DISC1

Disrupted in schizophrenia 1
Identifiers
Symbols	DISC1; C1orf136; FLJ13381; FLJ21640; FLJ25311; FLJ41105; KIAA0457; SCZD9
External IDs	OMIM: 605210 MGI: 2447658 HomoloGene: 10257 GeneCards: DISC1 Gene
Gene Ontology Molecular function • protein binding Cellular component • cytoplasm • centrosome • cytoskeleton • microtubule Biological process • microtubule cytoskeleton organization • neuron migration • positive regulation of neuroblast proliferation • multicellular organismal development • nervous system development • positive regulation of Wnt receptor signaling pathway Sources: Amigo / QuickGO
RNA expression pattern
More reference expression data
Orthologs
Species	Human	Mouse
Entrez	27185	244667
Ensembl	ENSG00000162946	ENSMUSG00000043051
UniProt	Q9NRI5	Q811T9
RefSeq (mRNA)	NM_001012957.1	NM_170596
RefSeq (protein)	NP_001012975.1	NP_733484
Location (UCSC)	Chr 1: 231.76 – 232.18 Mb	Chr 8: 127.55 – 127.82 Mb
PubMed search	[1]	[2]

Disrupted in schizophrenia 1 is a protein that is encoded by the DISC1 gene in humans.^[1] In coordination with a wide array of interacting partners, DISC1 has been shown to participate in the regulation of cell proliferation, differentiation, migration, neuronal axon and dendrite outgrowth, mitochondrial transport, fission and/or fusion, and cell-to-cell adhesion. Several studies have shown that unregulated expression or altered protein structure of DISC1 may predispose individuals to the development of schizophrenia, clinical depression, bipolar disorder, and other psychiatric conditions. The cellular functions that are disrupted by permutations in DISC1, which lead to the development of these disorders, have yet to be clearly defined and are the subject of current ongoing research.

Discovery

In 1970, researchers performing cytogenetic research on a group of juvenile offenders in Scotland found an abnormal translocation in chromosome 1 of one of the boys, who also displayed characteristics of an affective psychological disorder.^[2] After this initial observation, the boy's family was studied and it was found that 34 out of 77 family members displayed the same translocation. According to the Diagnostic and Statistical Manual of Mental Disorders (Fourth Edition) (or DSM-IV) criteria, sixteen of the 34 individuals identified as having the genetic mutation were diagnosed with psychiatric problems. In contrast, five of the 43 unaffected family members were identified to have psychological indispositions. The psychiatric illnesses observed in the family ranged from schizophrenia and major depression to bipolar disorder and adolescent conduct disorder (which the original research subject had).^[3] After studying this large Scottish family for four generations, in 2000, this gene was given the name "DISC1". The name was derived from the basis of the molecular nature of the mutation: the translocation directly disrupts the gene.^[1]

Importance of genetic studies

The implication of genetics in psychiatric illnesses is not unique to schizophrenia, though the heritability of schizophrenia has been calculated as high as 80%.^[4] The continued research of the family following the discovery of the translocation yielded statistical analysis of the probability of observing the simultaneous occurrence, or co-inheritance, of psychological afflictions and the translocation. This concept was measured quantitatively using the LOD, or logarithm of the odds value.^[5] The higher the LOD value, the stronger the correlation between the presence of the translocation and given disease(s) is thought to be. The LOD for the chromosome 1 translocation and identification of schizophrenia alone in the Scottish family was found to be 3.6.^[5] The LOD value of the translocation and a broader number of diagnoses (including schizophrenia, schizoaffective disorder, bipolar affective disorder, and recurrent major depression) was found to be 7.1.^[5]

Besides large familial-based studies in which the pedigrees of various family members are examined, twin studies have also been a source of support for researchers in the investigation of DISC1.^[4] In a meta-analysis of twin studies, twelve out of fourteen were found to support the fact that from a genetic perspective, schizophrenia is a complex trait that depends on both genetic and environmental factors.^[4] Such findings have encouraged researchers to continue with both macro-analysis of the disorders afflicting individuals with the mutation, as well as explore the micro-level.

