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PubMed2000

[CADASIL: clinical analysis of CADASIL and CADASIL-like disorders in Japan].

To clarify the characteristics of CADASIL in Japan, we performed clinical and genetic investigations for six patients from 5 Japanese families diagnosed as CADASIL. We identified that the onset of focal neurologic deficits ranged from 38 to 63 years old (mean 49 +/- 9.4 yrs) and the occurrence rates of main neurologic symptoms and signs were 1/6 for migraine, 3/6 for recurrent stroke episodes, 6/6 for dementia, and 4/6 for pseudobulbar palsy. The marked narrowing of retinal arteries were observed in 3/6. The notch 3 mutations were all found in exon 4. Although other several families shared similar phenotype of CADASIL, there were no deposition of granular osmiophilic materials within the basal lamina of smooth muscle cells in the arterioles of biopsied muscle and no mutations in the cording regions of notch 3 gene. We investigated prospectively the incidence of CADASIL and CADASIL-like disease in Kumamoto district from 1999 to 2000. One thousand and thirty four patients with stroke were hospitalized in 6 hospitals which have stroke care unit. Among them, 7 patients fulfilled the criteria that were less than 60 years old, lacunar strokes and/or TIA, presence of a family history, and no risk factors such as hypertension, diabetes mellitus, and hyperlipidemia. One of seven patients was diagnosed as CADASIL by DNA analysis. It was suspected the incidences of CADASIL and CADASIL-like disease were not so rare in Japan.

Cerebral Infarction↗
PubMed2002

Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) and CADASIL-like disorders in Japan.

We reviewed 12 patients from 11 Japanese families diagnosed as having CADASIL from 1998 to 2001. The age of onset of focal neurologic deficits ranged from 38 to 71 years (mean: 50.4 +/- 9.8 years). Japanese CADASIL patients rarely had migraine and frequently presented with symptoms of dementia at diagnosis. Notch3 mutations were concentrated in exons 3, 4, and 5. Cysteine was replaced by another amino acid or vice versa in the majority of Japanese CADASIL patients. However, in 2 families, the mutations were not related to cysteine. In the prospective study, 2030 patients with stroke were hospitalized in 6 hospitals with stroke units in the Kumamoto district from 1999 to 2001. Among them, 14 patients fulfilled the criteria of being less than 60 years of age, showing lacunar strokes and/or TIA, presence of a family history, and no risk factors of stroke. One of these 14 patients was diagnosed as having CADASIL by DNA analysis. However, if hyperlipidemia was excluded from the list, 16 patients fulfilled the criteria and 2 patients were diagnosed as having CADASIL by DNA analysis. It was suspected that the incidence of CADASIL is not so rare in Japan. There were some families with CADASIL-like features, but without Notch3 mutations or GOM, suggesting the need for genetic analysis in the future.

Adult↗
PubMed1996

Identification of a key recombinant narrows the CADASIL gene region to 8 cM and argues against allelism of CADASIL and familial hemiplegic migraine.

Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CA-DASIL) is a nonarteriosclerotic, nonamyloid angiopathy characterized by recurrent subcortical ischemic strokes starting in midadulthood and frequently leading to pseudobulbar palsy and dementia. The disease locus has recently been mapped to chromosome 19q12. We have identified a chromosomal crossover in a clinically affected family member, which refines the localization of the CADASIL disease locus. Multipoint linkage analysis established the best estimate for the gene locus within an 8-cM interval bracketed by D19S226 and D19S222. This estimate strongly argues against allelism of CADASIL and familial hemiplegic migraine.

Alleles↗
PubMed1999

Diagnostic Notch3 sequence analysis in CADASIL: three new mutations in Dutch patients. Dutch CADASIL Research Group.

To confirm the clinical diagnosis in individual Dutch patients with cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL), we performed direct sequence analysis of the abnormal gene, Notch3, in patients from 11 families without prior linkage analysis to chromosome 19. Eleven missense mutations involving the loss or gain of a cysteine residue were found, of which 3 are new. Exon 4 is a mutation hotspot (9 of 11 families). Notch3 sequence analysis of CADASIL patients in a diagnostic laboratory is a feasible procedure to confirm the clinical diagnosis in individual patients.

