genomic and proyeomic markers in forensic psychiatry
TRANSCRIPT
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Genomic and Proteomic markers in Forensic Psychiatry
Adonis Sfera, MDWith input from Mario Mendez MD, PhD
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Outline
Genomic markers for fragile X syndrome Molloy v Meier - genomic markers in the
courtroom Neuro-moral network Myths and facts about genes Proteins – the building blocks of life
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Levels of brain organization
Neurobiology can be studied at two levels of organization:
-cellular (cell-cell or cell-ECM interactions) -molecular (molecular networks enmesh the entire CNS)
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From cellular to molecular level mid 1980sProtein mass spectrometryConfocal laser scanning microscopeMultiphoton microscope
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Cellular biomarkers
Cellular connectomics (neuroimaging and electrophysiology).*Human Connectome Project*Brain cells are organized in networks: neuronal, glial, neuronal-glial and complex cellular networks.
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Molecular biomarkers-Genomic markers-Proteomic markers
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2003- the holy grail of genetics
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Gene mining “gold rush”
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Genes – more questions than answers
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From the sovereignty of genes to the sovereignty of proteins
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Origami – the art of folding
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Misfolded proteins: neurodevelopmental and neurodegenerative diseases
HUNTINGTIN PROTEIN = Huntington’s
ALPHA-SYNNUCLEIN = Lewy body dementia, Parkinson’s
TAU = frontotemporal dementia
AMYLOID BETA PROTEIN = Alzheimer’s
PRION PROTEIN = Creutzfeld-Jacob
DISC 1 PROTEIN = Schizophrenia
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Fragile X syndrome-molecular level
FMR1 gene fragile X mental retardation 1 protein (FMRP)
CGG triplet repeat, is expanded in the FMR1 gene
misfolded FMRP
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Fragile X syndrome- cellular level
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Genetic markers in the courtroom
Some neurodevelopmental and neuropsychiatric conditions such as Fragile X syndrome, velo-cardio-facial syndrome or Huntington’s disease biological markers are accepted in court.
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Molloy v Meier-genomic markers and duty to warn Dr. Meier, a pediatrician, treated Mrs. Molloy's minor daughter for developmental delays.
Mrs. Molloy informed Dr. Meier that her half brother was mentally retarded.
Dr. Meier ordered chromosome testing on Mrs. Molloy's minor child.
She did not, however, recommend testing for Mrs. Molloy. Nor did the testing that she ordered specifically test for Fragile X syndrome. The results of the chromosome tests were negative.
Later, Mrs. Molloy gave birth to another child, who was similarly disabled as the sister.
Mrs. Molloy and the two children then underwent genetic testing, which identified all of them as carriers of the genetic mutation associated with Fragile X syndrome.
Mrs. Molloy sued Dr. Meier, alleging that she failed to properly order and interpret genetic testing, and that she failed to provide adequate genetic counseling to the parents.
The lawsuit further alleged that the parents would not have conceived another child had they known that their first child had Fragile X syndrome, and that the mother was a carrier.
The Minnesota Supreme Court ruled that "a physician's duty regarding genetic testing and diagnosis extends beyond the patient to biological relatives who foreseeably may be harmed by a breach of that duty."
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Talking about genomic markers…
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The neurobiology of morality
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The neurobiology of moral behavior
Humans have an innate moral sense based in a neuromoral network centered in the ventromedial prefrontal cortex and its connections including anterior insula (AI) and anterior cingulate cortex (ACC).
The neuromoral network works through moral emotions and moral drives, such as the avoidance of harm to others and the need for fairness and punishment of violators.
Disorders of this region, such as focal lesions or frontotemporal dementia, disturb personal, intrinsic moral emotions and decision-making.
Clinicians must recognize and manage “acquired sociopathy” and other dysmoral behaviors associated with disorders of the neuromoral network.
Patients with these disorders pose a special problem for forensic neuropsychiatry.