Gene location and transcription

The DISC1 gene is situated at chromosome 1q42.1 and overlaps with DISC2 open reading frame. Multiple DISC1 isoforms have been identified at the RNA level, including a TSNAX-DISC1 transgene splice variant, and at the protein level.^[6] Of the isolated RNA isomers, 4 have been confirmed to be translated namely Long form (L), Long variant isoform (Lv), Small isoform (S), and Especially small isoform (Es). Human DISC1 is transcribed as two major splice variants, L form and Lv isoform. The L and Lv transcripts utilize distal and proximal splice sites, respectively, within exon 11. The L and Lv protein isoforms differ by only 22 amino acids within the C-terminus.^[7]

Alternate transcriptional splice variants, encoding different isoforms, have been characterized.^[8]

DISC1 homologues have been identified in all major vertebrate families including the common chimpanzee, the Rhesus monkey, the house mouse, the brown rat, zebrafish, pufferfish, cattle, and dogs; additionally homologue's have been described for invertebrate and plant phyla ^[9],^[10].

Protein structure and subcellular distribution

The protein encoded by this gene, is predicted to contain a coiled coil motif rich C-terminal domain and a N-terminal globular domain.^[9] The N-terminus contains two putative nuclear localization signals and a serine-phenylalanine-rich motif of unknown significance. The C-terminus contains multiple regions with coiled-coil forming potential and two leucine zippers that may mediate protein-protein interactions.

The protein locates to the nucleus, centrosome, cytoplasm, mitochondria, axons and synapses. Mitochondria are the predominant site of endogenous DISC1 expression, with at least two isoforms occupying internal mitochondrial locations. No known functional homologues exist for this protein in humans, although it does have broad homology to scaffold proteins. The DISC1 protein function appears to be highly diverse and its functional role in cellular processes is dependent upon the cellular domain it is located in. The presence or absence of certain protein interaction domains or targeting motifs may confer specific functions and influence sub cellular targeting, therefore it is probable that alternative splicing codetermines both the function and the intracellular location of DISC1.^[7]

Function

Many studies have provided insight into the normal function of the DISC1 protein, though much remains to be clearly defined. DISC1 is functionally involved in several processes that regulate neural development and brain maturation such as neuronal proliferation, differentiation, migration, cAMP signaling, cytoskeletal modulation, and translational regulation via various signaling pathways.^[11] Much of what is understood about the normal function of DISC1 has been uncovered through studies on zebrafish and mice as model organisms. In zebrafish, DISC1 is essential for forebrain development and GSK3/β-catenin signaling, while in mice the DISC1-GSK3 pathway regulates proliferation of neural progenitor cells in the cortex and adult dentate gyrus. This data suggests a direct DISC1 GSK3/β-catenin interaction.^[12]

DISC1 functions through a rich protein-protein interaction network, named the “DISC1 interactome” by researchers.^[12] Among its known interaction partners are 14-3-3ε, LIS1 and the PDE4B enzyme.^[13] DISC1 may play an important role in neuroplasticity via interactions with molecules of the cytoskeleton and centrosome, such as NUDEL and LIS1. The protein also enables the activity of dynein, a microtubule protein. Controlling transport of microtubules is involved in neuronal migration, neurite outgrowth, and axon formation.^[14]

DISC1 is highly expressed during critical periods of brain development, particularly in the embryonic ventricular and subventricular zones of the cortex, where neural progenitor cells are found. This localization suggests that DISC1 is an important regulator of embryonic and adult neurogenesis, and may regulate proliferation and/or differentiation. Levels of the protein in cycling neural progenitor cells affects whether they differentiate into neurons or remain as progenitors.^[12] Expression profile is highest in the hippocampus during development and remains highly expressed in the adult dentate gyrus and olfactory bulb, regions where adult neurogenesis is present.^[14] DISC1 has also been shown to regulate tempo of neuronal integration into the brain and guidance of positioning of new neurons.^[14]

Due to localization of the protein found at the synapse, DISC1 is also likely to play a key role in postsynaptic density, however this novel role is not yet fully understood.^[12]