Cerebral Arterial Diseases↗
PubMed2001

Hyperhomocysteinemia in patients with cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL).

OBJECTIVE: To determine whether patients with cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) had evidence of increased homocysteine levels compared with non-CADASIL patients with ischemic stroke or transient ischemic attack. PATIENTS AND METHODS: We compared fasting plasma homocysteine levels and levels 6 hours after oral loading with methionine, 100 mg/kg, in non-CADASIL patients with ischemic stroke or transient ischemic attack and in patients with CADASIL. Prechallenge, postchallenge, and change in homocysteine levels between the 2 groups were compared with use of the Wilcoxon rank sum test. RESULTS: CADASIL and non-CADASIL groups were similar in age (mean, 48.8 vs. 46.5 years, respectively; 2-tailed t test, P=.56) and sex (men, 86% vs 59%; Fisher exact test, P=.12). The 59 patients in the CADASIL group had higher median plasma homocysteine levels compared with the 14 patients in the non-CADASIL group, both in the fasting state (12.0 vs 9.0 micromol/L; P=.03) and after methionine challenge (51.0 vs 34.0 micromol/L; P=.007). Median difference between homocysteine levels before and after methionine challenge was greater in the CADASIL group than in the non-CADASIL group (34.5 vs. 24.0 micromol/ L; P = .02). CONCLUSION: Our findings raise the possibility that increased homocysteine levels or abnormalities of homocysteine metabolism may have a role in the pathogenesis of CADASIL.

Adult↗
PubMed2004

Abnormal vasoconstrictor responses to angiotensin II and noradrenaline in isolated small arteries from patients with cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL).

BACKGROUND AND PURPOSE: Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is characterized by ultrastructural abnormalities in small cerebral and systemic vessels. We assessed vasomotor function in systemic small arteries in CADASIL. METHODS: We studied 10 CADASIL patients and 10 control subjects. Resistance arteries isolated from gluteal biopsies were mounted on small-vessel myographs, and concentration responses were determined for vasoconstrictors (noradrenaline, angiotensin II, and endothelin-I) and vasodilators (acetylcholine, bradykinin, spermine-NONOate, and nifedipine). Maximum data are shown as percent potassium contraction. RESULTS: There was reduced potency for noradrenaline in CADASIL (CADASIL [38 arteries]: EC50, 240 nmol/L; control subjects [27 arteries]: EC50, 100 nmol/L; 2-way analysis of variance, F=9.76, P=0.002). Maximum response to angiotensin II was greater in CADASIL (120+/-8% versus 97+/-5% in control subjects; F=4.28, P=0.043). Tachyphylaxis to angiotensin II occurred in all control subjects studied but in only 3 of 9 CADASIL subjects (P=0.011, Fisher's exact test). Vasodilation was similar in CADASIL patients compared with control subjects for endothelium-dependent dilators (acetylcholine and bradykinin) and endothelium-independent dilators (spermine-NONOate and nifedipine). CONCLUSIONS: These results suggest a selective systemic microvascular vasoconstrictor abnormality in CADASIL in noradrenaline and angiotensin II pathways that is not explained by vasodilator impairment in endothelium or vascular smooth muscle. This could have important implications for prophylaxis and treatment of CADASIL.

Angiotensin II↗
PubMed2001

Cerebral microbleeds in CADASIL.

