Novel LMNA mutations in patients with Emery-Dreifuss muscular dystrophy and functional characterization of four LMNA mutations

Juergen Scharner, Charlotte A. Brown, Matthew Bower, Susan T. Iannaccone, Ismail A. Khatri, Diana Escolar, Erynn Gordon, Kevin Felice, Carol A. Crowe, Carla Grosmann, Matthew N. Meriggioli, Alexander Asamoah, Ora Gordon, Viola F. Gnocchi, Juliet A. Ellis, Jerry R. Mendell, Peter S. Zammit

Research output: Contribution to journalArticle

39 Scopus citations

Abstract

Mutations in LMNA cause a variety of diseases affecting striated muscle including autosomal Emery-Dreifuss muscular dystrophy (EDMD), LMNA-associated congenital muscular dystrophy (L-CMD), and limb-girdle muscular dystrophy type 1B (LGMD1B). Here, we describe novel and recurrent LMNA mutations identified in 50 patients from the United States and Canada, which is the first report of the distribution of LMNA mutations from a large cohort outside Europe. This augments the number of LMNA mutations known to cause EDMD by 16.5%, equating to an increase of 5.9% in the total known LMNA mutations. Eight patients presented with either p.R249W/Q or p.E358K mutations and an early onset EDMD phenotype: two mutations recently associated with L-CMD. Importantly, 15 mutations are novel and include eight missense mutations (p.R189P, p.F206L, p.S268P, p.S295P, p.E361K, p.G449D, p.L454P, and p.W467R), three splice site mutations (c.IVS4 + 1G>A, c.IVS6 - 2A>G, and c.IVS8 + 1G>A), one duplication/in frame insertion (p.R190dup), one deletion (p.Q355del), and two silent mutations (p.R119R and p.K270K). Analysis of 4 of our lamin A mutations showed that some caused nuclear deformations and lamin B redistribution in a mutation specific manner. Together, this study significantly augments the number of EDMD patients on the database and describes 15 novel mutations that underlie EDMD, which will contribute to establishing genotype-phenotype correlations.

Original languageEnglish (US)
Pages (from-to)152-167
Number of pages16
JournalHuman mutation
Volume32
Issue number2
DOIs
StatePublished - Feb 2011

Keywords

  • EDMD
  • Emerin
  • L-CMD
  • LGMD
  • Lamin A
  • Lamin B
  • Laminopathy
  • Nuclear envelope nuclear lamina
  • Skeletal muscle

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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    Scharner, J., Brown, C. A., Bower, M., Iannaccone, S. T., Khatri, I. A., Escolar, D., Gordon, E., Felice, K., Crowe, C. A., Grosmann, C., Meriggioli, M. N., Asamoah, A., Gordon, O., Gnocchi, V. F., Ellis, J. A., Mendell, J. R., & Zammit, P. S. (2011). Novel LMNA mutations in patients with Emery-Dreifuss muscular dystrophy and functional characterization of four LMNA mutations. Human mutation, 32(2), 152-167. https://doi.org/10.1002/humu.21361