Protein interactions

The DISC1 protein has no known enzymatic activity; rather it exerts its effect on multiple proteins through interactions to modulate their functional states and biological activities in time and space.^[15] These include:

DISC1

DISC1 has been shown to self-associate, to form dimers, multimers, and oligomers. The ability of DISC1 to form complexes with itself may be important in regulating its affinity for interacting partners such as NDEL1. In postmortem brain samples of Schizophrenia patients there is an increase in insoluble DISC1 oligomer aggregates, indicative of a common link with other neurological disorders characterised by protein agregation, namely Alzheimer's Disease, Parkinson's Disease, and Huntington's Disease.^[16][17]

ATF4/ATF5

ATF4 and ATF5 are members of the leucine zipper activating transcription factor / CREB family. They are known to bind to and regulate the function of GABA_B receptors in synapses and are involved in signal transduction from the cell membrane to the nucleus. Both proteins interact with DISC1 and GABA_B receptors via their second C-terminal leucine zipper domain, therefore DISC1 is able to regulate GABA_B receptor function through its interaction with ATF4/ATF5.^[15][18]

FEZ1

DISC1 participates in neurite outgrowth through its interaction with the fasciculation and elongation protein ζ-1 (FEZ1). FEZ1 is a mammalian homolog of the C. elegans UNC-76 protein involved in axonal outgrowth and fasciculation. The C-terminal region of FEZ1 (aa 247-392) is required for interaction with DISC1. A DISC1 region (aa 446-633), containing two stretches with coiled-coil-forming potential is critical for its interaction with FEZ1.^[19] DISC1-FEZ1 interaction is enhanced during neuro-differentiation, and expression of the FEZ1-binding domain of DISC1 has a dominant negative effect on neurite outgrowth, which implies co-operation of DISC1 and FEZ1 in this process.^[15]

Kalirin-7

The DISC1 protein plays a role in the process of regulating spine form and function through its interactions with kalirin-7 (kal-7). Kal-7 is a regulator of spine morphology and synaptic plasticity in association with neuronal activity. Kal-7-dependent regulation of spine formation occurs through its activity as a GDP/GTP exchange factor for Rac1. Activation of rac1 by kal-7 leads to increased spine size and synaptic strength through regulation of the actin cytoskeleton by rac1. DISC1 is able to bind to kal-7, confining its access to rac1, and in turn regulate spinal formation. Activation of NMDA receptors causes dissociation of DISC1 and kal-7, leaving kal-7 available to activate rac1.^[15][20]

MAP1A

DISC1 shows strong interaction with the microtubule-associated protein MAP1A that controls the polymerization and stabilization of microtubule networks in neurons, and thereby influence cell shape and intracellular transport of vesicles and organelles. MAP1A binds to the far N-terminus (aa 293-696) of DISC1, and the amino terminus of DISC1 binds to the LC2 subunit of MAP1A. The LC2 subunit of MAP1A contains an actin-binding domain and is necessary and sufficient for microtubule binding and polymerization, therefore DISC1 is able to regulate the ability of MAP1A to polymerize and stabilize microtubules and traffic proteins to their correct localization in the synaptic architecture.^[18]

NDEL1/NUDEL

DISC1 is localized to the centrosome, the primary microtubule organizing center of the cell, via interaction with nuclear distribution gene homologue-like 1 (NDEL1, also called NUDEL), where it is part of a protein complex involved in cytoskeletal processes of neuronal migration, including nucleokinesis and neurite outgrowth. NUDEL is also known to play a role in axon regeneration and has an additional DISC1-modulated function as a cysteine endopeptidase. Localization of NUDEL to axons is dependent on expression of DISC1.^[15] NUDEL binds to a 100 amino acid domain of DISC1 (aa 598-697) containing a coiled coil domain and a leucine zipper. The amino acid domain of NUDEL that binds DISC1 is the carboxyl terminal 100 amino acids of the protein (aa 241-345), which contains a cytoplasmic dynein binding site.^[18]