BACKGROUND: Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is a hereditary arteriopathy leading to recurrent cerebral infarcts and dementia. Intracerebral hemorrhage (ICH) has been described sporadically in patients with CADASIL, suggesting that the affected arteries in CADASIL are not bleed-prone. However, the presence of cerebral microbleeds, which often remain undetected on conventional MRI, has not been determined in CADASIL. OBJECTIVE: To determine whether cerebral vessels in patients with CADASIL are prone to microbleeding. METHODS: T2*-weighted gradient echo MRI, which is highly sensitive for visualizing microbleeds, was performed in patients with CADASIL and their family members (n = 63). Known risk factors for ICH were determined for all individuals. On an exploratory basis, the presence of cerebral microbleeds was correlated with demographic variables, vascular risk factors, disease progression, ischemic MR lesions, and genotype. RESULTS: Cerebral microbleeds were present in 31% of symptomatic CADASIL mutation carriers, predominantly in the thalamus. Vascular risk factors such as hypertension did not account for the microbleeds in these patients. Factors associated with microbleeds were age (p = 0.008), Rankin disability score (p = 0.017), antiplatelet use (p = 0.025), number of lacunae on MRI (p = 0.009), and the Arg153Cys Notch3 mutation (p = 0.017). After correction for age, only the Arg153Cys mutation remained significantly associated with the presence of microbleeds. CONCLUSION: Patients with CADASIL have an age-related increased risk of intracerebral microbleeds. This implies that they may have an increased risk for ICH, which should be taken into account in CADASIL diagnosis and patient management.

Adult↗
PubMed2004

Migraine with aura and brain magnetic resonance imaging abnormalities in patients with CADASIL.

BACKGROUND: Migraine with aura (MA) is one of the clinical hallmarks of CADASIL (cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy), a small vessel disease of the brain caused by mutations in the NOTCH3 gene, but its exact mechanisms are unknown. OBJECTIVES: To describe the patterns of MA in CADASIL and to compare brain magnetic resonance signal abnormalities between CADASIL patients with and without MA. DESIGN: Comparison of brain magnetic resonance signal abnormalities between cases and controls. SETTING: Patients with CADASIL seen at Lariboisière Hospital. PATIENTS: Forty-one CADASIL patients with MA and 31 age-matched CADASIL controls without MA. RESULTS: The mean age at onset of MA was significantly younger in women compared with men and occurred a mean of 15 years prior to stroke onset. A majority of patients (56%) reported at least 1 migraine attack with atypical aura. All CADASIL patients either with or without MA had white matter signal abnormalities on T2-weighted imaging. There was no difference in the frequency and distribution of brain signal abnormalities between CADASIL patients with and without MA. CONCLUSIONS: In CADASIL, MA is characterized by an unusually high frequency of attacks of migraine with atypical aura. The distribution and extent of magnetic resonance signal abnormalities did not differ according to migraine phenotype.

Adult↗
PubMed2001

Reduced cerebrovascular CO(2) reactivity in CADASIL: A transcranial Doppler sonography study.

BACKGROUND AND PURPOSE: Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukencephalopathy (CADASIL) is a hereditary angiopathy caused by mutations in Notch3. Cerebral microvessels show an accumulation of granular osmiophilic material in the vicinity of degenerating vascular smooth muscle cells. To study cerebrovascular function in CADASIL, we performed measurements on cerebral hemodynamics by using transcranial Doppler sonography. METHODS: Middle cerebral artery (MCA) mean blood flow velocity (MFV), cerebrovascular CO(2) reactivity, and the resistance index were measured by bilateral transcranial Doppler sonography in 29 CADASIL individuals (mean age, 49.0+/-2.4 years) and an equal number of age- and sex-matched control subjects. RESULTS: Compared with control subjects, CO(2) reactivity was reduced in CADASIL (33.4+/-2.7% versus 45.3+/-3.0%; P:<0.01). This difference remained significant when only nondisabled CADASIL individuals (Rankin=0, n=21) were included in the analysis (P:<0.05). CO(2) reactivity was significantly lower in disabled than in nondisabled CADASIL individuals (24.5+/-2.7% versus 36.8+/-3.4%; P:<0.05). MCA MFV was reduced in CADASIL (45.6+/-2.2 cm/s versus 54.2+/-2.4 cm/s; P:<0.05) and correlated negatively with age both in affected individuals (r=-0.314; P:<0.05) and control subjects (r=-0.339; P:<0.05). Resistance index was not significantly altered (59.0+/-1.0% versus 57.7+/-1.2%; P:=0.42). CONCLUSIONS: In CADASIL, there is a reduction of both CO(2) reactivity and basal MCA MFV. The reduced CO(2) reactivity suggests functional impairment of cerebral vasoreactivity probably related to vascular smooth muscle cell dysfunction. The reduction of CO(2) reactivity in nondisabled CADASIL individuals suggests an early role of impaired cerebral vasoreactivity in the evolution of the disease.

