Cited by 378Dementia and Cognitive Impairment ResearchAlzheimer's disease research and treatmentsGenomics and Rare Diseases

Using Exome Sequencing to Reveal Mutations in TREM2 Presenting as a Frontotemporal Dementia–like Syndrome Without Bone Involvement

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Guerreiro, Rita João, Lohmann, Ebba, Brás, José Miguel, Gibbs, Jesse Raphael, Rohrer, Jonathan D., Gurunlian, Nicole, Dursun, Burcu, Bilgic, Basar +5 more·2013·JAMA Neurology

Abstract

OBJECTIVE: To identify new genes and risk factors associated with frontotemporal dementia (FTD). Several genes and loci have been associated with different forms of FTD, but a large number of families with dementia do not harbor mutations in these genes. DESIGN: Whole-exome sequencing and whole-genome genotyping were performed in all patients. Genetic variants obtained from whole-exome sequencing were integrated with the data obtained from whole-genome genotyping. SETTING: Database of the Behavioral Neurology Outpatient Clinic of the Department of Neurology, Istanbul Faculty of Medicine, Istanbul, Turkey. PATIENTS Forty-four Turkish patients with an FTD-like clinical diagnosis were included in the study. Relatives were screened when appropriate. MAIN OUTCOME MEASURE: Mutations in the triggering receptor expressed on myeloid cells 2 gene (TREM2). RESULTS: In 3 probands with FTD-like disease, we identified different homozygous mutations in TREM2 that had previously been associated with polycystic lipomembranous osteodysplasia with sclerosing leukoencephalopathy (PLOSL). None of these 3 patients had a typical clinical presentation of PLOSL: they presented with behavioral change and subsequent cognitive impairment and motor features but without any bone cysts or bone-associated phenotypes. Imaging showed white matter abnormalities as well as frontal atrophy in all 3 patients. CONCLUSIONS: Our results show that TREM2 is responsible for an unexpectedly high number of dementia cases in our cohort, suggesting that this gene should be taken into account when mutations in other dementia genes are excluded. Even for complex syndromes such as dementia, exome sequencing has proven to be a rapid and cost-effective tool to identify genetic mutations, allowing for the association of clinical phenotypes with unexpected molecular underpinnings.

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Crossref · 10.1001/jamaneurol.2013.579

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  • There is converging evidence for the role of neuroinflammation in neurodegenerative dementias, including frontotemporal dementia, from genetic associations, CSF, epidemiology, post-mortem tissue and animal models.

    “In particular, there is converging evidence for the role of neuroinflammation in neurodegenerative dementias, including FTD, from genetic associations (Guerreiro et al., 2013; Rayaprolu et al., 2013; Broce et al., 2018), CSF (Sjogren et al., 2004; Woollacott et al., 2018), epidemiology (Miller et al., 2013, 2016), post-mortem tissue (Venneti et al., 2008; Lant et al., 2014) and animal models”
  • Nonsense or missense mutations in TREM2 have been identified in several families with FTD.

    “Nonsense or missense mutations in TREM2 have been identified in several families with FTD.343–345”
  • Homozygous TREM2 p.T66M mutation has been identified to cause FTD-like syndrome.

    “Homozygous TREM2 p.T66M mutation has also been identified to cause FTD-like syndrome.344”
  • Further TREM2 variants such as R62H, H157Y, Q33X, T66M and Y38C are risk factors of Alzheimer's disease or other CNS diseases.

    “In addition to the R47H variant, further TREM2 variants have been revealed to be risk factors of AD or other CNS diseases, such as R62H (8,20), H157Y (25), Q33X, T66M and Y38C (26,27).”

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Authors
Guerreiro, R. J., Lohmann, E., Brás, J. M., Gibbs, J. R., Rohrer, J. D., Gurunlian, N., Dursun, B., Bilgic, B., Hanagasi, H., Gurvit, H., Emre, M., Singleton, A., & Hardy, J.
Affiliations
National Institutes of Health (US)
Venue
JAMA Neurology
Published
2013-01-01
Volume
70
Issue
1
Pages
78
ISSN
2168-6149 (ISSN-L)
OpenAlex
W1984557585
Cited by
374
References
27
Citations by year
2026: 18 · 2025: 23 · 2024: 20 · 2023: 17 · 2022: 12 · 2021: 39 · 2020: 34 · 2019: 22 · 2018: 32 · 2017: 37 · 2016: 29 · 2015: 40 · 2014: 26 · 2013: 21 · 2012: 3
FWCI
27.37
Type
journal article
Language
en
Open access
Locations
  • JAMA Neurology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • UCL Discovery (University College London) (submittedVersion)
Funders
  • Wellcome Trust (089698)
  • National Institutes of Health
  • National Institute on Aging (Z01AG000950)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genomics and Rare Diseases
Keywords
TREM2, frontotemporal dementia, homozygous mutation, genetic diagnosis, white matter abnormalities, behavior change, cognitive impairment, exome sequencing, Turkish patients
MeSH terms
Adult, Humans, Male, Membrane Glycoproteins, Mutation, Receptors, Immunologic, Risk Factors, Syndrome, Frontotemporal Dementia, Exome

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