Other interactions include: ACTN2,^[18] CEP63,^[18] EIF3A,^[18] RANBP9,^[18] and SPTBN4.^[18]

Clinical implications

Aberrations of DISC1 are considered a generalized risk factor in major psychiatric diseases and have also been implicated in memory deficits and abnormal patterns of brain activity.^[11][21] DISC1 translocation increases the risk of developing schizophrenia, bipolar disorder, or major depression by about 50-fold in comparison to the general population.^[12] Efforts to model DISC1 disease biology in transgenic mice, Drosophila, and zebrafish have provided psychiatric disease implications related to DISC1 mutations.^[12] However, no specific variant is consistently associated with development of mental disorders, indicating allelic heterogeneity in psychiatric disease. The impact of variants in the DISC1 gene on expression and protein function is not yet clearly defined and associated variants are not necessarily causative.^[22]

Schizophrenia

Schizophrenia affects 1% of the general population and is highly heritable, providing an indication of a genetic basis.^[14] DISC1 has been associated with neurological abnormalities such as delusions, deficits in long term and working memory, diminution of gray matter volume in hippocampal and prefrontal regions.^[14] These abnormalities are also seen as symptoms of schizophrenia. As DISC1 function is involved in neurogenesis and neuroplasticity, vulnerability to schizophrenia may involve dysfunction in the hippocampus, a brain region in which adult neurogenesis occurs.^[14]

Autism and Asperger’s syndrome

In 2008, a genetic screen of 97 Finnish families affected by autism and Asperger’s syndrome revealed repeated DNA sequences within the DISC1 gene in those diagnosed with autism.^[21] Furthermore, a single nucleotide change in the gene was found to be present in 83% of family members with Asperger’s syndrome. A recent family study has reported a large chromosome 1 deletion that includes loss of DISC1 in a young boy diagnosed with autism. A link between DISC1 duplication and autism has also been suggested by the finding of a seven-gene duplication that includes DISC1 carried by two brothers with autism and mild retardation. These alterations in people with the disorder are rare, however, as none were found in a screening of 260 Belgians with autism.^[21]

Transgenic model organism strains generated with mutated or absent DISC1 suggest that the gene may contribute to at least some autistic abnormalities.^[21] Mice with lowered levels of DISC1 expression exhibit abnormal response to electrical stimulation, a decrease of dopamine synthesis, and an inability to filter unnecessary sensory information. Studies of expression of mutant DISC1 prenatally and postnatally have demonstrated varying effects, indicating the possibility that early postnatal expression of mutant DISC1 causes features of autism. Many more studies are necessary to confirm these suggestions.^[21]

Bipolar disorder

Linkage studies in extended families multiply affected with bipolar disorder also provide evidence for DISC1 as a genetic factor in the etiology of bipolar disorder.^[23] In 1998, a follow-up study was conducted of the large Scottish family in which DISC1 was first discovered. Additional family members with the original translocation who developed major psychotic illness, including bipolar disorder, were identified.^[23]

Research directions

As DISC1 investigation continues to be an emerging area of study, many unanswered questions regarding the biological function of the protein and its implications in psychiatric disorders remain. In depth understanding of DISC1 as a genetic risk factor for psychiatric disorders provides a possible target for developing new drug therapies and preventative measures.^[23] The pathways regulated by DISC1 interaction may provide possible avenues for therapeutic opportunities to reverse related deficits.^[12] Definitive genetic architecture, risk distribution, and their correlation with prognosis is crucial to determining response to new drug treatments.^[22]

In addition to DISC1, the antisense partner has been identified as DISC2, a noncoding RNA gene that may be involved in regulating the gene locus. However, structure and function of DISC2 remain unknown and may provide insight into how DISC1 is regulated.^[22]

Rare mutations in DISC1 other than the original translocation have been discovered and require further investigation.^[12] Furthermore, posttranslational processing and its effect on isoform expression, which also contributes to protein function and may be involved in some forms of disease, remains to be studied.^[12][22] The ability to predict the impact of different types of mutations on protein function and resulting psychiatric phenotype is crucial for the development of targeted treatments.^[22]