Mario F. Mendez, MD, PhD. The Neurobiology of Moral Behavior: Review and Neuropsychiatric Implications. CNS Spectr. 2009 November; 14(11): 608–620. PMCID: PMC3163302 NIHMSID: NIHMS296407
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A universal normative morality
Philosophers since pre-Socratic times have long pondered the existence of a universal normative morality in addition to the descriptive codes proposed by each society,
religion, or legal system.
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The neuro-moral network in higher mammals
.Studies with apes and other social animals describe moral emotions:
-empathy-gratitude-a sense of fairness-emotional reciprocation-consolation-group loyalty.
De Waal FB. How animals do business. Sci Am. 2005;292:54-61.
Haidt J. The emotional dog and its rational tail: A social intuitionist approach to moral judgment. Psychol Rev. 2001;108:814-834.
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Where is the moral brain? A neuro-moral neuronal network was
described consisting of right VMPFC and its connections to ACC and INS.
Mario F. Mendez, MD, PhD. The Neurobiology of Moral Behavior: Review and Neuropsychiatric Implications. CNS Spectr. 2009 November; 14(11): 608–620. PMCID: PMC3163302 NIHMSID: NIHMS296407
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Von Economo Neurons (VEN) The cells of empathy?
*Human: 82,855 *Gorilla: 16,710, *Chimpanzee: 1,808
Found in anterior insular cortex (AI) and anterior cingulate cortex (ACC)
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Where in the world is insula?
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Anterior Cingulate Cortex (ACC)
Santillo AF, Mårtensson J, Lindberg O, Nilsson M, et al. (2013) Diffusion Tensor Tractography versus Volumetric Imaging in the Diagnosis of Behavioral Variant Frontotemporal Dementia. PLoS ONE 8(7): e66932. doi:10.1371/journal.pone.0066932http://www.plosone.org/article/info:doi/10.1371/journal.pone.0066932
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The salience network of the brain
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Empathy and compassion The neuro-moral network processes: -moral emotions -moral drives-avoidance of harm to others -the need for fairness -punishment of violators.
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Disorders of the neuro-moral network
Focal lesions or frontotemporal dementia (FTD), disturb personal, intrinsic moral emotions and decision making
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Sociopathy Functional neuroimaging studies demonstrate
frontotemporal hypometabolism, hypoperfusion, or changes in spectroscopy in murderers pleading not guilty by reason of insanity and in violent psychiatric inpatients.
A reduction in prefrontal gray matter volume associated with reduced autonomic arousal in violent offenders.
The smaller the volume of prefrontal cortex, the greater the tendency towards sociopathic behavior in sociopaths.
Sapolsky RM. The frontal cortex and the criminal justice system. Philos Trans R Soc Lond B Biol Sci. 2004;359:1787-1796.Veit R, Flor H, Erb M, et al. Brain circuits involved in emotional learning in antisocial behavior and social phobia in humans. Neurosci Lett. 2002;328:233-236.
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Developmental and acquired sociopathy
.Sociopathy Antisocial personality disorder
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Developmental sociopathy-lack moral emotions, empathy, conscience, or remorse and guilt for their acts
-normal moral knowledge and reasoning.
-instrumental (cold-blooded and goal-directed) aggression with decreased sympathetic arousal.
-minimal alterations in heart rate, skin conductance, or respirations when they are subjected to fear, stressful or unpleasant pictures,
-reduced autonomic responses to the distress of others, as well as reduced recognition of sad and fearful expressions.
Tiihonen J, Rossi R, Laakso MP, et al. Brain anatomy of persistent violent offenders: more rather than less. Psychiatry Res. 2008;163:201-212.
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Genomic markers of developmental sociopathy
DRD2 contains two alleles A1 and A2. A1 allele is associated with involvement in acts of serious physical violence and aggression.
DRD4 located on chromosome 11 has a polymorphism in the 3rd exon consisting of 7-repeat allele associated with extreme violence and aggression.
5HTTLPR located on chromosome 17 has a polymorphism that contains low and high expressing alleles. The low expressing allele was associated with antisocial personality disorder.
COMPT located on chromosome 22, has a polymorphism consisting of a single nucleotide difference (methionine replaced by valine). Carriers of met allele display signs of violence and aggression including antisocial personality disorder.
