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Phenotypic expansion of CACNA1C-associated disorders to include isolated neurological manifestationsKurata, Harley T.; Jamra, Rami Abou; Alkelai, Anna; Antonarakis, Stylianos E.; Bolkier, Yoav; Dickson, Patricia; Donald, Kirsten A.; Eliyahu, Aviva; Emrick, Lisa; Odent, Sylvie; Ortiz-Gonzalez, Xilma; Rosenfeld, Jill A.; Skraban, Cara; Alejandro, Mercedes E.; Azamian, Mahshid S.; Chao, Hsiao-Tuan; Dai, Hongzheng; Dhar, Shweta U.; Karaviti, Lefkothea; Lee, Brendan H.; Rosenfeld, Jill A.; Scott, Daryl A.; Wangler, Michael F.; Eng, Christine M.; Sullivan, Kathleen; Goldstein, David B.; McConkie-Rosell, Allyn; Schoch, Kelly; Shashi, Vandana; Beggs, Alan H.; Cobban, Laurel A.; Cooper, Cynthia M.; Fieg, Elizabeth L.; Korrick, Susan; Loscalzo, Joseph; Maas, Richard L.; MacRae, Calum A.; Stoler, Joan M.; Nagy, Anna; Dasari, Surendra; Lanpher, Brendan C.; Bivona, Stephanie; Isasi, Rosario; Levitt, Roy; Tekin, Mustafa; Thorson, Willa; Eckstein, David J.; Mamounas, Laura A.; D’Souza, Precilla; Ferreira, Carlos; Godfrey, Rena A.; Groden, Catherine A.; Macnamara, Ellen F.; Maduro, Valerie V.; Nath, Avi; Baker, Eva; Power, Bradley; Mosbrook-Davis, Deborah; Rossignol, Francis; Yousef, Muhammad; Amendola, Laura; Bamshad, Michael; Beck, Anita; Bennett, Jimmy; Blue, Elizabeth; Chanprasert, Sirisak; Glass, Ian; Jarvik, Gail P.; Jarvik, Jeffrey; Mefford, Heather; Merritt, J. Lawrence; Raskind, Wendy; Sybert, Virginia; Wener, Mark; Wenger, Tara; Fisher, Paul G.; Reuter, Chloe M.; Smith, Kevin S.; Zastrow, Diane B.; Nakano-Okuno, Mariko; Whitlock, Jordan; Butte, Manish J.; Fogel, Brent L.; Krakow, Deborah; Lee, Hane; Palmer, Christina G.S.; Papp, Jeanette C.; Woods, Jeremy D.; Andrews, Ashley; Pace, Laura; Viskochil, Dave; Bican, Anna; Kennedy, Jennifer; Cogan, Joy D.; Cole, F. Sessions; Kiley, Dana; Sisco, Kathy; Schedl, Timothy; Solnica-Krezel, Lilianna; Pitt, Geoffrey S.
Genetics in medicine, 10/2021, Letnik: 23, Številka: 10Journal Article
CACNA1C encodes the alpha-1-subunit of a voltage-dependent L-type calcium channel expressed in human heart and brain. Heterozygous variants in CACNA1C have previously been reported in association with Timothy syndrome and long QT syndrome. Several case reports have suggested that CACNA1C variation may also be associated with a primarily neurological phenotype. We describe 25 individuals from 22 families with heterozygous variants in CACNA1C, who present with predominantly neurological manifestations. Fourteen individuals have de novo, nontruncating variants and present variably with developmental delays, intellectual disability, autism, hypotonia, ataxia, and epilepsy. Functional studies of a subgroup of missense variants via patch clamp experiments demonstrated differential effects on channel function in vitro, including loss of function (p.Leu1408Val), neutral effect (p.Leu614Arg), and gain of function (p.Leu657Phe, p.Leu614Pro). The remaining 11 individuals from eight families have truncating variants in CACNA1C. The majority of these individuals have expressive language deficits, and half have autism. We expand the phenotype associated with CACNA1C variants to include neurodevelopmental abnormalities and epilepsy, in the absence of classic features of Timothy syndrome or long QT syndrome.
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