The RELN gene provides instructions for making a protein called reelin. This protein is produced in the brain both before and after birth. Reelin is released by certain brain cells; then it attaches (binds) to specific receptor proteins. In the developing brain, this binding turns on (activates) a signaling pathway that triggers nerve cells (neurons) to migrate to their proper locations.
After birth, reelin likely plays a role in many brain processes, including the extension of axons and dendrites, which are specialized outgrowths from nerve cells that are essential for the transmission of nerve impulses. Reelin may also regulate synaptic plasticity, which is the ability of connections between neurons (synapses) to change and adapt over time in response to experience. Additionally, reelin controls the release of chemicals that relay signals in the nervous system (neurotransmitters).
Health Conditions Related to Genetic Changes
Lissencephaly with cerebellar hypoplasia
At least six mutations in the RELN gene have been found to cause lissencephaly with cerebellar hypoplasia (LCH). This condition affects brain development, resulting in the brain having a smooth appearance (lissencephaly) instead of its normal folds and grooves. In addition, the brain region involved in coordinating movements is unusually small and underdeveloped (cerebellar hypoplasia). The RELN gene mutations that cause LCH lead to a complete lack of reelin. As a result, the signaling pathway that triggers neuronal migration is not activated. Without reelin, neurons are disorganized, the normal folds and grooves of the brain do not form, and brain structures do not develop properly. This impairment of brain development leads to intellectual disability, delayed overall development, movement problems, and other signs and symptoms of LCH.More About This Health Condition
Autism spectrum disorder
MedlinePlus Genetics provides information about Autism spectrum disorderMore About This Health Condition
MedlinePlus Genetics provides information about Myoclonus-dystoniaMore About This Health Condition
Studies have shown certain variations (polymorphisms) in the RELN gene to be associated with an increased risk of psychiatric disorders such as schizophrenia and bipolar disease. Women with these polymorphisms are at particular risk of developing bipolar disease. In addition, certain genetic changes that result in a decrease in production of reelin (but not a complete absence) may be a risk factor for autism spectrum disorder, which affects communication and social interaction. However, other studies have not supported these findings. Many genetic and environmental factors are believed to contribute to these complex conditions.
Other Names for This Gene
Additional Information & Resources
Tests Listed in the Genetic Testing Registry
Scientific Articles on PubMed
Catalog of Genes and Diseases from OMIM
- Chang BS, Duzcan F, Kim S, Cinbis M, Aggarwal A, Apse KA, Ozdel O, Atmaca M, Zencir S, Bagci H, Walsh CA. The role of RELN in lissencephaly and neuropsychiatric disease. Am J Med Genet B Neuropsychiatr Genet. 2007 Jan 5;144B(1):58-63. Citation on PubMed
- Goes FS, Willour VL, Zandi PP, Belmonte PL, MacKinnon DF, Mondimore FM, Schweizer B; National Institute of Mental Health Genetics Initiative Bipolar Disorder Consortium, DePaulo JR Jr, Gershon ES, McMahon FJ, Potash JB. Sex-specific association of the Reelin gene with bipolar disorder. Am J Med Genet B Neuropsychiatr Genet. 2010 Mar 5;153B(2):549-553. doi: 10.1002/ajmg.b.31018. Citation on PubMed or Free article on PubMed Central
- Hong SE, Shugart YY, Huang DT, Shahwan SA, Grant PE, Hourihane JO, Martin ND, Walsh CA. Autosomal recessive lissencephaly with cerebellar hypoplasia is associated with human RELN mutations. Nat Genet. 2000 Sep;26(1):93-6. Erratum in: Nat Genet 2001 Feb;27(2):225. Citation on PubMed
- Lakatosova S, Ostatnikova D. Reelin and its complex involvement in brain development and function. Int J Biochem Cell Biol. 2012 Sep;44(9):1501-4. doi: 10.1016/j.biocel.2012.06.002. Epub 2012 Jun 15. Review. Citation on PubMed
- Wedenoja J, Tuulio-Henriksson A, Suvisaari J, Loukola A, Paunio T, Partonen T, Varilo T, Lönnqvist J, Peltonen L. Replication of association between working memory and Reelin, a potential modifier gene in schizophrenia. Biol Psychiatry. 2010 May 15;67(10):983-91. doi: 10.1016/j.biopsych.2009.09.026. Epub 2009 Nov 17. Citation on PubMed or Free article on PubMed Central
- Zaki M, Shehab M, El-Aleem AA, Abdel-Salam G, Koeller HB, Ilkin Y, Ross ME, Dobyns WB, Gleeson JG. Identification of a novel recessive RELN mutation using a homozygous balanced reciprocal translocation. Am J Med Genet A. 2007 May 1;143A(9):939-44. Citation on PubMed