Veronika Borbélyová, MSc., PhD.
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1 Veronika Borbélyová, MSc., PhD.
2 History Eugen Bleuler autism (from the Greek words autos = self, ismus = orientation, status) the patient reduces the contact with the outside and he drifts into his own world (Bleuler, 1911)
3 Leo Kanner early infantile autism History the inability of the child to relate to people and objects in an appropriate manner lack of social relatedness = extreme autistic aloneness difficulties in adapting to changes in routines, the desire for sameness, impaired speech, limited spontaneous activity and abnormal reactions to some common stimuli from the environment (Kanner, 1943).
4 History Hans Asperger children with impaired social interaction, motor stereotypies and clumsiness, stereotyped interests and impaired communication well-developed language and high intelligence (Asperger, 1944)
5
6 Autism Spectrum Disorder (ASD)
7 Prevalence of autism spectrum disorder (ASD) Survaillance year (ADDM Network: ) Number of ADDM Sites Reporting Prevalence/ children This is about 1 in X children [year of publication] z 150 [2007] z 150 [2007] z 125 [2009] z 110 [2009] z 88 [2012] z 68 [2014] z 68 [2014] > Autism and Developmental Disabilities Monitoring (ADDM) Network
8 1 z 45
9 What is the exact cause of the higher rates of ASD? Still not clear different methodologies used across studies different screening and diagnostic instruments the ever-changing diagnostic criteria for the disorder the increased public awareness and increased availability of educational services inaccurate diagnoses geographical location (rural or urban area) variations in the size and type of the target population
10 How is ASD diagnosed? No medical test that can diagnose autism autism-specific behavioral evaluations - specially trained physicians and psychologists parents notice the first signs of unusual behaviors
11 How is ASD diagnosed? The most overt symptoms tend to emerge 6 months after birth However, some studies suggest that differences in development can be observed around 2 to 12 months of age red flags (signs that appear by 12 months of age in typically developing children) ICD-10 DSM-V
12
13 Screening tools CHAT (Checklist for Autism in Toddlers) M-CHAT (Modified Checklist for Autism in Toddlers) STAT (Screening Tool for Autism in Toddlers and Young Children) SCQ (Social Communication Questionnaire) ASSQ (Autism Spectrum Screening Questionnaire) CAST (Childhood Autism Spectrum Test)
14 ARCA (Academic Research Center for Autism) Prof. Ostatníková et al. Clinical Servis Education Research
15 Etiology The specific cause of ASD is still unknown Multifactorial disease : Psychological Environmental (non-genetic) Genetic
16 Psychological factors Theory of mind: expresses the ability to infer the mental states of other people by observing their behavior Theory of executive dysfunction: executive function - mechanisms that allow us to focus our attention and control impulsive reactions Weak central coherence theory: basic deficit in autistic children is the inability to integrate information into coherent or meaningful wholes
17 Psychological factors Empathizing-systemizing theory Measuring the strength of interest in empathy (E) Measuring the strength of interest in systems (S) 5 groups of people
18 Psychological factors Empathizing-systemizing theory Measuring the strength of interest in empathy (E) Measuring the strength of interest in systems (S) 5 groups of people S E
19 Sex differences in E and S (experience and socialization ) fetal testosterone (Baron-Cohen a kol., 2005) fetal testosterone concentration positively correlates with systemizing ability and negatively correlates with empathizing ability The extreme male brain theory : fetal testosterone concentrations autistic phenotype.
20
21 Environmental factors BEFORE CONCEPTION/PRENATAL RISK FACTORS: Parental age Maternal physical health (bleeding, and mother infection during pregnancy) Maternal mental health (depression, anxiety) Maternal prenatal medication use (valproate, thalidomide)
22
23 Environmental factors NATAL RISK FACTORS preterm (<35 weeks) and postterm pregnancy (>42 weeks bleeding during pregnancy fetal complications (umbilical-cord complications and cesarean delivery (26% increased risk of autism) hypoxia
24 Environmental factors POSTNATAL RISK FACTORS Low birth weight (<2500g) Jaundice Postnatal infection
25 Genetic factors ASD a gene-based disorder monozygotic twins (60-90%) dizygotic twins (10%) genetic research - to identify candidate genes of ASD the number of ASD-implicated genes: many of these genes are also associated with other neurodevelopmental disorders (epilepsy and schizophrenia)
26 Risk genes for ASD
27 Genetic syndromes associated with ASD Fragile X syndrome (FXS) Down syndrome (DS) Tuberous sclerosis Prader-Willi syndrome Angelman syndrome Neurofibromatosis Phenylketonuria
28 Syndromic and non-syndromic autism predominantly non-syndromic or idiopathic autism autism coincides with a genetic syndromes (FXS, DS etc.) - syndromic autism What differentiates individuals with syndromic autism from those with FXS or DS in isolation?
29 What differentiates individuals with syndromic autism from those with FXS or DS in isolation?
30 Animal models of autism 1. Animal models based on lesions in specific areas of the brain 2. Animal models based on modifications of the genome use either transgenic animals (mainly knockout mice) or spontaneous mutants 3. Microtine model Montane vole model
31
32
33
34
35 SHANK 3 gene SH3 and multiple ankyrin repeat domains 3 Cytogenetic Location: 22q13.33
36 SHANK 3 protein scaffold protein at excitatory synapses functioning of synapses (cell to cell communication) formation and maturation of dendritic spines (transmission of nerve impulses)
37 SHANK 3 and ASD ~ 43 SHANK3 gene mutations: 1. disruption of the function of the SHANK3 protein 2. prevention of the the protein production disruption in cell to cell communication ASD
38 SHANK proteins mice Encoded by SHANK1,2,3 genes Shank1 gene mouse chromosome 7B4 Shank2 gene mouse chromosome 7F5 Shank3 gene mouse chromosome 15E3
39
40 CNS expression SHANK1 cortex, thalamus, amygdala, hippocampus (CA1 and CA3), cerebellum SHANK2 cortex, thalamus, hippocampus (CA1 and CA3), dentate gyrus, cerebellum, (kidney and liver) SHANK3 heart, spleen, cortex, thalamus, striatum, hippocampus (more in CA3 than in CA1), dentate gyrus, cerebellum
41 SHANK3 isoforms expression in the brain
42 The link between SHANK genes and ASD ASD etiologically heterogenous mutations or disruptions in the SHANK gene family account for ~1% of all patients with ASD correlation between SHANK1 3 mutations and the degree of cognitive impairment difference in impairment severity - expression pattern of the mutated SHANK gene
43 Is autism reversible in adulthood? Shank3 conditional knock-in mouse model re-expression of the Shank3 gene in adult mice: improvements in synaptic protein composition, spine density and neural function in the striatum social interaction deficit and repetitive grooming behaviour were rescued anxiety and motor coordination deficit could not be recovered
44 3 HIT model 1. Genetic factor (Cntnap2-/-) 2. Environmental factor (LPS-MIA) 3. Sex (male mice) autism
45 Science at IMBM IMBM is not a standard research institute focusing on one molecule in one pathomechanism Different research background of people in our labs
46 ecdna The extracellular DNA (plasma) Measuring the activity of the enzyme that cleaves this DNA - deoxyribonuclease (DNase) The exogenous application of this enzyme is protective in sepsis, liver and kidney injury Any inflammation leads to an increase of extracellular DNA - IS activation We try to uncover the details of its role in sepsis, colitis and periodontitis in both, animal experiments and clinical studies
47
48
49 Inflammation and autism
50 Prenatal testosterone and autism
51 Metabolic syndrome
52 Steroid hormones
53 Acute and chronic kidney injury
54
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