# DISC1 domain, vertebrates
The DISC1 domain structure in vertebrates refers to the organization of the Disrupted in [Schizophrenia](https://www.edgepedia.org/schizophrenia) 1 (DISC1) protein, an 854-amino-acid human scaffolding protein with a largely disordered N-terminal "head" domain (roughly residues 1–350) and a conserved C-terminal coiled-coil region (roughly residues 350–854) that contains UVR-like structural repeats.[1](https://pubs.acs.org/doi/10.1021/cn200062k) • [2](https://academic.oup.com/hmg/article-pdf/20/R2/R175/17254187/ddr374.pdf) The gene was first identified at the breakpoint of a t(1;11)(q42.1;q14.3) chromosomal translocation that segregates with schizophrenia and related psychiatric disorders in a large Scottish family, and it maps to chromosome 1q42.2 with 19 exons.[3](https://www.ncbi.nlm.nih.gov/gene/27185/)
| Key fact | Detail |
|---|---|
| Protein length and split | Human DISC1 is 854 amino acids: an N-terminal head (~1–350) with little secondary structure, and a C-terminal coiled-coil tail (~350–854) that is better conserved among orthologs[1](https://pubs.acs.org/doi/10.1021/cn200062k) |
| Repeats | Two to four sequence repeats occur in DISC1 orthologues; the first two resemble the UVR family of globular domains, each a pair of antiparallel α-helices rather than a coiled coil[2](https://academic.oup.com/hmg/article-pdf/20/R2/R175/17254187/ddr374.pdf) |
| Structural coverage | As of 2011 no full-length or fragment experimental 3-D structure existed; since a 2026 cryo-EM structure of the conserved core region was reported, the small DISC1-C domain is not the only structurally defined part of the protein[1](https://pubs.acs.org/doi/10.1021/cn200062k) • [4](https://www.nature.com/articles/s41467-026-71838-6) |
| Self-association | Residues 403–504 form a functional self-association domain demonstrated by pull-down experiments with deletion mutants in HEK293 cells[1](https://pubs.acs.org/doi/10.1021/cn200062k) |
| Evolutionary rate | Human and mouse DISC1 share ~50% amino acid identity over the first two exons, far below the 88% median for all genes[2](https://academic.oup.com/hmg/article-pdf/20/R2/R175/17254187/ddr374.pdf) |
| Phyletic distribution | DISC1 orthologues are predicted in amphioxus, sea anemone, amoebas, Trichoplax, plants, and algae, but the protein is absent from fungi, nematodes, and Diptera including fruit flies[2](https://academic.oup.com/hmg/article-pdf/20/R2/R175/17254187/ddr374.pdf) |
| Disease link | The gene is disrupted by the Scottish-family translocation; a frameshift after amino acid 807, an illness-related mutation, makes the C region form aberrantly multimeric, aggregated complexes[3](https://www.ncbi.nlm.nih.gov/gene/27185/) • [5](https://www.sciencedirect.com/science/article/pii/S0021925820365674) |
## Domain organization
Sequence analysis divides vertebrate DISC1 into two halves with sharply different characters. The N-terminal head domain shows poor evolutionary conservation except for two motifs, a nuclear localization signal (NLS) and a serine-phenylalanine-rich (SF-rich) motif, and it is predicted to be largely intrinsically disordered (lacks fixed 3-D shape; flexible chain binding many targets), a flexibility that may allow binding to multiple targets.[1](https://pubs.acs.org/doi/10.1021/cn200062k) • [6](https://pmc.ncbi.nlm.nih.gov/articles/PMC6046077/) The C-terminal tail is well conserved across species and predicted to be highly structured, a series of α-helices interspersed with at least four regions of strong coiled-coil-forming potential.[6](https://pmc.ncbi.nlm.nih.gov/articles/PMC6046077/) A later bioinformatics revision placed the N-terminal boundary at residue 326.[7](https://www.pure.ed.ac.uk/ws/portalfiles/portal/8266371/DISC1_Structure_Function_and_Therapeutic_Potential_for_Major_Mental_Illness.pdf)
Experimental domain mapping has been difficult because the full-length protein resists biophysical characterization. High-throughput ESPRIT screening, which assesses the solubility of tens of thousands of recombinant fragments, identified four novel folded regions proposed as the basic domain architecture of human DISC1.[5](https://www.sciencedirect.com/science/article/pii/S0021925820365674) Two of these regions (S and C) lie C-terminal to the Scottish-family translocation breakpoint and one (I) spans it, so any truncated or fusion protein made from the translocation chromosome would lack most of the major folded elements.[8](https://www.jbc.org/article/S0021925820365674/pdf) A independently characterized stable, soluble construct spans residues 691–836; SAXS showed it to be monomeric and extended, and the [Protein Data Bank](https://www.edgepedia.org/protein-data-bank) contained no structures with obvious sequence similarity to DISC1, precluding homology modeling.[9](https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0191162)
