The Cause of Autism: Its Footprint Tells. Autism Symposium-Part II
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1 The Cause of Autism: Its Footprint Tells Autism Symposium-Part II May 22, 2009 Nancy Minshew, MD Professor Psychiatry & Neurology University of Pittsburgh USA
2 Convergence The Top of 10 Clinical of 2007 With (cont d.) Anatomic 1. Spontaneous Mutations: Increased rate of de novo copy number variations: submicroscopic deletions or duplications of DNA sequences. More common in simplex than multiplex families. Opened door to two genetic mechanisms: inherited gene mutations and spontaneous copy number mutations- instability in replication of DNA 2. Potential reversal of Neurodevelopmental Disorders (in Fragile X, Rett & Angelman Syndromes) in adult mice
3 The Top 10 of 2007 (cont d.) Getting To A Neural Systems Perspective 1. Spontaneous Mutations: Increased rate of de novo copy Early number Brain variations: OverGrowth submicroscopic Shifts Thinking deletions or duplications of DNA sequences. More common in From Entrenched, Focal Brain Dysfunction Models simplex than multiplex families. Opened door to two genetic To Developmental mechanisms: inherited Neurobiologic gene mutations Model and spontaneous copy number mutations- instability in replication of DNA 2. Potential reversal of Neurodevelopmental Disorders (in Fragile X, Rett & Angelman Syndromes) in adult mice
4 Head Growth in Autism Lainhart et al. Am J Med Genet 2006, 140A: Group mean HC 60-70%; megalencephaly in 15% Onset accelerated growth 9-12 months w/ 15-20% macrocephaly by 4-5 years Growth decelerates and plateaus so that brain volume normalizes in childhood, though subset remain macrocephalic throughout life Important to recognize that HC>HT is not universal in autism and HC=HT and HC<HT growth trajectories also compatible with autism
5 Implications of Brain Volume Studies Major role for white matter but without accompanying long tract signs and thus the difference between acquired and devel. disorders Disturbance in connectivity Increased white matter volume associated with dysfunction, not increased function Inter-hemispheric white matter e.g. corpus callosum not involved in the same process Minshew & Williams, Arch Neurol 2007
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14 Brodman s Map & Connectivity Primary sensory & motor cortex Unimodal association cortex Heteromodal association cortex Intra- and inter-hemispheric connections
15 Minicolumn Abnormalities in Autism: Evidence of Cortical Involvement First substantive abnormalities of cerebral cortex Radially oriented arrays of pyramidal neurons, interneurons, axons and dendrites Smallest radial unit of information processing; then macrocolumns and receptive fields? Bilateral abnormalities in areas 3, 4, 9, 17, 21, 22 Increased #, narrower, reduced neuropil space (inhibitory neurons), neurons small Casanova et al. Acta Neuropathol 2006; 112:
16 Autism is a dysconnectivity syndromeboth increased & decreased connectivity.
17 Language Profile in HFA Superior to age-, IQ-, gender- matched controls on word & non-word decoding, spelling, vocabulary, fluency Inferior to controls on comprehension of sentences, idioms, metaphors, stories
18 Cortical activation & synchronization during sentence comprehension in HFA subjects Marcel Just Vlad Cherkassky Tim Keller Nancy Minshew Center for Cognitive Brain Imaging Carnegie Mellon Just et al. 2004, Brain 127:
19 Sentence reading task and comprehension probe Center for Cognitive Brain Imaging The player was followed by the parent Who was following? player parent
20 Brain activation during sentence comprehension in autism In Brain, 2004 Autism group has less activation in Broca s area (a sentence integration area) than the control group and more in Wernicke s area (a word processing area) Results are consistent with poorer comprehension of complex sentences, coupled with good word reading (spelling bee champs)
21 Example of less synchronized activation across two areas (upper panel, participant with autism) or more synchronized (lower panel, control participant) in comprehension task
22 Reliably lower functional connectivity for autism participants between pairs of key areas during sentence comprehension (red end of scale denotes lower connectivity)
23 Reliable differences in functional connectivity: autism group has lower functional connectivity but same rank order
24 Functional Underconnectivity: fmri of the Tower of London Marcel Just Nancy Minshew Tim Keller Vlad Cherkassky Rajesh Kana Just et al., 2006 [Epub ahead of print], Cereb Cortex
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26 Two systems-level characteristics of cortical function 1. It is always a set of cortical areas, not just one area, that activates in any thinking task, identifying the multiple neural centers involved
27 2. The activation is synchronized across subsets of participating areas (Broca s and DLPFC, in this example) Time Synchronization implies that the areas are collaborating and communicating with each other, and are not acting as independent agents Technical jargon: the measure of synchronization is referred to as functional connectivity
28 Other Brain Networks Affected in ASD: Innate Specialization Disturbed Theory of Mind Mirror Neuron Motion Processing (Gaze & Biologic Motion) Face Processing Emotion Processing Motivation, Incentive, Disincentive Language- left and right hemisphere Concept formation
29 R 0.30% 0.25% 0.20% Biological Non-biological psts Region psts Region 0.15% 0.10% 0.05% Robot Clock Mechanical Human Human 0.00% Autism Neurotypical What are the brain systems involved in representing the actions and intentions of other people? t > 5.2, p <.001 R 1.00% 0.80% 0.60% 0.40% 0.20% 0.00% MT/V5 MT/V5 Autism Biological Non-biological Neurotypical Pelphrey et al. (2003) Journal of Neuroscience Carter & Pelphrey (2007) Social Neuroscience
30 The Top 10 of 2007 (cont d.) Convergence Across Systems 1. Spontaneous At this point, Mutations: clear that Increased typical rate brain of de development novo copy number variations: submicroscopic deletions or results in pre-fab circuitry & systems that duplications of DNA sequences. More common in simplex predispose than human multiplex infant families. to automatically Opened door to orient two genetic and prefer mechanisms: human contact inherited over gene objects, mutations and spontaneous experience copy emotions number and mutations- perceive instability them in in others, replication acquire language, of DNA make sense of the world, play 2. Potential with toys reversal symbolically of Neurodevelopmental and with others. Disorders (in Fragile X, Rett & Angelman Syndromes) in adult mice