MAOA has two polymorphisms low and high activity alleles. The low activity allele is associated with violence and aggression.
Christopher J Ferguson, Kevin M Beaver. Natural Born Killers: The Genetic Origins of Extreme Violence . Aggression and Violent Behavior Volume:14 Issue:5. September/October 2009 Pages:286 to 294
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Phineas Gage: aquired sociopathy
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Connectomics and Phineas Gage
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Frontotemporal dementia behavioral variant (bvFTD)
The second most common dementia Young onset (midlife) Behavioral changes usually misdiagnosed as
psychiatric d/o 20-50% of cases are hereditary 15% autosomal dominant TAU protein misfolded, but not amyloid beta protein VENs are specifically and selectively attacked
(reduced by an average of 74%)
John M. Allman, Nicole A. Tetreault, Atiya Y. Hakeem, Kebreten F. Manaye, Katerina Semendeferi, Joseph M. Erwin, Soyoung Park, Virginie Goubert, and Patrick R. Hof. The von Economo neurons in the frontoinsular and anterior cingulate cortex. ANNALS OF THE NEW YORK ACADEMY OF SCIENCES, ISSN 0077-8923
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FTD: acquired sociopathy
transgression of social norms including sociopathic behavior
loss of empathy or appreciation of the
feelings of others, disinhibited, compulsive acts
often commit criminal violations while retaining the ability to know moral rules and conventions.
Mario Mendez. The Unique Predisposition to Criminal Violations in Frontotemporal Dementia. J Am Acad Psychiatry Law. 2010; 38(3): 318–323. PMCID: PMC31395
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Signs and symptoms of bvFTD
Unsolicited sexual approach or touch
Traffic violations including “hit-and-run accidents
Physical assaults
Shoplifting
Deliberate non-payment of bills
Pedophilia
Indecent exposure in public
Urination in inappropriate public places
Stealing food
Eating food in grocery stores stalls
Breaking and entering into other’s homes
Mario Mendez. The Unique Predisposition to Criminal Violations in Frontotemporal Dementia. J Am Acad Psychiatry Law. 2010; 38(3): 318–323. PMCID: PMC31395
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Insula degeneration in bvFTD Insular atrophy is one of the earliest structural
biomarkers in behavioral variant FTD (bvFTD)
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Insular VEN degeneration in bvFTD
A cluster of dysmorphic right Insula VENs
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Why is this important for clinicians?
When patients present with dysmoral behavior for the first time, as a change from a prior pervasive pattern of behavior, clinicians need to consider a possible, causative brain disorder.
Family and friends need education as to the significance of the patient’s behavior, and the question of whether their dysmoral behavior is their “fault” may need frank discussion.
Medications can be useful in controlling related behaviors such as impulsivity, but do not selectively suppress dysmoral behavior.
Selective serotonin reuptake inhibitors, beta-blockers, and mood stabilizing antiepileptic agents (such as valproate, carbamazepine, and lamotrigine) could be of help in this regard.
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bvFTD and forensic psychiatry
Patients with FTD with disturbed volition have committed crimes and been arrested.
The US federal insanity defense hardens the original M’Naughton rule, requiring the defendant to prove, by “clear and convincing evidence,” that “at the time of the commission of the acts constituting the offense, the defendant, as a result of a severe mental disease or defect, was unable to appreciate the nature and quality or the wrongfulness of his acts” (18 U.S.C. § 17).
Without the restraint of intuitive moral emotions bvFTD patients may not be able to deter an impulse to act in an unacceptable manner, even as they know right and wrong and understand the nature of their acts.
These considerations demand a reappraisal of the how we view culpability and criminal violations among brain-injured patients.
Markowitsch HJ. Neuroscience and crime. Neurocase. 2008;14:1-6.
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Not Guilty by Reason of Brain Damage? Sapolsky (Phil Trans R Soc London B
2004; 359: 1787-1796) suggests that the insanity defense (not knowing right from wrong) should be expanded to consider impaired volition – diminished impulse control.
