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Items: 18

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.

Psychiatric

MedGen UID:
851585
Concept ID:
C1548428
Finding
4.

Behavioral abnormality

MedGen UID:
535345
Concept ID:
C0233514
Mental or Behavioral Dysfunction
5.

Dizygotic twins

MedGen UID:
67400
Concept ID:
C0220761
Finding
6.

Clinical finding

Clinical manifestations that can be either objective when observed by a physician, or subjective when perceived by the patient. [from MeSH]

MedGen UID:
19974
Concept ID:
C0037088
Sign or Symptom
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.

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
9.

Diagnosis, Psychiatric

MedGen UID:
138165
Concept ID:
C0376338
Mental or Behavioral Dysfunction
10.

Genetic predisposition

MedGen UID:
137259
Concept ID:
C0314657
Organism Attribute
11.

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
12.

Psychoses, Traumatic

MedGen UID:
19557
Concept ID:
C0033943
Mental or Behavioral Dysfunction
13.

Overinclusion

MedGen UID:
14542
Concept ID:
C0029947
Mental or Behavioral Dysfunction
14.

Mental disorder

MedGen UID:
14047
Concept ID:
C0004936
Mental or Behavioral Dysfunction
15.

Somatosensory Discrimination Disorder

MedGen UID:
199650
Concept ID:
C0751420
Mental or Behavioral Dysfunction
16.

Memory quantitative trait locus

MedGen UID:
816419
Concept ID:
C3810089
Finding
17.

Verbal memory - finding

MedGen UID:
709926
Concept ID:
C1287462
Finding
18.

Intelligence finding

MedGen UID:
670221
Concept ID:
C0589046
Finding
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