.

Clinical, molecular, and protein correlations in a large sample of genetically diagnosed Italian limb girdle muscular dystrophy patients

M. Guglieri
Primo
;
F. Magri
Secondo
;
F. Fortunato;A. Bordoni;R. Del Bo;S. Pagliarani;S. Lucchiari;S. Salani;C. Zecca;C. Lamperti;D. Ronchi;N. Bresolin
Penultimo
;
G.P. Comi
Ultimo
2008

Abstract

Limb girdle muscular dystrophies (LGMD) are characterized by genetic and clinical heterogeneity: seven autosomal dominant and 12 autosomal recessive loci have so far been identified. Aims of this study were to evaluate the relative proportion of the different types of LGMD in 181 predominantly Italian LGMD patients (representing 155 independent families), to describe the clinical pattern of the different forms, and to identify possible correlations between genotype, phenotype, and protein expression levels, as prognostic factors. Based on protein data, the majority of probands (n=72) presented calpain-3 deficiency; other defects were as follows: dysferlin (n=31), sarcoglycans (n=32), -dystroglycan (n=4), and caveolin-3 (n=2). Genetic analysis identified 111 different mutations, including 47 novel ones. LGMD relative frequency was as follows: LGMD1C (caveolin-3) 1.3%; LGMD2A (calpain-3) 28.4%; LGMD2B (dysferlin) 18.7%; LGMD2C (-sarcoglycan) 4.5%; LGMD2D (-sarcoglycan) 8.4%; LGMD2E (-sarcoglycan) 4.5%; LGMD2F (-sarcoglycan) 0.7%; LGMD2I (Fukutin-related protein) 6.4%; and undetermined 27.1%. Compared to Northern European populations, Italian patients are less likely to be affected with LGMD2I. The order of decreasing clinical severity was: sarcoglycanopathy, calpainopathy, dysferlinopathy, and caveolinopathy. LGMD2I patients showed both infantile noncongenital and mild late-onset presentations. Age at disease onset correlated with variability of genotype and protein levels in LGMD2B. Truncating mutations determined earlier onset than missense substitutions (20±5.1 years vs. 36.7±11.1 years; P=0.0037). Similarly, dysferlin absence was associated with an earlier onset when compared to partial deficiency (20.2±standard deviation [SD] 5.2 years vs. 28.4±SD 11.2 years; P=0.014).
Genotype-phenotype; LGMD; Limb girdle muscular dystrophy
feb-2008
Article (author)
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/59956
Citazioni
  • ???jsp.display-item.citation.pmc??? 44
  • Scopus 149
  • ???jsp.display-item.citation.isi??? 129
social impact