The NOTCH3 score: a pre-clinical CADASIL biomarker in a novel human genomic NOTCH3 transgenic mouse model with early progressive vascular NOTCH3 accumulation
- Julie W. Rutten1,
- Roselin R. Klever1,
- Ingrid M. Hegeman2,
- Dana S. Poole3,
- Hans G. Dauwerse1, 4,
- Ludo A. M. Broos1,
- Cor Breukel1,
- Annemieke M. Aartsma-Rus1,
- J. Sjef Verbeek1,
- Louise van der Weerd1, 3,
- Sjoerd G. van Duinen2,
- Arn M. J. M. van den Maagdenberg†1, 5 and
- Saskia A. J. Lesnik Oberstein†4Email author
© Rutten et al. 2015
Received: 5 November 2015
Accepted: 14 December 2015
Published: 29 December 2015
CADASIL (Cerebral Autosomal Dominant Arteriopathy with Subcortical Infarcts and Leukoencephalopathy) is a hereditary small vessel disease caused by mutations in the NOTCH3 gene, leading to toxic NOTCH3 protein accumulation in the small- to medium sized arterioles. The accumulation is systemic but most pronounced in the brain vasculature where it leads to clinical symptoms of recurrent stroke and dementia. There is no therapy for CADASIL, and therapeutic development is hampered by a lack of feasible clinical outcome measures and biomarkers, both in mouse models and in CADASIL patients. To facilitate pre-clinical therapeutic interventions for CADASIL, we aimed to develop a novel, translational CADASIL mouse model.
We generated transgenic mice in which we overexpressed the full length human NOTCH3 gene from a genomic construct with the archetypal c.544C > T, p.Arg182Cys mutation. The four mutant strains we generated have respective human NOTCH3 RNA expression levels of 100, 150, 200 and 350 % relative to endogenous mouse Notch3 RNA expression. Immunohistochemistry on brain sections shows characteristic vascular human NOTCH3 accumulation in all four mutant strains, with human NOTCH3 RNA expression levels correlating with age at onset and progression of NOTCH3 accumulation. This finding was the basis for developing the ‘NOTCH3 score’, a quantitative measure for the NOTCH3 accumulation load. This score proved to be a robust and sensitive method to assess the progression of NOTCH3 accumulation, and a feasible biomarker for pre-clinical therapeutic testing.
This novel, translational CADASIL mouse model is a suitable model for pre-clinical testing of therapeutic strategies aimed at delaying or reversing NOTCH3 accumulation, using the NOTCH3 score as a biomarker.
KeywordsCADASIL NOTCH3 Transgenic mouse model Biomarker
Cerebral Autosomal Dominant Arteriopathy with Subcortical Infarcts and Leukoencephalopathy (CADASIL) is a hereditary small vessel disease caused by mutations in the NOTCH3 gene, leading to mid-adult onset stroke and dementia . CADASIL is characterized by accumulation of the extracellular domain of the NOTCH3 protein (NOTCH3ECD) in the media of small- to medium-sized arterioles . In addition, electron dense deposits (granular osmiophilic material, GOM) are seen in close vicinity to the vascular smooth muscle cells (VSMCs) . The arteriopathy is systemic but most pronounced in the brain where it leads to degeneration of VSMCs  and a disturbed cerebral blood flow regulation . This causes recurrent ischemic strokes and cognitive decline, starting at a mean age of 45–50 years . To date, there is no therapy to prevent or delay symptoms in CADASIL.
