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Increased prevalence of seizures in boys who were probands with the FMR1 premutation and co-morbid autism spectrum disorder

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Abstract

Seizures are a common co-occurring condition in those with fragile X syndrome (FXS), and in those with idiopathic autism spectrum disorder (ASD). Seizures are also associated with ASD in those with FXS. However, little is known about the rate of seizures and how commonly these problems co-occur with ASD in boys with the FMR1 premutation. We, therefore, determined the prevalence of seizures and ASD in boys with the FMR1 premutation compared with their sibling counterparts and population prevalence estimates. Fifty premutation boys who presented as clinical probands (N = 25), or non-probands (identified by cascade testing after the proband was found) (N = 25), and 32 non-carrier controls were enrolled. History of seizures was documented and ASD was diagnosed by standardized measures followed by a team consensus of ASD diagnosis. Seizures (28%) and ASD (68%) were more prevalent in probands compared with non-probands (0 and 28%), controls (0 and 0%), and population estimates (1 and 1.7%). Seizures occurred more frequently in those with the premutation and co-morbid ASD particularly in probands compared with those with the premutation alone (25 vs. 3.85%, p = 0.045). Although cognitive and adaptive functioning in non-probands were similar to controls, non-probands were more likely to meet the diagnosis of ASD than controls (28 vs. 0%, p < 0.0001). In conclusion, seizures were relatively more common in premutation carriers who presented clinically as probands of the family and seizures were commonly associated with ASD in these boys. Therefore, boys with the premutation, particularly if they are probands should be assessed carefully for both ASD and seizures.

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Acknowledgments

We deeply thank all participants and families who participated in this study. This work was supported by National Institute of Health Grants HD036071, HD02274, DE019583, DA024854, AG032119, AG032115, MH77554; National Center for Resources UL1RR024146; Health and Human Services Administration of Developmental Disabilities Grant 90DD05969 and the Grant from King Chulalongkorn Memorial Hospital, The Thai Red Cross Society, Bangkok, Thailand (Dr. Chonchaiya).

Conflict of interest

Dr. Hagerman has received funding from Seaside Therapeutics, Novartis, Roche, Forest, Neuropharm, Johnson & Johnson, and Curemark for clinical trials, but these are unrelated to this study. She also consults with Novartis and Roche regarding clinical trials in fragile X syndrome unrelated to this study. Dr. Hessl has received funding from Novartis and Roche for clinical trials and consultation unrelated to this study. Other authors have indicated they have no financial relationships relevant to this article to disclose.

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Correspondence to Randi J. Hagerman.

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Chonchaiya, W., Au, J., Schneider, A. et al. Increased prevalence of seizures in boys who were probands with the FMR1 premutation and co-morbid autism spectrum disorder. Hum Genet 131, 581–589 (2012). https://doi.org/10.1007/s00439-011-1106-6

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