Adult↗
PubMed2004

The pathogenesis of CADASIL: an update.

Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) appears to be the most common form of hereditary stroke disorder. CADASIL is associated with arterial smooth muscle degeneration linked to mutations in the Notch3 gene, whose product is a transmembrane receptor that functions in cell-cell communication. The pathogenesis of CADASIL remains unclear. Current research efforts are directed towards the elucidation of various features of the disorder including investigations on CADASIL-like disorders, early cognitive changes, specificity of neuroimaging for diagnosis, discovery of de novo mutations, the development of Notch3 transgenic mouse models and molecular cellular studies in Notch3 signaling. The genetics of cerebrovascular disorders (CVD) was virtually unknown until recently. Genetic associations may have been evaded because of widely variable phenotypes, even within monogenic disorders such as CADASIL. Several investigators have attempted genotype-phenotype correlation in CADASIL cases but the relationship between genetic alterations and overt manifestation of phenotype remains elusive. However, the elucidation of the genetics and pathogenesis of CADASIL have been important in further understanding of the primary vascular mechanisms that lead to ischemic blood flow and its consequences on neuronal survival. This report summarizes some of the highlights of the satellite symposium on CADASIL at Vas-Cog 2003.

Animals↗
PubMed1995

Familial hemiplegic migraine and autosomal dominant arteriopathy with leukoencephalopathy (CADASIL).

Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is a recently described familial cerebrovascular disorder shown to map to chromosome 19q12. Familial hemiplegic migraine has also been shown in some families to map close to the CADASIL locus. The fully developed CADASIL phenotype consists of recurrent strokes developing in the fourth decade, progressing to a pseudobulbar palsy, spastic quadriparesis, and subcortical dementia. In an Irish family 15 members were fully investigated by magnetic resonance scanning; 10 had typical magnetic resonance features of CADASIL. Five members of this family had familial hemiplegic migraine and 4 of these had magnetic resonance evidence of CADASIL. Two other members had migraine with and without aura as a presenting clinical symptom of CADASIL. This disorder has been shown by linkage analysis to map to the CADASIL locus at chromosome 19. The phenotype at presentation of CADASIL in this family was variable and age related and included familial hemiplegic migraine, migraine with and without aura, transient ischemic attacks, strokes, and spinal cord infarction. This family study increases our understanding of the spectrum of clinical manifestations of this underrecognized familial cerebrovascular disorder.

Adult↗
PubMed2001

MRI hyperintensities of the temporal lobe and external capsule in patients with CADASIL.

BACKGROUND: Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is an inherited, autosomal dominant condition caused by mutations of the Notch3 gene. Affected individuals have migraine, mood disturbance, and recurrent strokes, often progressing to subcortical dementia and premature death. MRI findings include focal lacunar infarcts and diffuse T2-weighted hyperintensity, or leukoaraiosis. However, such findings are seen much more commonly in patients with cardiovascular risk factors, particularly hypertension, where they are believed to represent cerebral small vessel disease. No previous study has sought to identify specific radiologic markers of CADASIL. METHODS: MRI scans from 20 consecutive patients with CADASIL and 20 patients with sporadic leukoaraiosis due to presumed small-vessel disease were compared using the previously validated semiquantitative MRI rating scale devised by Scheltens et al. Analysis was blinded to clinical category. RESULTS: Scores for hyperintensities of the temporal white matter and external capsule-insula region were significantly higher in patients with CADASIL. Hyperintensity confined to the pole of the temporal lobe was a characteristic finding in CADASIL, occurring in 19 patients with CADASIL but no patients with ischemic leukoaraiosis. Involvement of the external capsule, though less specific, was seen early in the disease course. In a few patients with CADASIL, involvement of the corpus callosum was observed. CONCLUSIONS: Temporal pole hyperintensity is a radiologic marker of CADASIL. Involvement of the external capsule and corpus callosum are also characteristic findings that may help to distinguish the disease.