NOTCH3 targeting therapies are in the pre-clinical phase of development (Rutten et al., unpublished, patent no. WO 2010085151 A2). The hitherto available CADASIL mouse models have important limitations with respect to their feasibility for testing such therapeutic strategies. Available models include transgenic models overexpressing human NOTCH3 from a cDNA construct [6–8] or rat Notch3 from a genomic construct , and models in which a mutation was introduced into the endogenous Notch3 gene [10, 11]. The first and often only sign of CADASIL in these models is the presence of NOTCH3 accumulation in the vasculature , and in all human NOTCH3 transgenic models, the NOTCH3 accumulation only becomes apparent at a high age [6–8]. Only the mouse model that expresses mutant rat Notch3 protein from a genomic DNA construct shows early onset vascular Notch3 accumulation with subsequent development of brain parenchymal lesions . However, this model is less suitable as a translational CADASIL model due to the species difference, which creates an additional hurdle in bringing therapeutic compounds to clinical trials. For example, this would be the case for antisense therapeutic strategies targeting mutated pre-mRNA, a therapeutic approach which is being developed for increasing numbers of CNS disorders .
For therapeutic development, feasible clinical outcome measures and biomarkers are imperative, both in mouse disease models and in patients. In CADASIL patients, the variability in age at onset and progression of clinical symptoms, including the major symptoms of stroke and cognitive decline, limits their use as an outcome measure in clinical trials, because of the large number of patients that would have to be included to detect a treatment effect within a typical trial-timeframe of 2 years . White matter lesions, detected on T2 weighted brain MRI images, are present prior to the onset of clinical symptoms and correlate with disease severity , but are not a reliable predictor of disease progression . Changes in magnetic resonance diffusion histograms are a better predictor of disease progression, but have only been studied in symptomatic patients [16, 17]. Ideally, CADASIL therapies would be initiated in the pre-symptomatic disease phase, i.e. in young adults with a proven familial NOTCH3 mutation. Vascular NOTCH3 protein accumulation could be an interesting therapeutic biomarker for CADASIL, as increased vascular NOTCH3 staining and GOM are consistently found in skin arterioles of pre-symptomatic patients, decades before onset of stroke and cognitive decline [18, 19].
In this study, we set out to generate a novel, translational CADASIL mouse model and to develop a relevant biomarker in this model. We generated a series of human NOTCH3 transgenic mouse strains, with various expression levels of mutant NOTCH3. These mice develop cerebrovascular NOTCH3 accumulation characteristic of CADASIL at an early age, and the NOTCH3 expression level correlates with both the age at onset and progression of vascular NOTCH3 accumulation. We developed a quantitative measure for the vascular NOTCH3 accumulation load, which we show to be a sensitive and robust biomarker for CADASIL in these mice.
Materials and methods
Generation of NOTCH3 transgenic mice
NOTCH3 expression analysis in NOTCH3 transgenic mice
Total RNA was extracted from a brain hemisphere using RNA-Bee (Tel-test Inc., Friendswood, USA). For RT-PCR analysis, first-strand cDNA was synthesized using oligo (dT) primers. RT-PCR analysis was performed with primers across the human NOTCH3 transcript (exons 2–4, exons 14–16, exons 30–32, exons 32–33, and the 3′UTR). For qPCR analysis, cDNA synthesis was performed with random hexamer primers, using the Revert Aid H Minus first strand kit (Thermo Scientific, Waltham, USA). Quantitative PCR was performed in four 10-week-old male and female transgenic mice and non-transgenic littermates, using both human- (exons 7–9, 216 bps) and mouse-specific (exons 6–8, 220 bps) primers. Mouse Gapdh was used as a reference gene, and human NOTCH3 expression levels were calculated relative to endogenous mouse Notch3 expression levels. A possible effect of differences in primer efficiencies of human- and mouse-specific NOTCH3/Notch3 primersets was excluded by LinregPCR .
