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1.

Schizophrenia

Schizophrenia is highly heritable, as shown by family, twin, and adoption studies. For example, for identical twins, if one twin develops schizophrenia, the other twin has about a 50% chance of also developing the disease. The risk of the general population developing the schizophrenia is about 0.3-0.7% worldwide. The search for “schizophrenia genes” has been elusive. Initial linkage studies looked at parts of the genome associated with schizophrenia, and many candidate genes were identified, including APOE, COMT, DAO, DRD1, DRD2, DRD4, DTNBP1, GABRB2, GRIN2B, HP, IL1B, MTHFR, PLXNA2, SLC6A4, TP53, and TPH1. However, some of these have later been questioned. Microdeletions and microduplications have been found to be three times more common in individuals with schizophrenia, compared to controls. Because these deletions and duplications are in genes that are overexpressed in pathways related to brain development, it is possible that the inheritance of multiple rare variants may contribute to the development of schizophrenia. Several genetic disorders feature schizophrenia as a clinical feature. The 22q11.2 Deletion Syndrome comprises many different syndromes, of which one of the most serious is DiGeorge syndrome. Children born with DiGeorge syndrome typically have heart defects, cleft palate, learning difficulties, and immune deficiency. Schizophrenia is a late manifestation, affecting around 30% of individuals. Microdeletions and duplications in chromosome 1, 2, 3, 7, 15 and 16 have also been associated with schizophrenia. In 2014, a genome-wide association study looked at the genomes of over 35,000 patients and 110,00 controls. The study identified 108 SNPs that were associated with schizophrenia, 83 of which had not been previously reported. As expected, many of these loci occurred in genes that are expressed in the brain. For example, the SNPs included a gene that encodes the dopamine D2 receptor, DRD2 (the target of antipsychotic drugs), and many genes involved in glutamine neurotransmitter pathways and synaptic plasticity (e.g., GRM3, GRIN2A, SRR, GRIA1). More surprisingly, however, associations were also enriched among genes expressed in tissues with important immune functions. In 2016, a study based on nearly 65,000 people investigated the association between schizophrenia and variation in the Major Histocompatibility Complex (MHC) locus—a region on chromosome 6 that is important for immune function. The study focused on the C4 gene (complement component 4) that exists as two distinct genes: C4A and C4B, which encode particularly structurally diverse alleles. The study found that the alleles which promoted greater expression of C4A in the brain were associated with a greater risk of schizophrenia. By using mice models, the study showed that C4 is involved in the elimination of synapses during brain maturation. In humans, “synaptic pruning” is most active during late adolescence, which coincides with the typical onset of symptoms of schizophrenia. It is therefore possible that the inheritance of specific C4A alleles could lead to “run away” synaptic pruning, increasing the risk of schizophrenia. Further research may even determine C4 as a potential therapeutic target. [from Medical Genetics Summaries]

MedGen UID:
48574
Concept ID:
C0036341
Mental or Behavioral Dysfunction
2.

Schizophrenia

MedGen UID:
506532
Concept ID:
CN117643
Finding
3.

Cognitive impairment

MedGen UID:
90932
Concept ID:
C0338656
Mental or Behavioral Dysfunction
4.

High risk

MedGen UID:
1389541
Concept ID:
C4319571
Finding
5.

High risk of

The potential future harm that may arise from some present action or attribute or condition is almost certain. [from NCI]

MedGen UID:
568174
Concept ID:
C0332167
Finding
6.

Abnormal

Deviating in any way from the state, position, structure, condition, behavior, or rule which is considered a norm. [from NCI]

MedGen UID:
59964
Concept ID:
C0205161
Finding
7.

Neurocognitive disorder

A disorder characterised by a decline primarily in intellectual function due to disease of the brain caused by a variety of acquired conditions such as cerebrovascular disease, Alzheimer's disease, infections, adverse drug reactions and trauma. [from SNOMEDCT_US]

MedGen UID:
873945
Concept ID:
C4041080
Mental or Behavioral Dysfunction
8.

Anosognosia

A condition in which a person who suffers illness or disability seems unaware of or denies the existence of the illness or disability. [from MeSH]

MedGen UID:
536043
Concept ID:
C0234507
Disease or Syndrome
9.

Schizophrenia Spectrum and Other Psychotic Disorders

Marked disorders of thought (delusions, hallucinations, or other thought disorder accompanied by disordered affect or behavior), and deterioration from a previous level of functioning. Individuals have one o more of the following symptoms: delusions, hallucinations, and disorganized speech. (from DSM-5) [from MeSH]

MedGen UID:
141907
Concept ID:
C0525046
Mental or Behavioral Dysfunction
10.

Diagnosis, Psychiatric

MedGen UID:
138165
Concept ID:
C0376338
Mental or Behavioral Dysfunction
11.

Genetic predisposition

MedGen UID:
137259
Concept ID:
C0314657
Organism Attribute
12.

Neurobehavioral Manifestations

Signs and symptoms of higher cortical dysfunction caused by organic conditions. These include certain behavioral alterations and impairments of skills involved in the acquisition, processing, and utilization of knowledge or information. [from MeSH]

MedGen UID:
105653
Concept ID:
C0525041
Sign or Symptom
13.

Risk factor

An aspect of personal behavior or lifestyle, environmental exposure, inborn or inherited characteristic, which, on the basis of epidemiological evidence, is known to be associated with a health-related condition considered important to prevent. [from MeSH]

MedGen UID:
48477
Concept ID:
C0035648
Finding
14.

Personality disorder

MedGen UID:
45827
Concept ID:
C0031212
Mental or Behavioral Dysfunction
15.

Perceptual Disorder

Cognitive disorders characterized by an impaired ability to perceive the nature of objects or concepts through use of the sense organs. These include spatial neglect syndromes, where an individual does not attend to visual, auditory, or sensory stimuli presented from one side of the body. [from MeSH]

MedGen UID:
45392
Concept ID:
C0030975
Mental or Behavioral Dysfunction
16.

Oxygen

An element with atomic symbol O, atomic number 8, and atomic weight 16. [from NCI]

MedGen UID:
45267
Concept ID:
C0030054
Biologically Active Substance; Element, Ion, or Isotope; Pharmacologic Substance
17.

Latent schizophrenia

MedGen UID:
44075
Concept ID:
C0023105
Mental or Behavioral Dysfunction
18.

Cognitive disorder

A category of psychiatric disorders which are characterized by a deficit in cognition or memory. [from NCI]

MedGen UID:
40371
Concept ID:
C0009241
Mental or Behavioral Dysfunction
19.

Schizotypal personality disorder

A disorder characterized by an enduring pattern of inability to establish close relationships coupled with cognitive or perceptual distortions, odd beliefs and speech, and eccentric behavior and appearance. [from NCI]

MedGen UID:
20666
Concept ID:
C0036363
Mental or Behavioral Dysfunction
20.

Borderline schizophrenia

MedGen UID:
20663
Concept ID:
C0036343
Mental or Behavioral Dysfunction
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