{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T15:10:17Z","timestamp":1789053017657,"version":"build-2803163510"},"reference-count":78,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2021,2,11]],"date-time":"2021-02-11T00:00:00Z","timestamp":1613001600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Genes"],"abstract":"<jats:p>Schizophrenia is a psychiatric disorder with a typical onset occurring during adolescence or young adulthood. The heterogeneity of the disorder complicates our understanding of the pathophysiology. Reduced cortical synaptic densities are commonly observed in schizophrenia and suggest a role for excessive synaptic elimination. A major pathway hypothesised to eliminate synapses during postnatal development is the complement system. This review provides an overview of genetic and functional evidence found for the individual players of the classical complement pathway. In addition, the consequences of the absence of complement proteins, in the form of complement protein deficiencies in humans, are taken into consideration. The collective data provide strong evidence for excessive pruning by the classical complement pathway, contributing to cognitive impairment in schizophrenia. In future studies, it will be important to assess the magnitude of the contribution of complement overactivity to the occurrence and prevalence of phenotypic features in schizophrenia. In addition, more insight is required for the exact mechanisms by which the complement system causes excessive pruning, such as the suggested involvement of microglial engulfment and degradation of synapses. Ultimately, this knowledge is a prerequisite for the development of therapeutic interventions for selective groups of schizophrenia patients.<\/jats:p>","DOI":"10.3390\/genes12020259","type":"journal-article","created":{"date-parts":[[2021,2,12]],"date-time":"2021-02-12T16:12:10Z","timestamp":1613146330000},"page":"259","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Schizophrenia: Complement Cleaning or Killing"],"prefix":"10.3390","volume":"12","author":[{"given":"Jirrine T.T.","family":"Hogenaar","sequence":"first","affiliation":[{"name":"Donders Institute for Brain, Cognition and Behaviour, Radboud university medical center, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hans","family":"van Bokhoven","sequence":"additional","affiliation":[{"name":"Donders Institute for Brain, Cognition and Behaviour, Radboud university medical center, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands"},{"name":"Department of Human Genetics, Radboud university medical center, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,2,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1187","DOI":"10.1001\/archpsyc.60.12.1187","article-title":"Schizophrenia as a complex trait: Evidence from a meta-analysis of twin studies","volume":"60","author":"Sullivan","year":"2003","journal-title":"Arch. Gen. Psychiatry"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Clouston, T.S. (1904). 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