NOTCH3 immunohistochemistry and quantification in NOTCH3 transgenic mice
Vascular NOTCH3 accumulation in brain was analysed prospectively in groups of three mice, at age 4, 6, 12, 24, 52 and 82 weeks. In addition, vascular NOTCH3 accumulation was assessed in heart, aorta, liver, kidney, skin and tail at age 20 months. NOTCH3 immunohistochemistry was performed on cryosections that were fixated in acetone and incubated overnight with an antibody directed against the human NOTCH3ECD (Novus Biologicals, Littleton, USA; dilution 1:2000). The following day, sections were incubated with peroxidase labelled polymer conjugated to anti-rabbit immunoglobulins (Envision kit, Dako, Glostrup, Denmark), and developed using 3,3′-diaminobenzidine. Quantification of the vascular NOTCH3 accumulation load was performed on brain cryosections. Per time point (6, 24, 52 and 82 weeks), three tgN3MUT350 mice and three tgN3MUT150 mice were analysed. For each mouse, four frontal lobe brain sections were NOTCH3 immunostained simultaneously. Sections were scanned using the Ultra Fast Scanner (Philips, Eindhoven, The Netherlands), from which 10 images representative for the NOTCH3 accumulation observed in that mouse were obtained. To exclude a possible bias in image selection, a second, blinded observer was asked to obtain images independently (Additional file 1: Figure S1). ImageJ analysis was performed as follows: the image was converted into an 8-bit image, and filtered using the unsharp mask filter (radius 1, mask 0.60). Next, a threshold was set to a signal intensity of 150 to determine the NOTCH3-positive area. Within the NOTCH3-positive area, individual NOTCH3 particles were identified based on size and circularity (size = 0-30, circularity = 0.50-1.00). Finally, the NOTCH3 score was determined by quantifying the total area of the NOTCH3 positive particles within the image. The average of the three mice per time point was plotted and used for further statistical analysis.
NOTCH3 immunohistochemistry and quantification in human material
We used paraffin embedded frontal lobe brain sections from three deceased CADASIL patients (I: female age 59, p.Arg153Cys; II: female age 57, p.Arg153Cys; III: male age 70, p.Cys446Phe) and three deceased controls with no known cerebrovascular disorders (I: male age 67, II: male age 58, III: male age 53). Sections were de-waxed, rinsed with ethanol and blocked with methanol/H2O2. After heat-induced antigen retrieval in 0.01 M citrate buffer pH 6, slices were washed three times with PBS, and incubated overnight at room temperature with a 1:1 cocktail of anti-NOTCH3ECD (dilution 1:500) and anti-CD31 (Dako, Glostrup, Denmark; dilution 1:50). The following day, sections were washed and incubated for 1 hour at room temperature with a 1:1 cocktail of anti-rabbit Envision/HRP (Dako) and goat anti-mouse alkaline phosphatase (Vector Laboratories, Burlingame, CA, USA; dilution 1:25). Finally, sections were sequentially developed with 3,3′-diaminobenzidine solution and Vector Blue (Vector laboratories). Per individual, four images were taken at a 400× magnification on a Leica IM 500 microscope and analysed using ImageJ software. The vessel area was selected manually based on a positive CD31 staining. Within the vessel area, the NOTCH3 score was calculated using an intensity threshold of 100.
Electron microscopy in NOTCH3 transgenic mice
Brain tissue was fixed in 1.5 % glutaraldehyde and 1 % paraformaldehyde in 0.1 M cacodylate buffer, post-fixed in a solution of 2 % osmium tetroxide and 2 % potassium ferrocyanide, dehydrated and embedded in epon 812 (LX112). After selection of areas of interest on 1 μm toluidine stained sections, ultrathin sections were cut, contrasted with 3 % uranylacetate and Reynolds lead citrate and examined with a JEOL JEM-1011 electron microscope (Advanced Microscopy Techniques, Woburn, USA).
Statistical analyses were performed using Graphpad Prism. Differences in NOTCH3 score between the two mouse strains at a given time point were analysed using the unpaired student’s t-test. Differences in NOTCH3 score between time points were analysed using One-Way ANOVA and Fishers least significant difference post-hoc analysis. Differences in slope (i.e. the rate of increase of the NOTCH3 score) over time were analysed using linear regression.