## UVR-like repeats
The clearest homology-based assignment in vertebrate DISC1 came from comparative genomics. Searches using conserved regions corresponding to human DISC1 amino acids 343–625 recovered significant matches to the UVR family, a globular domain of two antiparallel α-helices with a left-handed twist first recognized in the C-terminal region of UvrB.[2](https://academic.oup.com/hmg/article-pdf/20/R2/R175/17254187/ddr374.pdf) The analysis predicted between two and four repeats in DISC1 orthologues, with the first two showing significant sequence similarity to UVR domains; a later coevolution-based study identified three UVR-like repeats and confirmed the fold of the mouse third repeat experimentally (PDB 5YI4_A).[2](https://academic.oup.com/hmg/article-pdf/20/R2/R175/17254187/ddr374.pdf) • [10](https://pmc.ncbi.nlm.nih.gov/articles/PMC8527833/)
The repeats matter for disease genetics: the common missense variant L607F, associated with schizoaffective disorder in case-control studies, lies within the second UVR-like domain, and the risk variant S704C also falls in this region of the protein.[2](https://academic.oup.com/hmg/article-pdf/20/R2/R175/17254187/ddr374.pdf) • [4](https://www.nature.com/articles/s41467-026-71838-6)
## Quaternary structure
A 2026 cryo-EM study resolved a DISC1 core as a tetramer with a "bow tie" shape, assembled from two conserved UVR-type dimers joined at a two-fold symmetry axis. Within each protomer, the CC1 coiled-coil carries only two heptads on each helix, matching the size of a bona fide UVR domain, while CC3 contains many more heptads extending beyond a typical UVR motif and contributes to both dimer interfaces, making it a major stabilizing element of the fold. The authors describe DISC1 as a multivalent tetrameric hub built from conserved UVR dimers.[4](https://www.nature.com/articles/s41467-026-71838-6) This is consistent with earlier evidence that oligomerization is delicate and construct-dependent: depending on conditions and the C-terminal construct examined, truncated fragments can alter the oligomeric state of coiled-coil domains.[7](https://www.pure.ed.ac.uk/ws/portalfiles/portal/8266371/DISC1_Structure_Function_and_Therapeutic_Potential_for_Major_Mental_Illness.pdf)
## Binding sites mapped to domains
DISC1 acts as a molecular scaffold, with more than 200 reported interactors, many first found in yeast two-hybrid screens and later confirmed in mammalian cell lines or tissue lysates.[7](https://www.pure.ed.ac.uk/ws/portalfiles/portal/8266371/DISC1_Structure_Function_and_Therapeutic_Potential_for_Major_Mental_Illness.pdf) [Deletion mapping](https://www.edgepedia.org/deletion-mapping) assigns partners to specific segments:
- α-tubulin binds residues 181–357, with constructs 1–181, 358–598, and 598–854 noninteracting.[1](https://pubs.acs.org/doi/10.1021/cn200062k)
- Ndel1 (NUDEL), a protein involved in neuronal migration, binds the C-terminal segment 727–854.[11](https://www.sciencedirect.com/topics/medicine-and-dentistry/disrupted-in-schizophrenia-1-protein)
- APP interacts through the full-length and N-terminal constructs (1–854, 1–402, and the Lv, S, and Es splice isoforms), while the 403–854 construct does not interact.[1](https://pubs.acs.org/doi/10.1021/cn200062k)
- PDE4B contacts DISC1 at five sites, four of them in the head domain, one encompassing the conserved arginine-rich region and another the SF-rich region; that same arginine-rich region doubles as the NLS and is essential for binding TRAK1/2 and the 3′-UTR of [ITPR1](https://www.edgepedia.org/itpr1) mRNA.[6](https://pmc.ncbi.nlm.nih.gov/articles/PMC6046077/)
- Girdin (KIAA1212) has two reported contact sites on DISC1, one central (347–633) and one at the [C-terminus](https://www.edgepedia.org/c-terminus) (633–854), which partially explains contradictory published mappings.[1](https://pubs.acs.org/doi/10.1021/cn200062k)
Many binding partners, like DISC1 itself, contain or are predicted to contain coiled-coil domains, and homologous pairs of interactors such as NDE1/NDEL1 and PDE4B/PDE4D appear to possess both common and isoform-specific binding sites.[1](https://pubs.acs.org/doi/10.1021/cn200062k)