Family studies continue to provide an important approach towards deepening understanding of the biological nature of the gene and its clinical implications. While the original Scottish family in which DISC1 was discovered is still being considered, other familial populations in different countries have also become the focus of research in the past decade. In 2005, an American family was found to also possess a frameshift mutation in the DISC1 gene, which again co-segregated with schizophrenia and schizoaffective disorder.^[24] Characterized by a deletion of four base-pairs, the mutation was found in two siblings, one with schizophrenia and the other with schizoaffective disorder. Similar studies have also been done with Taiwanese and Finnish families.^[24]

See also

• Schizophrenia
• Bipolar disorder

References

1. ^ ^{a b} Millar JK, Wilson-Annan JC, Anderson S, Christie S, Taylor MS, Semple CA, Devon RS, Clair DM, Muir WJ, Blackwood DH, Porteous DJ (May 2000). "Disruption of two novel genes by a translocation co-segregating with schizophrenia". Hum. Mol. Genet. 9 (9): 1415–23. doi:10.1093/hmg/9.9.1415. PMID 10814723. 
2. ^ Blackwood DH, Fordyce A, Walker MT, et al. (2001). "Schizophrenia and affective disorders--cosegregation with a translocation at chromosome 1q42 that directly disrupts brain-expressed genes: clinical and P300 findings in a family.". Am. J. Hum. Genet. 69 (2): 428–33. doi:10.1086/321969. PMC 1235314. PMID 11443544. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1235314. 
3. ^ St Clair D, Blackwood D, Muir W, Carothers A, Walker M, Spowart G, Gosden C, Evans HJ. (1990). "Association within a family of a balanced autosomal translocation with major mental illness.". The Lancet. 336 (8706): 13–16. doi:10.1016/0140-6736(90)91520-K. PMID 1973210. 
4. ^ ^{a b c} Sullivan PF, Kendler KS, Neale MC (2003). "Schizophrenia as a complex trait: evidence from a meta-analysis of twin studies.". Arch. Gen. Psychiatry 60 (12): 1187–92. doi:10.1001/archpsyc.60.12.1187. PMID 14662550. 
5. ^ ^{a b c} Millar JK, James R, Brandon NJ, Thomson PA (2005). "DISC1 and DISC2: discovering and dissecting molecular mechanisms underlying psychiatric illness.". Ann. Med. 36 (5): 367–78. doi:10.1080/07853890410033603. PMID 15478311. 
6. ^ Nakata K, Lipska BK, Hyde TM, Ye T, Newburn EN, Morita Y, Vakkalanka R, Barenboim M, Sei Y, Weinberger DR, Kleinman JE (2009). "DISC1 splice variants are upregulated in schizophrenia and associated with risk polymorphisms". Proc Natl Acad Sci U S A. 106 (15): 15873–8. doi:10.1073/pnas.0903413106. PMID 19805229. 
7. ^ ^{a b} James R, Adams RR, Christie S, Buchanan SR, Porteous DJ, Millar JK (2004). "Disrupted in Schizophrenia 1 (DISC1) is a multicompartmentalized protein that predominantly localizes to mitochondria". Mol Cell Neurosci. 26 (1): 112–22. doi:10.1016/j.mcn.2004.01.013. PMID 15121183. 
8. ^ "Entrez Gene: DISC1 disrupted in schizophrenia 1". http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=27185. 
9. ^ ^{a b} Taylor MS, Devon RS, Millar JK, Porteous DJ (2003). "Evolutionary constraints on the Disrupted in Schizophrenia locus". Genomics 81 (1): 67–77. doi:10.1016/S0888-7543(02)00026-5. PMID 12573262. 
10. ^ Sanchez-Pulido L, Pontin CP (2011). "Structure and Evolutionary History of DISC1". Hum Mol Genet. 20 (R2): R175–81. doi:10.1093/hmg/ddr374. PMID 21852244. 
11. ^ ^{a b} Ina Weiner; Lubow, Robert E. (2010). Latent Inhibition: Neuroscience, Applications and Schizophrenia. Cambridge, UK: Cambridge University Press. ISBN 0-521-51733-8. 