Brain MRI of NOTCH3 transgenic mice
Brain MRI was performed in 15 mice at 20 months of age; six TgN3MUT350 mice, five tgN3WT mice, and four non-transgenic littermates. Mice were anesthetised by inhalation of 2 % isoflurane in a 1:1 mixture of oxygen and air. Respiration rate was monitored with a respiratory pad and kept between 50 and 80 respirations per minute by adjusting the isoflurane concentration. T2 weighted imaging was performed on a 7 Tesla Bruker Pharmascan using a 23 mm quadrature coil with the following parameters: TE = 12 ms, RARE factor = 8, effective TE = 48 ms, TR = 4 s, 8 averages. Field-of-view = 19x19 mm, matrix = 196x196, resulting in an in-plane resolution of 97 μm. Slice thickness = 0.5 mm, with 32 slices.
Analysis of brain parenchyma in NOTCH3 transgenic mice
After MRI, anesthetised mice were sacrificed using cardial perfusion with ice-cold phosphate buffered saline. One brain hemisphere was formalin fixated and paraffin embedded. Sections were stained with hematoxylin and eosin (H&E) to analyse the presence of infarctions, with Kluver Barrera Luxol fast blue to visualise myelin and with Perl’s iron to assess the presence of microbleeds. Astrogliosis was analysed using an anti-glial fibrillary acidic protein (GFAP) antibody (rabbit anti-GFAP, Dako; dilution 1:1000), which was incubated overnight at room temperature. As a secondary antibody, biotin labelled swine-anti Rabbit (Dako; dilution 1:600) was used, this was incubated 1 hour at room temperature. Finally, sections were incubated with avidin-biotin complex (Vectastain ABC-Elite Kit, Vector Lab, Burlingame, USA) for 30 minutes at room temperature and developed in 3,3′-diaminobenzidine solution. The detection of macrophages and myelin was performed using the Animal Research Kit peroxidase (Dako). Biotinylated primary antibodies against CD68 (anti-CD68 clone KP-1, Dako; dilution 1:1000) and myelin proteolipid protein (anti-PLP, clone plpc-1, Serotec, Kidlington, UK; dilution 1:500) were incubated overnight after heat-induced antigen retrieval in 0.01 M EDTA pH 8.0. The following day, sections were incubated with HRP- conjugated streptavidin for 30 minutes at room temperature and developed in 3,3′-diaminobenzidine solution.
Four mutant human NOTCH3 transgenic mouse strains with distinct NOTCH3 expression levels
Using qPCR analysis on RNA isolated from brain of 10-week old mice, we found that the four mutant NOTCH3 p.Arg182Cys transgenic mouse strains (tgN3MUT) had human NOTCH3 expression levels of 100, 150, 200 and 350 %, respectively, compared to endogenous mouse Notch3 expression (Fig. 1c). Human NOTCH3 expression in the lowest expressing tgN3MUT strain, was comparable to that in the wild-type strain (tgN3WT), i.e. ~100 %. RT-PCR analysis with multiple NOTCH3 primer sets spanning the complete transcript, showed that the complete human NOTCH3 cDNA was present in the transgenic transcript (Additional file 1: Figure S2). There was no difference in endogenous mouse Notch3 expression between transgenic and non-transgenic mice (Additional file 1: Figure S3).
Age at onset of vascular NOTCH3 protein accumulation correlates with NOTCH3 expression levels
The NOTCH3 RNA expression level correlates with the age at onset of cerebrovascular NOTCH3 protein accumulation
NOTCH3 expression levela
Age at onset NOTCH3 accumulationb
Development of the NOTCH3 score, a quantitative biomarker for CADASIL
No clear brain parenchyma phenotype in tgN3MUT mice
Finally, to determine whether we could correlate the NOTCH3 score to a brain phenotype in tgN3MUT mice, we performed brain MRI and histopathology in mice aged 20 months (Additional file 1, Figure S4, S5). In two of the six tgN3MUT350 mice, hyperintensities were seen on T2 weighted images, cranial to the corpus callosum and around the ventricles in the frontal lobe. However, similar hyperintensities were found in one non-transgenic littermate. Histopathological examination did not show any signs of astrogliosis or white matter lesions in the mutant mice. The absence of consistent and specific brain abnormalities in tgN3MUT mice prohibited the testing of a potential correlation between NOTCH3 score and brain phenotype.