## Conservation and function across vertebrates
The DISC1 amino acid sequence evolves unusually fast, which long obscured its origins: besides the ~50% human-mouse identity over the first two exons, the 5′ exons are rich in serine, alanine, and glycine, a compositional bias that confounds homology detection, and the rest of the protein is dominated by predicted coiled coils.[2](https://academic.oup.com/hmg/article-pdf/20/R2/R175/17254187/ddr374.pdf) A comparison of human, mouse, pufferfish, and zebrafish loci found the order and orientation of [EGLN1](https://www.edgepedia.org/egln1), TSNAX, and DISC1 conserved between mammals and pufferfish, and alternate splice forms of DISC1 conserved even though the genomic structure is not; the specifically conserved features are a putative nuclear localization signal and discrete blocks of coiled coil.[12](https://pubmed.ncbi.nlm.nih.gov/12573262/)
Functional conservation extends to teleosts. In zebrafish, Disc1 is required for brain and body development, acting through β-catenin-mediated Wnt signaling and positively modulating the noncanonical Wnt pathway; conservation of zebrafish, mouse, and human Disc1 protein domains, and the interchangeability of these proteins, indicate that Disc1 engages similar pathways in teleosts and mammals.[13](https://pmc.ncbi.nlm.nih.gov/articles/PMC3236629/) In mammals, the protein is involved in neurite outgrowth and cortical development through its interactions with other proteins, and it is located in the nucleus, cytoplasm, and mitochondria.[3](https://www.ncbi.nlm.nih.gov/gene/27185/)
## Why the domain definition remains incomplete
The head domain shares no detectable homology with any known fold, and for years no experimental 3-D structure of any kind was available, leaving the effects of disease-linked missense mutations and SNPs on protein structure unexplained at the atomic level.[1](https://pubs.acs.org/doi/10.1021/cn200062k) The 2026 core structure covers only part of the protein, and the molecular architecture of the majority of DISC1, including the disordered [N-terminus](https://www.edgepedia.org/n-terminus) through which several partners bind, remains unresolved.[4](https://www.nature.com/articles/s41467-026-71838-6) Results from truncated constructs also carry a caveat, since fragments may report oligomerization sites or localization signals rather than true binding surfaces.[1](https://pubs.acs.org/doi/10.1021/cn200062k)
## References
1. [Soares DC, Carlyle BC, Bradshaw NJ, Porteous DJ (2011). DISC1: Structure, Function, and Therapeutic Potential for Major Mental Illness. ACS Chemical Neuroscience 2(11):609–632.](https://pubs.acs.org/doi/10.1021/cn200062k)
2. [Sanchez-Pulido L, Ponting CP (2011). Structure and evolutionary history of DISC1. Human Molecular Genetics 20(R2):R175–R181.](https://academic.oup.com/hmg/article-pdf/20/R2/R175/17254187/ddr374.pdf)
3. [DISC1 DISC1 scaffold protein [Homo sapiens], NCBI Gene.](https://www.ncbi.nlm.nih.gov/gene/27185/)
4. [The schizophrenia associated protein DISC1 forms a multivalent tetrameric hub via conserved UVR dimers. Nature Communications (2026).](https://www.nature.com/articles/s41467-026-71838-6)
5. [A structural organization for the Disrupted in Schizophrenia 1 protein, identified by high-throughput screening. Journal of Biological Chemistry 292(16):6468–6477 (2017).](https://www.sciencedirect.com/science/article/pii/S0021925820365674)
6. [Tropea et al. Mechanisms underlying the role of DISC1 in synaptic plasticity. The Journal of Physiology.](https://pmc.ncbi.nlm.nih.gov/articles/PMC6046077/)
7. [Soares et al., DISC1: Structure, Function, and Therapeutic Potential (publisher's PDF), University of Edinburgh Research Explorer.](https://www.pure.ed.ac.uk/ws/portalfiles/portal/8266371/DISC1_Structure_Function_and_Therapeutic_Potential_for_Major_Mental_Illness.pdf)
8. [A structural organization for the DISC1 protein (JBC PDF).](https://www.jbc.org/article/S0021925820365674/pdf)
9. [Biophysical insights from a single chain camelid antibody directed against DISC1. PLOS One (2018).](https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0191162)
10. [Extending the Horizon of Homology Detection with Coevolution-based Structure Prediction. PMC.](https://pmc.ncbi.nlm.nih.gov/articles/PMC8527833/)
11. [Disrupted in Schizophrenia 1 Protein, ScienceDirect Topics overview.](https://www.sciencedirect.com/topics/medicine-and-dentistry/disrupted-in-schizophrenia-1-protein)
12. [Evolutionary constraints on the Disrupted in Schizophrenia locus. PubMed.](https://pubmed.ncbi.nlm.nih.gov/12573262/)
13. [Disc1 regulates both β-catenin-mediated and noncanonical Wnt signaling during vertebrate embryogenesis. PMC.](https://pmc.ncbi.nlm.nih.gov/articles/PMC3236629/)
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*Topic: Encyclopedia › Life and health › Biological foundations › Biochemistry and metabolism › Protein families and complexes › Conserved protein domains and motifs › Structural and zinc-finger domains*
*Initially written Oct 21, 2026*
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