Abstract
Methylation-specific (MS) multiplex ligation-dependent probe amplification (MLPA) at two differentially methylated regions (DMRs) at chromosome 11p15, H19-DMR and LIT1-DMR, and microsatellite analysis for uniparental disomy (UPD) at chromosome 7 or 11, have been recommended for the genetic diagnosis of the Beckwith–Wiedemann syndrome (BWS) and the Silver–Russell syndrome (SRS). In this study, the efficacy of the MS pyrosequencing method at H19-DMR and LIT1-DMR at 11p15 and SGCE-DMR at 7q21 was evaluated for the genetic diagnosis of BWS (n=18) and SRS (n=20) patients. Epigenetic alterations or UPD were detected in 83% of BWS and 50% of SRS individuals by MS-MLPA, but the detection rate increased to 95% of BWS and 70% of SRS by MS pyrosequencing. Thirteen BWS patients (72%) harbored loss-of-methylation (LOM) at LIT1-DMR and two patients (11%) harbored gain-of-methylation (GOM) at H19-DMR, whereas two patients (11%) had both LOM at LIT1-DMR and GOM at H19-DMR, reflecting paternal UPD 11. Thirteen SRS patients (65%) harbored LOM at H19-DMR, whereas one patient (5%) had GOM at SGCE-DMR, reflecting maternal UPD 7. Birth anthropometric profiles were significantly correlated to methylation scores at either H19-DMR or LIT1-DMR. In conclusion, MS pyrosequencing enhanced the detection rate of molecular defects in BWS and SRS. Moreover, it indicates that methylation status at 11p15.5 might have an important role in fetal growth.
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We appreciate the patients and families for their cooperation. This research was supported by a grant from the National Research Foundation of Korea, funded by the Ministry of Education, Science and Technology (grant number NRF-2011-0019674).
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Lee, B., Kim, GH., Oh, T. et al. Quantitative analysis of methylation status at 11p15 and 7q21 for the genetic diagnosis of Beckwith–Wiedemann syndrome and Silver–Russell syndrome. J Hum Genet 58, 604–610 (2013). https://doi.org/10.1038/jhg.2013.67
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DOI: https://doi.org/10.1038/jhg.2013.67
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