Expression of Idh1(R132H) in the Murine Subventricular Zone Stem Cell Niche Recapitulates Features of Early Gliomagenesis

• Isocitrate dehydrogenase 1 mutations drive human gliomagenesis, probably through neomorphic enzyme activity that produces D-2-hydroxyglutarate. To model this disease, we conditionally expressed Idh1(R132H) in the subventricular zone (SVZ) of the adult mouse brain. The mice developed hydrocephalus and grossly dilated lateral ventricles, with accumulation of 2-hydroxyglutarate and reduced alpha-ketoglutarate. Stem and transit amplifying/progenitor cell populations were expanded,, and proliferation increased. Cells expressing SVZ markers infiltrated surrounding brain regions. SVZ cells also gate rise to proliferative subventricular nodules. DNA methylation was globally increased, while hydroxymethylation was decreased. Mutant SVZ cells overexpressed Wnt, cell-cycle and stem cell genes, and shared an expression signature with human gliomas. Idh1(R132H) mutation in the major adult neurogenic stem cell niche causes a phenotype resembling gliomagenesis.

Subject headings

MEDICIN OCH HÄLSOVETENSKAP  -- Klinisk medicin -- Cancer och onkologi (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Clinical Medicine -- Cancer and Oncology (hsv//eng)

Keyword

integrated genomic analysis

adult mammalian brain

diffuse gliomas

idh2 mutations

mouse models

oncometabolite 2-hydroxyglutarate

l-2-hydroxyglutaric aciduria

maffucci syndrome

ollier disease

mutant

idh

Oncology

Cell Biology

Publication and Content Type

ref (subject category)

art (subject category)