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Am J Hum Genet. 2012 Jun 8;90(6):1102-7. doi: 10.1016/j.ajhg.2012.04.021. Epub 2012 May 17.

Strikingly different clinicopathological phenotypes determined by progranulin-mutation dosage.

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  • 1Bioinformatics Division, The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia.

Abstract

We performed hypothesis-free linkage analysis and exome sequencing in a family with two siblings who had neuronal ceroid lipofuscinosis (NCL). Two linkage peaks with maximum LOD scores of 3.07 and 2.97 were found on chromosomes 7 and 17, respectively. Unexpectedly, we found these siblings to be homozygous for a c.813_816del (p.Thr272Serfs∗10) mutation in the progranulin gene (GRN, granulin precursor) in the latter peak. Heterozygous mutations in GRN are a major cause of frontotemporal lobar degeneration with TDP-43 inclusions (FTLD-TDP), the second most common early-onset dementia. Reexamination of progranulin-deficient mice revealed rectilinear profiles typical of NCL. The age-at-onset and neuropathology of FTLD-TDP and NCL are markedly different. Our findings reveal an unanticipated link between a rare and a common neurological disorder and illustrate pleiotropic effects of a mutation in the heterozygous or homozygous states.

Copyright © 2012 The American Society of Human Genetics. Published by Elsevier Inc. All rights reserved.

PMID:
22608501
[PubMed - indexed for MEDLINE]
PMCID:
PMC3370276
Free PMC Article
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