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CaV1.2 Calcium Channel Dysfunction Causes a Multisystem Disorder Including Arrhythmia and Autism
Open accessAbstract
Ca(V)1.2, the cardiac L-type calcium channel, is important for excitation and contraction of the heart. Its role in other tissues is unclear. Here we present Timothy syndrome, a novel disorder characterized by multiorgan dysfunction including lethal arrhythmias, webbing of fingers and toes, congenital heart disease, immune deficiency, intermittent hypoglycemia, cognitive abnormalities, and autism. In every case, Timothy syndrome results from the identical, de novo Ca(V)1.2 missense mutation G406R. Ca(V)1.2 is expressed in all affected tissues. Functional expression reveals that G406R produces maintained inward Ca(2+) currents by causing nearly complete loss of voltage-dependent channel inactivation. This likely induces intracellular Ca(2+) overload in multiple cell types. In the heart, prolonged Ca(2+) current delays cardiomyocyte repolarization and increases risk of arrhythmia, the ultimate cause of death in this disorder. These discoveries establish the importance of Ca(V)1.2 in human physiology and development and implicate Ca(2+) signaling in autism.
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“Further, there is clear evidence from Timothy syndrome (TS), a rare genetic disorder arising from mutation of either CACNA1C or CACNB2, that improper function of a Ca2+ channel can engender ASD with a penetrance as high as 60-80% (Breitenkamp et al., 2014; Splawski et al., 2005; Splawski et al., 2004).”
From Unifying Views of Autism Spectrum Disorders: A Consideration of Autoregulatory Feedback Loops (2016) · cites this paper as Splawski et al., 2004
In the citing paper
“Over 60% of TS patients also fulfill the criteria for an autism spectrum disorder (ASD)1 making TS one of the most penetrant monogenic forms of autism.”
From Using iPSC-derived neurons to uncover cellular phenotypes associated with Timothy syndrome (2011) · cites this paper as [1]
In the citing paper
“Timothy syndrome is caused by a missense mutation in the L-type calcium channel Cav1.2 that is associated with developmental delay and autism 1.”
From Using iPSC-derived neurons to uncover cellular phenotypes associated with Timothy syndrome (2011) · cites this paper as [1]
In the citing paper
“TS is caused by a point mutation in an alternatively spliced exon of CACNA1C, the gene that encodes the α1 subunit of Cav1.21.”
From Using iPSC-derived neurons to uncover cellular phenotypes associated with Timothy syndrome (2011) · cites this paper as [1]
In the citing paper
“This mutation leads to decreased calcium- and voltage-dependent inactivation of the channel1,9.”
From Using iPSC-derived neurons to uncover cellular phenotypes associated with Timothy syndrome (2011) · cites this paper as [1]
In the citing paper
“For example, mutations in the voltage-gated L-type calcium channels that flux calcium to initiate activity-dependent gene transcription are associated with Timothy syndrome, which is characterized by impairments in cardiac and immune function and has a significant association with ASD phenotypes31.”
From Activity-dependent neuronal signalling and autism spectrum disorder (2013) · cites this paper as [31]
In the citing paper
“Studies in mice indicate that this missense mutation leads to increased Ca2+ currents and loss of voltage-dependent channel inactivation31,77.”
From Activity-dependent neuronal signalling and autism spectrum disorder (2013) · cites this paper as [31]
In the citing paper
“Timothy syndrome, a disorder characterized by cardiac arrhythmia, congenital heart disease, immune deficiency, intermittent hypoglycaemia, global development delay and ASD, is caused by a missense mutation in CACNA1C31.”
From Activity-dependent neuronal signalling and autism spectrum disorder (2013) · cites this paper as [31]
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BackgroundSelf-citationGenome-wide association analysis identifies 13 new risk loci for schizophrenia
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Metadata
- Authors
- Splawski, I., Timothy, K. W., Sharpe, L. M., Decher, N., Kumar, P., Bloise, R., Napolitano, C., Schwartz, P. J., Joseph, R. M., Condouris, K., Tager-Flusberg, H., Priori, S. G., Sanguinetti, M. C., & Keating, M. T.
- Affiliations
- Howard Hughes Medical Institute (US)
- University of Utah (US)
- Istituti Clinici Scientifici Maugeri (IT)
- University of Pavia (IT)
- Boston University (US)
- Corresponding author
- Splawski, Igor
- ORCID
- Venue
- Cell
- Publisher
- Elsevier BV
- Published
- 2004-10
- Volume
- 119
- Issue
- 1
- Pages
- 19-31
- ISSN
- 0092-8674 (ISSN-L)
- OpenAlex
- W2138773108
- Cited by
- 1,586
- References
- 61
- Citations by year
- 2026: 34 · 2025: 48 · 2024: 64 · 2023: 49 · 2022: 76 · 2021: 66 · 2020: 80 · 2019: 70 · 2018: 90 · 2017: 92 · 2016: 73 · 2015: 85 · 2014: 66 · 2013: 114 · 2012: 98
- FWCI
- 41.47
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Cell (publishedVersion)
- PubMed (publishedVersion)
- INFM-OAR (INFN Catania) (submittedVersion, other-oa)
- Funders
- National Heart, Lung, and Blood Institute (HL46401, HL-52338, P50HL052338, T32HL007572)
- National Institute of Mental Health (MH66398, U54MH066398)
- National Institute on Deafness and Other Communication Disorders (DC03610)
- Topics
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genomics and Rare Diseases
- Keywords
- Cav1.2, cardiac L-type calcium channel, Timothy syndrome, de novo missense variant, cardiac arrhythmias, autism spectrum disorder, multisystem disease, congenital heart disease, immunodeficiency, hypoglycemia, intracellular calcium overload, calcium signaling, channel inactivation
- MeSH terms
- Abnormalities, Multiple, Action Potentials, Animals, Arrhythmias, Cardiac, Autistic Disorder, Brain, Brain Chemistry, Calcium, Cell Membrane, Child, Female, Cricetinae, Heart, Humans, Infant, Newborn, Male, Neurons, Oocytes, Pedigree, Syndrome, Xenopus laevis, CHO Cells, Limb Deformities, Congenital, Calcium Signaling, Mutation, Missense, Calcium Channels, L-Type, Genetic Diseases, Inborn, Myocytes, Cardiac, Mice
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