To facilitate the testing of pre-clinical therapeutic interventions for CADASIL, we generated a translational, human genomic NOTCH3 transgenic mouse model with an early vascular phenotype, and developed a biomarker in this model. The mutant mice recapitulate the CADASIL vascular phenotype with early onset and progressive cerebrovascular NOTCH3 accumulation and GOM deposits in arterioles. The respective NOTCH3 RNA expression levels in the four mutant mouse strains correlate strongly and consistently with the age at onset and progression of NOTCH3 protein accumulation, with the highest expressing mouse strain developing vascular NOTCH3 accumulation as early as 6 weeks of age. The quantitative biomarker we developed, the NOTCH3 score, allows for a sensitive and objective measure of NOTCH3 accumulation, which can therefore be used for pre-clinical testing of therapeutic strategies aimed at delaying or reversing NOTCH3 accumulation.
Cerebrovascular NOTCH3 accumulation was selected as a potential biomarker because it was consistently and specifically found in tgN3MUT mice, and showed an early age at onset and clear progression. Also, NOTCH3 accumulation is a plausible surrogate marker for CADASIL because it is universally present in the cerebrovasculature of CADASIL patients and is believed to play an important role in disease pathophysiology . Because of the lack of consistent brain abnormalities in our mice, we were unable to correlate the NOTCH3 score to a brain phenotype. However, an early age at onset of NOTCH3 accumulation has previously been found to be associated with the development of brain parenchymal damage in mice . Moreover, age is one of the most important predictors of CADASIL disease severity and progression [14, 23], implicating that the age-dependent increase in NOTCH3 score is a relevant surrogate marker for disease progression. Sample size calculations we performed show that the NOTCH3 score is a feasible biomarker for pre-clinical therapeutic studies, as an effect on NOTCH3 accumulation can be assessed in relatively small groups of mice. For example, treatment of 7 mice allows for the detection of a 50 % effect on the progression of the NOTCH3 score, when treating from 6 to 24 weeks of age.
We found that the NOTCH3 score can also be measured in the cerebrovasculature of deceased CADASIL patients. Evidently, a NOTCH3 score in brain sections is not a feasible biomarker in clinical trials. However, vascular NOTCH3 accumulation has been extensively demonstrated in skin biopsies of CADASIL patients and is detectable decades before the onset of clinical symptoms [18, 19]. In a single family study, an age-dependent increase in GOM deposits in skin biopsies was found up to 50 years of age . Although previous studies did not find a correlation between skin biopsy NOTCH3 immunostaining and disease severity, these studies were limited by a qualitative assessment of the NOTCH3 staining intensity [18, 19]. Whether such a correlation can be established using our quantitative NOTCH3 score, will have to be assessed in future prospective studies.
This novel CADASIL mouse model is especially suitable for testing therapeutic strategies for a number of reasons. The presence of the human NOTCH3 gene in our mouse model allows for testing compounds specifically directed at human NOTCH3, thereby avoiding an additional hurdle in the translation from pre-clinical to clinical trials. The fact that we used a genomic NOTCH3 construct allows for testing therapeutic interventions that target mutant NOTCH3 at the genomic or (pre-) mRNA level. Such interventions, for example using antisense oligonucleotides to reduce or modify mutant NOTCH3 protein, are being developed in our lab (Rutten et al., unpublished, patent no. WO 2010085151 A2). Another practical advantage is that in this early onset model, treatment can be initiated at an early age.
In conclusion, we developed a novel, unique human NOTCH3 transgenic mouse model and a NOTCH3 score which is a robust and sensitive biomarker for CADASIL. This translational model is ideally suited for pre-clinical testing of therapeutic strategies aimed at delaying or reversing NOTCH3 protein accumulation.