Adult↗
PubMed2000

Distribution of cranial MRI abnormalities in patients with symptomatic and subclinical CADASIL.

Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is a rare, inherited cause of early stroke and dementia, with a poor prognosis. This study was performed to clarify lesion appearance and pattern of lesion distribution in CADASIL. 20 members of a single family were tested for the CADASIL gene mutation and studied with cranial MRI. Scans were evaluated for lesion load and pattern of lesion distribution. 19 patients had cranial MRI, of whom 11 had normal MRI scans, were clinically unaffected and tested negative for the CADASIL gene mutation. The remaining eight patients had abnormal cranial MRI scans: seven patients were positive for the CADASIL gene mutation and one (untested) patient was severely clinically affected. Three of the patients who tested positive for the CADASIL gene mutation were clinically unaffected at the time of imaging. All eight patients with abnormal cranial MRI had subcortical white matter abnormalities, mostly in frontal and temporal lobes. Lesions involving the corpus callosum were present on sagittal T2 weighted images in four of five clinically affected and one of three clinically unaffected patients. Lesions involving the deep grey nuclei and the brain stem were common. On T1 weighted images, lesions were either poorly defined (confluent white matter hypointensity) or well defined (cystic infarcts or enlarged perivascular spaces). Atrophy was infrequent. Familiarity with the range of cranial MRI appearances may aid diagnosis of CADASIL. Recognition of cranial imaging features in asymptomatic CADASIL patients could prompt earlier diagnosis.

Adult↗
PubMed2000

[CADASIL: genetics and physiopathology].

CADASIL, an autosomal dominant adult onset arteriopathy causing stroke and dementia in humans, is underlaid by a non atherosclerotic non amyloid angiopathy involving mainly the media of small cerebral arteries; it is characterized by major lesions of vascular smooth muscle cells. Using a positional cloning approach, we mapped CADASIL locus on chromosome 19 and identified the mutated gene as being Notch3. This gene, previously unknown in humans, encodes for a large transmembrane receptor belonging to the Notch/lin12 gene family which are known to be involved in cell fate specification during development. Genetic analysis of more than 120 CADASIL unrelated families allowed us to show that these mutations are highly stereotyped and affect only the extra cellular domain of the protein. On the basis of these data, a molecular diagnostic test has been set up and is now widely required by clinicians involved in the diagnosis of vascular leukoencephalopathies. Using this test, we recently showed that CADASIL can also occur in patients who do not have any affected relative due to the existence of notch3 de novo mutations. As a first step to investigate the molecular and cellular mechanisms leading from Notch3 mutations to CADASIL phenotype, we analyzed by in-situ hybridization and immunohistochemistry the pattern of expression of this gene. Notch3 expression is highly restricted to the vascular smooth muscle cell in normal human adults. In CADASIL tissues there is a dramatic accumulation of the extracellular domain of the protein which suggests that one of the main mechanisms of CADASIL involves anomalies in the proteolytical cleavage and clearance of this protein. These data provide important clues to the mechanisms of this condition and current work should lead in the next future to a complete understanding of CADASIL and set up the basis of a rational therapeutical approach of this condition.

Dementia, Multi-Infarct↗
PubMed2005

The prevalence of cerebral autosomal dominant arteriopathy with subcortical infarcts and leucoencephalopathy (CADASIL) in the west of Scotland.