31 Neuronal Organization Joseph Volpe, Neonatal Neurology, 2008 Is autism a synapse-opathy?
32 Genetic Advances Increased rate of de novo copy number variations: submicroscopic deletions or duplications of DNA sequences. More common in simplex than multiplex families. instability in replication of DNA Potential reversal of Neurodevelopmental Disorders (in Fragile X, Rett & Angelman Syndromes) in adult mice; Proof of concept that delineating neurobiologic and genetic mechanisms would lead to treatment
33 Connecting The Top Anatomy 10 of 2007 to Genes (cont d.) & Back 1. Spontaneous PTEN conditional Mutations: knock-out Increased mice rate of display de novo copy number variations: submicroscopic deletions or enlarged brains and social behavioral deficits: duplications of DNA sequences. More common in PTEN simplex interacts than multiplex with families. several Opened proteins door in to a two signaling genetic mechanisms: cascade that inherited are tied gene to mutations tuberous and sclerosis spontaneous and copy neurofibromatosis. number mutations- instability 17% of in replication individuals of with DNAautism & macrocephaly had 2. Potential PTEN gene. reversal KO of mice Neurodevelopmental raises rescue possibilities. Disorders (in Fragile X, Rett & Angelman Syndromes) in adult mice
34 Connecting The Top Anatomy 10 of 2007 to Genes (cont d.) & Back Mouse models of genes associated with autism in 1. Spontaneous humans: neuroligin-3 Mutations: Increased gene mouse rate of model: de novo mouse copy has number deficits variations: in social submicroscopic behaviors deletions and an increased or ability duplications for spatial of DNA learning sequences. More common in simplex than multiplex families. Opened door to two genetic mechanisms: inherited gene mutations and spontaneous Discovery of copy rare number families mutations- with SHANK3 instability gene in mutations replication of added DNAfurther evidence to synaptic 2. dysfunction Potential reversal hypothesis. of Neurodevelopmental Codes for synapse Disorders formation (in & Fragile maintenance. X, Rett & It Angelman also interacts Syndromes) with neuroligins in adult mice and neurolexins.
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36 Next Phase of Advance: A Molecular Pathophysiology The role of the discovered genes has been defined at a cellular-molecular level to involve common interrelated signaling pathways that regulate development of brain connections. Emerging concept that two much (autism) and too little (Rett) connectivity both result in brain dysfunction. Cellular defects are discrete and disorder specific.
37 The Footprint is Visible: A Developmental Brain Disorder of Neuronal Organization The Loop From Clinical Syndrome to Genes is Completed: Widespread disturbance in integrative processing, neural systems development, and genes related to development of connectivity
38 So The What s Top 10 Really of 2007 Really (cont d.) New Machine learning analyses of language 1. Spontaneous representation Mutations: in the brain: Increased words rate of & de concepts novo copy number encoded variations: 5 ways-submicroscopic 5 attributes; this deletions enables or duplications generalization of DNA in typical sequences. brain More common in simplex than multiplex families. Opened door to two genetic mechanisms: inherited gene mutations and spontaneous Analyses of copy fmri number in face mutations- processing instability disorders in replication reveals it of is not DNAa focal brain function but a 2. Potential distributed reversal brain of function Neurodevelopmental Disorders (in Fragile X, Rett & Angelman Syndromes) in adult mice
39 So What s Really Really New: The Top 10 of 2007 (cont d.) 3 New Interventions Cognitive Enhancement Therapy: 18 months, 1. Spontaneous focuses cognitive, Mutations: Increased social, and rate emotional of de novo copy number function variations: and life submicroscopic skills deletions or duplications of DNA sequences. More common in simplex Multidimensional than multiplex information families. Opened integration: door to two genetic training mechanisms: a common inherited brain mechanism gene mutations needed and for a spontaneous wide range copy of abilities number mutations- instability in replication Using animals of DNA and related information to train 2. Potential face processing reversal of Neurodevelopmental Disorders (in Fragile X, Rett & Angelman Syndromes) in adult mice
40 Implications for Intervention Speak in sentences-think in words & or pictures Brain operates in systems, systems underconnected Local connections over-developed Key Qs: Does ABA develop local connections? Can new cognitive paradigms be designed to develop systems connections? Flexibility? Use cognition to boot strap behavior later Milieu to ingrain automatic good societal behavior
41 Clarification of Onset & Genetic For Public Many non-traumatic child neurologic disorders present out of the blue. They are divided by age groups, gray or white matter, and then regions. A recent example at CNS meeting-,neuronal ceroid lipofucshinosis, uniformly fatal, not responsive to bone marrow transplant, thus a candidate for stem cell therapy. Three forms: neonatal, infantile, juvenile. DNA as the day to day director of life; may come with faults with different decay rates-time bombs present from birth
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