Cerebral Autosomal Dominant Arteriopathy with Subcortical Infarcts and Leukoencephalopathy
- NOTCH3ECD :
Extracellular domain of the NOTCH3 protein
Granular osmiophillic material
Vascular smooth muscle cells
Magnetic resonance imaging
This work was financially supported by the Netherlands Organisation for Health Research and Development (ZonMw) (JWR, AAR and SAJLO) and the Netherlands Genomics Initiative (NGI)/NOW (AMJMvdM). The authors would like to thank Jos van der Kaa for oocyte injections, Nathalie Rieff and Stephany Koelewijn for technical assistance, Sandra van Heiningen for mouse breeding, employees of the LUMC animal facility for mouse upkeep, and Peter Neeskens for electron microscopy sample preparation.
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- Joutel A, Corpechot C, Ducros A, Vahedi K, Chabriat H, Mouton P, et al. Notch3 mutations in CADASIL, a hereditary adult-onset condition causing stroke and dementia. Nature. 1996;383:707–10.PubMedView ArticleGoogle Scholar
- Joutel A, Andreux F, Gaulis S, Domenga V, Cecillon M, Battail N, et al. The ectodomain of the Notch3 receptor accumulates within the cerebrovasculature of CADASIL patients. J Clin Invest. 2000;105:597–605.PubMedPubMed CentralView ArticleGoogle Scholar
- Ruchoux MM, Guerouaou D, Vandenhaute B, Pruvo JP, Vermersch P, Leys D. Systemic vascular smooth muscle cell impairment in cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy. Acta Neuropathol. 1995;89:500–12.PubMedView ArticleGoogle Scholar
- Pfefferkorn T, von Stuckrad-Barre S, Herzog J, Gasser T, Hamann GF, Dichgans M. Reduced cerebrovascular CO(2) reactivity in CADASIL: A transcranial Doppler sonography study. Stroke. 2001;32:17–21.PubMedView ArticleGoogle Scholar
- Chabriat H, Joutel A, Dichgans M, Tournier-Lasserve E, Bousser MG. Cadasil. Lancet Neurol. 2009;8:643–53.PubMedView ArticleGoogle Scholar
- Arboleda-Velasquez JF, Manent J, Lee JH, Tikka S, Ospina C, Vanderburg CR, et al. PNAS Plus: Hypomorphic Notch 3 alleles link Notch signaling to ischemic cerebral small-vessel disease. Proc Natl Acad Sci U S A. 2011;108:E128–35.PubMedPubMed CentralView ArticleGoogle Scholar
- Monet-Lepretre M, Bardot B, Lemaire B, Domenga V, Godin O, Dichgans M, et al. Distinct phenotypic and functional features of CADASIL mutations in the Notch3 ligand binding domain. Brain. 2009;132:1601–12.PubMedPubMed CentralView ArticleGoogle Scholar
- Ruchoux MM, Domenga V, Brulin P, Maciazek J, Limol S, Tournier-Lasserve E, et al. Transgenic mice expressing mutant Notch3 develop vascular alterations characteristic of cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy. Am J Pathol. 2003;162:329–42.PubMedPubMed CentralView ArticleGoogle Scholar
- Joutel A, Monet-Lepretre M, Gosele C, Baron-Menguy C, Hammes A, Schmidt S, et al. Cerebrovascular dysfunction and microcirculation rarefaction precede white matter lesions in a mouse genetic model of cerebral ischemic small vessel disease. J Clin Invest. 2010;120:433–45.PubMedPubMed CentralView ArticleGoogle Scholar
- Lundkvist J, Zhu S, Hansson EM, Schweinhardt P, Miao Q, Beatus P, et al. Mice carrying a R142C Notch 3 knock-in mutation do not develop a CADASIL-like phenotype. Genesis. 2005;41:13–22.PubMedView ArticleGoogle Scholar