BACKGROUND: Cerebral autosomal dominant arteriopathy with subcortical infarcts and leucoencephalopathy (CADASIL) is caused by mutations of the Notch3 gene on 19p13. Varying phenotypic expression leads to under recognition and misdiagnosis. Prevalence therefore remains uncertain. We sought to estimate the prevalence of CADASIL in the west of Scotland. METHODS: A register for CADASIL was established at a regional neurosciences centre in 2002. All patients with genetically (exons 3, 4, 5, and 6) or histologically confirmed CADASIL residing in two defined administrative health areas were identified. Pedigree members at varying risk of carrying the mutation were also identified and the number of probable Notch3 mutation carriers in the defined population was predicted. Prevalence was calculated for definite CADASIL cases, with and without probable carrier numbers, based upon adult population figures from the 2002 national census. RESULTS: Twenty two individuals from seven pedigrees with confirmed CADASIL and resident in the defined geographical area were identified, yielding a prevalence of 1.98 (95% confidence interval 1.24-3.00) per 100 000 adults. An additional 37 individuals were predicted to be carriers of the Notch3 mutation, yielding a probable mutation prevalence of 4.14 (3.04-5.53) per 100,000 adults. CONCLUSIONS: The prevalence of genetically proven CADASIL was 1.98 per 100,000 adults in the defined population. This figure underestimates disease burden.

Adolescent↗
PubMed2002

CADASIL mimicking primary angiitis of the central nervous system.

BACKGROUND: Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) and primary angiitis of the central nervous system (PACNS) share several clinical and radiological features. However, digital subtraction angiogram (DSA) is generally reported as normal in CADASIL, whereas lumen irregularities in distal cerebral arteries indicate PACNS. OBJECTIVE: To describe a potential pitfall of DSA interpretation, which led to the tentative diagnosis of PACNS in a CADASIL patient. PATIENT AND METHODS: Single case observation. RESULTS: A 47-year-old man sustained recurrent subcortical infarcts. He had mild hypercholesterolemia and migraine. His family history was unremarkable. The underlying cause of stroke could not be elucidated. Transcranial Doppler sonography revealed decreased intracranial blood flow velocities compatible with CADASIL. Lumen irregularities of several peripheral intracranial arteries were seen on DSA, which suggested PACNS. CADASIL was confirmed by results from skin biopsy and genetic testing. CONCLUSIONS: First, in patients with CADASIL, DSA can show segmental lumen irregularities in distal cerebral arteries suggestive of PACNS. Second, the potential role of transcranial Doppler sonography to distinguish CADASIL from PACNS deserves further testing.

Central Nervous System Diseases↗
PubMed2002

Morphometric analysis of ultrastructural vascular changes in CADASIL: analysis of 50 skin biopsy specimens and pathogenic implications.

Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is a systemic vascular disease caused by Notch 3 gene mutations. On electron microscopy a specific granular osmiophilic material (GOM) is found surrounding the vascular smooth muscle cells. In 1993, we first proposed the use of skin biopsy to diagnose patients and to identify relatives of patients with CADASIL. We analyze here our experience with skin biopsies from 50 patients with CADASIL and compare the findings with those of 20 normal skin biopsy specimens. A morphometric analysis of skin vessel morphology on electron microscopy was performed by systematic measurements of several blood vessel diameters, as well as of areas of lumen, endothelial cell and smooth muscle cell cross-sectional areas, vessel wall area, arterial media and extracellular matrix areas. We found relative absence of stenosis but marked destruction of smooth muscle cells, resulting in decrease of vessel wall thickness and loss of extracellular matrix area, producing vessel wall weakness. Similar changes were also observed in brain arterioles from 5 patients with CADASIL. Our results suggest that hypotonicity of the arteriolar tree may constitute an important pathogenetic mechanism in CADASIL. Other than hypotonicity, the early and severe destruction of smooth muscle cells may potentially result in decreased secretion of vascular endothelial growth factor, loss of vascular permeability and damaging hemodynamic consequences. Blood vessel morphology of skin vessels correlated well with changes in brain arterioles. Vascular morphology in skin biopsy samples contributes to our understanding of the pathogenesis of CADASIL. It could be important to perform skin biopsies in future therapeutic trials of CADASIL as a direct measure of therapeutic effectiveness.

Adult↗