12. ^ ^{a b c d e f g h i} Brandon NJ, Millar JK, Korth C, Sive H, Singh KK, Sawa A (October 2009). "Understanding the role of DISC1 in psychiatric disease and during normal development". J. Neurosci. 29 (41): 12768–75. doi:10.1523/JNEUROSCI.3355-09.2009. PMID 19828788. 
13. ^ Hennah W, Porteous D (2009). "The DISC1 pathway modulates expression of neurodevelopmental, synaptogenic and sensory perception genes". PLoS ONE 4 (3): e4906. doi:10.1371/journal.pone.0004906. PMC 2654149. PMID 19300510. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2654149. 
14. ^ ^{a b c d e f} Le Strat Y, Ramoz N, Gorwood P (May 2009). "The role of genes involved in neuroplasticity and neurogenesis in the observation of a gene-environment interaction (GxE) in schizophrenia". Curr. Mol. Med. 9 (4): 506–18. PMID 19519407. 
15. ^ ^{a b c d e} Bradshaw, NJ; Porteous, DJ (2010-12-31). "DISC1-binding proteins in neural development, signalling and schizophrenia.". Neuropharmacology. doi:10.1016/j.neuropharm.2010.12.027. PMID 21195721. 
16. ^ Leliveld SR, Bader V, Hendriks P, Prikulis I, Sajnani G, Requena JR, Korth C (April 2008). "Insolubility of disrupted-in-schizophrenia 1 disrupts oligomer-dependent interactions with nuclear distribution element 1 and is associated with sporadic mental disease.". J Neurosci 9 (28): 3839–45. doi:10.1523/​JNEUROSCI.5389-07.2008. PMID 18400883. 
17. ^ Leliveld SR, Hendriks P, Michel M, Sajnani G, Bader V, Trossbach S, Prikulis I, Hartmann R, Jonas E, Willbold D, Requena JR, Korth C (August 2009). "Oligomer assembly of the C-terminal DISC1 domain (640-854) is controlled by self-association motifs and disease-associated polymorphism S704C.". Biochemistry 48 (32): 7746–55. doi:10.1021/bi900901e. PMID 19583211. 
18. ^ ^{a b c d e f g h} Morris JA, Kandpal G, Ma L, Austin CP (July 2003). "DISC1 (Disrupted-In-Schizophrenia 1) is a centrosome-associated protein that interacts with MAP1A, MIPT3, ATF4/5 and NUDEL: regulation and loss of interaction with mutation". Hum. Mol. Genet. 12 (13): 1591–608. doi:10.1093/hmg/ddg162. PMID 12812986. 
19. ^ Miyoshi K, Honda A, Baba K, Taniguchi M, Oono K, Fujita T, Kuroda S, Katayama T, Tohyama M (July 2003). "Disrupted-In-Schizophrenia 1, a candidate gene for schizophrenia, participates in neurite outgrowth". Mol. Psychiatry 8 (7): 685–94. doi:10.1038/sj.mp.4001352. PMID 12874605. 
20. ^ Brandon, NJ; Millar, JK, Korth, C, Sive, H, Singh, KK, Sawa, A (2009-10-14). "Understanding the role of DISC1 in psychiatric disease and during normal development.". Journal of Neuroscience 29 (41): 12768–75. doi:10.1523/JNEUROSCI.3355-09.2009. PMID 19828788. 
21. ^ ^{a b c d e} "Clinical, animal studies probe DISC1's role in autism - Current Articles - Simons Foundation Autism Research Initiative (SFARI)". https://sfari.org/news/-/asset_publisher/6Tog/content/clinical-animal-studies-probe-disc1-s-role-in-autism?redirect=%2Fnews. 
22. ^ ^{a b c d e} Chubb JE, Bradshaw NJ, Soares DC, Porteous DJ, Millar JK (January 2008). "The DISC locus in psychiatric illness". Mol. Psychiatry 13 (1): 36–64. doi:10.1038/sj.mp.4002106. PMID 17912248. 
23. ^ ^{a b c} Blackwood DH, Visscher PM, Muir WJ (June 2001). "Genetic studies of bipolar affective disorder in large families". Br J Psychiatry Suppl 41: s134–6. PMID 11450173. 
24. ^ ^{a b} Sachs NA, Sawa A, Holmes SE, Ross CA, DeLisi LE, Margolis RL. (2005). "A frameshift mutation in Disrupted in Schizophrenia 1 in an American family with schizophrenia and schizoaffective disorder.". Mol Psychiatry 10 (8): 758–64. doi:10.1038/sj.mp.4001667. PMID 15940305. 