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Genomic markers of bvFTD
GGGGCC hexanucleotide repeat in the C9ORF72 gene in bvFTD and amyotrophic lateral sclerosis (ALS).
microtubule-associated protein tau (MAPT) gene
progranulin gene (GRN).
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Tauopathies - misfolded tau protein
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Axonal microtubules and tau protein
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Remembering the memory – quick reminder
Synapses or microtubules controversy
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Synaptic DarwinismWhere are memories stored?
Neurons that fire together wire together. Memory is attached to synapses (plasticity).
Donald Hebb 1949 “The Organization of Behavior”.
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Memory nano-machines
Electronic conductanceAccess to logic gates
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Quantum memory?
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Traditional computing vs. quantum computing (Bit vs. Qubit)
Bit 0 or 1
Qubit0 and 1
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Quick reminder of genomics and proteomics
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Genes are the blueprints of lifeProteins are the building blocks of life.
The blueprint of life confused with life itself
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Myths and facts about genes
BAD NEWS FIRST: genetics we all learned in college is not valid for the conditions we are treating and studying.
GOOD NEWS: forget genes, study proteins
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Rare vs. common diseases Rare diseases (mendelian
transmission) --cystic fibrosis, Huntington’s disease, muscular dystrophies, fragile X, etc.
Common diseases (non-mendelian transmission)--diabetes, asthma, obesity, coronary artery disease, most cancers, schizophrenia, bipolar d/o
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Myth # 1 We are different because our genes
are different
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Fact # 1 Two unrelated human beings share
99.9% of their genomic sequence, and could be considered almost genetically identical.
Variability 0.1%
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Myth # 2 All genes in our genome code for
proteins
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Fact # 2 -Only 1.1% to1.4% of the genome's
sequences code for proteins. -Human body contains over 100,000
proteins.
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Myth # 3 Genes are structural units.
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Fact # 3
Genes are functional units. Definition of a gene: A group of nucleotides
that code for one single protein. Genes can contain from 1,000 to more than
1.5 million nucleotides.
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Myth # 4
Identical twins always have identical proteins
Hum Mol Genet. 2011 Dec 15;20(24):4786-96. doi: 10.1093/hmg/ddr416. Epub 2011 Sep 9.Disease-associated epigenetic changes in monozygotic twins discordant for schizophrenia and bipolar disorder.Dempster EL, Pidsley R, Schalkwyk LC, Owens S, Georgiades A, Kane F, Kalidindi S, Picchioni M, Kravariti E, Toulopoulou T, Murray RM, Mill J.
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Fact # 4 Expression of genes may differ in identical
twins.
Identical twins convergent for schizophrenia 48%
ST6GALNAC1promoter on chromosome 17- different in identical twins discordant for schizophrenia.
Dempster EL, Pidsley R, Schalkwyk LC, Owens S, Georgiades A, Kane F, Kalidindi S, Picchioni M, Kravariti E, Toulopoulou T, Murray RM, Mill J. Disease-associated epigenetic changes in monozygotic twins discordant for schizophrenia and bipolar disorder. Hum Mol Genet. 2011 Dec 15;20(24):4786-96. doi: 10.1093/hmg/ddr416. Epub 2011 Sep 9.
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Proteins – conformational dynamics
Humans have 23,000 genes 1.1% to1.4% code for proteins Over 100,000 proteins in human body
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Biomarkers: Ethical considerations Genetic variants predisposing to diseases or predicting drug
response may have medico-legal implications (ex, access to genetic data by employers and insurance companies may lead to discrimination of individuals with an unfavorable genetic constitution or who would only tolerate expensive drugs (Koo, 2006)(Vijverberg, 2010).
The Genetic Information Nondiscrimination Act (GINA) was passed into law on 21 May 2008. However, genetic non-discrimination laws only provide the illusion of protection against potential risks of discrimination (Van Hoyweghen, 2008).
A study reviewed the definitions of genetic testing used by 65 organizations and entities throughout North America and Europe, such as genetics professional organizations, insurance companies, pharmaceutical companies, legal firms, and found extreme variability (Sequeiros, 2005).