- Wallays G, Nuyens D, Silasi-Mansat R, Souffreau J, Callaerts-Vegh Z, Van NA, et al. Notch3 Arg170Cys knock-in mice display pathologic and clinical features of the neurovascular disorder cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy. Arterioscler Thromb Vasc Biol. 2011;31:2881–8.PubMedView ArticleGoogle Scholar
- Joutel A. Pathogenesis of CADASIL: transgenic and knock-out mice to probe function and dysfunction of the mutated gene, Notch3, in the cerebrovasculature. Bioessays. 2011;33:73–80.PubMedView ArticleGoogle Scholar
- Evers MM, Toonen LJ, van Roon-Mom WM. Antisense oligonucleotides in therapy for neurodegenerative disorders. Adv Drug Deliv Rev. 2015;87:90–103.PubMedView ArticleGoogle Scholar
- Peters N, Herzog J, Opherk C, Dichgans M. A two-year clinical follow-up study in 80 CADASIL subjects: progression patterns and implications for clinical trials. Stroke. 2004;35:1603–8.PubMedView ArticleGoogle Scholar
- Dichgans M, Filippi M, Bruning R, Iannucci G, Berchtenbreiter C, Minicucci L, et al. Quantitative MRI in CADASIL: correlation with disability and cognitive performance. Neurology. 1999;52:1361–7.PubMedView ArticleGoogle Scholar
- Holtmannspotter M, Peters N, Opherk C, Martin D, Herzog J, Bruckmann H, et al. Diffusion magnetic resonance histograms as a surrogate marker and predictor of disease progression in CADASIL: a two-year follow-up study. Stroke. 2005;36:2559–65.PubMedView ArticleGoogle Scholar
- Molko N, Pappata S, Mangin JF, Poupon F, LeBihan D, Bousser MG, et al. Monitoring disease progression in CADASIL with diffusion magnetic resonance imaging: a study with whole brain histogram analysis. Stroke. 2002;33:2902–8.PubMedView ArticleGoogle Scholar
- Joutel A, Favrole P, Labauge P, Chabriat H, Lescoat C, Andreux F, et al. Skin biopsy immunostaining with a Notch3 monoclonal antibody for CADASIL diagnosis. Lancet. 2001;358:2049–51.PubMedView ArticleGoogle Scholar
- Lesnik Oberstein SA, van Duinen SG, van den Boom R, Maat-Schieman ML, van Buchem MA, van Houwelingen HC, et al. Evaluation of diagnostic NOTCH3 immunostaining in CADASIL. Acta Neuropathol. 2003;106:107–11.PubMedView ArticleGoogle Scholar
- Tischer BK, von Einem J, Kaufer B, Osterrieder N. Two-step red-mediated recombination for versatile high-efficiency markerless DNA manipulation in Escherichia coli. Biotechniques. 2006;40:191–7.PubMedView ArticleGoogle Scholar
- Ruijter JM, Ramakers C, Hoogaars WM, Karlen Y, Bakker O, van den Hoff MJ, et al. Amplification efficiency: linking baseline and bias in the analysis of quantitative PCR data. Nucleic Acids Res. 2009;37:e45.PubMedPubMed CentralView ArticleGoogle Scholar
- Monet-Lepretre M, Haddad I, Baron-Menguy C, Fouillot-Panchal M, Riani M, Domenga-Denier V, et al. Abnormal recruitment of extracellular matrix proteins by excess Notch3ECD: a new pathomechanism in CADASIL. Brain. 2013;136:1830–45.PubMedPubMed CentralView ArticleGoogle Scholar
- Dichgans M, Mayer M, Uttner I, Bruning R, Muller-Hocker J, Rungger G, et al. The phenotypic spectrum of CADASIL: clinical findings in 102 cases. Ann Neurol. 1998;44:731–9.PubMedView ArticleGoogle Scholar
- Brulin P, Godfraind C, Leteurtre E, Ruchoux MM. Morphometric analysis of ultrastructural vascular changes in CADASIL: analysis of 50 skin biopsy specimens and pathogenic implications. Acta Neuropathol. 2002;104:241–8.PubMedGoogle Scholar