Further reading

• Blackwood DH, Muir WJ (2004). "Clinical phenotypes associated with DISC1, a candidate gene for schizophrenia.". Neurotoxicity research 6 (1): 35–41. doi:10.1007/BF03033294. PMID 15184103. 
• Porteous DJ, Thomson P, Brandon NJ, Millar JK (2006). "The genetics and biology of DISC1--an emerging role in psychosis and cognition.". Biol. Psychiatry 60 (2): 123–31. doi:10.1016/j.biopsych.2006.04.008. PMID 16843095. 
• Lipska BK, Mitkus SN, Mathew SV, et al. (2006). "Functional genomics in postmortem human brain: abnormalities in a DISC1 molecular pathway in schizophrenia.". Dialogues in clinical neuroscience 8 (3): 353–7. PMC 3181819. PMID 17117617. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3181819. 
• Seki N, Ohira M, Nagase T, et al. (1998). "Characterization of cDNA clones in size-fractionated cDNA libraries from human brain.". DNA Res. 4 (5): 345–9. doi:10.1093/dnares/4.5.345. PMID 9455484. 
• Millar JK, Wilson-Annan JC, Anderson S, et al. (2000). "Disruption of two novel genes by a translocation co-segregating with schizophrenia.". Hum. Mol. Genet. 9 (9): 1415–23. doi:10.1093/hmg/9.9.1415. PMID 10814723. 
• Ekelund J, Hovatta I, Parker A, et al. (2001). "Chromosome 1 loci in Finnish schizophrenia families.". Hum. Mol. Genet. 10 (15): 1611–7. doi:10.1093/hmg/10.15.1611. PMID 11468279. 
• Strausberg RL, Feingold EA, Grouse LH, et al. (2003). "Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences.". Proc. Natl. Acad. Sci. U.S.A. 99 (26): 16899–903. doi:10.1073/pnas.242603899. PMC 139241. PMID 12477932. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=139241. 
• Hennah W, Varilo T, Kestilä M, et al. (2004). "Haplotype transmission analysis provides evidence of association for DISC1 to schizophrenia and suggests sex-dependent effects.". Hum. Mol. Genet. 12 (23): 3151–9. doi:10.1093/hmg/ddg341. PMID 14532331. 
• Millar JK, Christie S, Porteous DJ (2004). "Yeast two-hybrid screens implicate DISC1 in brain development and function.". Biochem. Biophys. Res. Commun. 311 (4): 1019–25. doi:10.1016/j.bbrc.2003.10.101. PMID 14623284. 
• Ota T, Suzuki Y, Nishikawa T, et al. (2004). "Complete sequencing and characterization of 21,243 full-length human cDNAs.". Nat. Genet. 36 (1): 40–5. doi:10.1038/ng1285. PMID 14702039. 
• Brandon NJ, Handford EJ, Schurov I, et al. (2004). "Disrupted in Schizophrenia 1 and Nudel form a neurodevelopmentally regulated protein complex: implications for schizophrenia and other major neurological disorders.". Mol. Cell. Neurosci. 25 (1): 42–55. doi:10.1016/j.mcn.2003.09.009. PMID 14962739. 
• Miyoshi K, Asanuma M, Miyazaki I, et al. (2004). "DISC1 localizes to the centrosome by binding to kendrin.". Biochem. Biophys. Res. Commun. 317 (4): 1195–9. doi:10.1016/j.bbrc.2004.03.163. PMID 15094396.