Partial deletions of the GRN gene are a cause of frontotemporal lobar degeneration

Fabienne Clot, Anne Rovelet-Lecrux, Foudil Lamari, Sandrine Noël, Boris Keren, Agnès Camuzat, Agnès Michon, Ludmila Jornea, Béatrice Laudier, Anne De Septenville, Paola Caroppo, Dominique Campion, Cécile Cazeneuve, Alexis Brice, Eric Leguern, Isabelle Le Ber

Research output: Contribution to journalArticle

Abstract

Mutations in the progranulin gene (GRN) are an important cause of frontotemporal lobar degeneration (FTLD). Most known GRN mutations are null mutations, such as nonsense and frameshift mutations, which create a premature stop codon resulting in loss of function of the progranulin protein. Complete or near-complete genomic GRN deletions have also been found in three families, but heterozygous partial deletions that remove only one or two exons have not been reported to date. In this study, we analysed three unrelated FTLD patients with low plasma progranulin levels but no point GRN mutations by multiplex ligation-dependent probe amplification (MLPA) and quantitative multiplex polymerase chain reaction of short fluorescent fragments (QMPSF). We detected two heterozygous partial GRN deletions in two patients. One deletion removed exon 1 and part of intron 1. The second deletion was complex: it removed 1,410 bp extending from the part of intron 1 to the part of exon 3, with a small 5-bp insertion at the breakpoint junction (c.-7-1121-159delinsGATCA). Our findings illustrate the usefulness of a quantitative analysis in addition to GRN gene sequencing for a comprehensive genetic diagnosis of FTLD, particularly in patients with low plasma progranulin levels.

Original languageEnglish
Pages (from-to)95-100
Number of pages6
JournalNeurogenetics
Volume15
Issue number2
DOIs
Publication statusPublished - 2014

Keywords

  • Deletion
  • FTD
  • FTLD
  • PGRN/GRN
  • Progranulin

ASJC Scopus subject areas

  • Genetics(clinical)
  • Cellular and Molecular Neuroscience
  • Genetics
  • Medicine(all)

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  • Cite this

    Clot, F., Rovelet-Lecrux, A., Lamari, F., Noël, S., Keren, B., Camuzat, A., Michon, A., Jornea, L., Laudier, B., De Septenville, A., Caroppo, P., Campion, D., Cazeneuve, C., Brice, A., Leguern, E., & Le Ber, I. (2014). Partial deletions of the GRN gene are a cause of frontotemporal lobar degeneration. Neurogenetics, 15(2), 95-100. https://doi.org/10.1007/s10048-014-0389-x