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Examination of the genetic factors underlying the cognitive variability associated with neurofibromatosis type 1.
Genetics in Medicine ( IF 6.6 ) Pub Date : 2020-02-04 , DOI: 10.1038/s41436-020-0752-2
Myrthe J Ottenhoff 1, 2, 3 , André B Rietman 3, 4 , Sabine E Mous 3, 4 , Ellen Plasschaert 5 , Daniela Gawehns 3, 4 , Hilde Brems 5 , Rianne Oostenbrink 2, 3 , , Rick van Minkelen 6 , Mark Nellist 6 , Elizabeth Schorry 7 , Eric Legius 5 , Henriette A Moll 2, 3 , Ype Elgersma 1, 3
Affiliation  

PURPOSE Neurofibromatosis type 1 (NF1) is an autosomal dominant disorder associated with cognitive deficits. The NF1 cognitive phenotype is generally considered to be highly variable, possibly due to the observed T2-weighted hyperintensities, loss of heterozygosity, NF1-specific genetic modifiers, or allelic imbalance. METHODS We investigated cognitive variability and assessed the contribution of genetic factors by performing a retrospective cohort study and a monozygotic twin case series. We included data of 497 children with genetically confirmed NF1 and an IQ assessment, including 12 monozygotic twin and 17 sibling sets. RESULTS Individuals carrying an NF1 chromosomal microdeletion showed significant lower full-scale IQ (FSIQ) scores than individuals carrying intragenic pathogenic NF1 variants. For the intragenic subgroup, the variability in cognitive ability and the correlation of IQ between monozygotic NF1 twin pairs or between NF1 siblings is similar to the general population. CONCLUSIONS The variance and heritability of IQ in individuals with NF1 are similar to that of the general population, and hence mostly driven by genetic background differences. The only factor that significantly attenuates IQ in NF1 individuals is the NF1 chromosomal microdeletion genotype. Implications for clinical management are that individuals with intragenic NF1 variants that score <1.5-2 SD below the mean of the NF1 population should be screened for additional causes of cognitive disability.

中文翻译:

检查与 1 型神经纤维瘤病相关的认知变异性的遗传因素。

目的 1 型神经纤维瘤病 (NF1) 是一种与认知缺陷相关的常染色体显性遗传疾病。NF1 认知表型通常被认为是高度可变的,可能是由于观察到的 T2 加权高信号、杂合性丧失、NF1 特异性遗传修饰物或等位基因失衡。方法 我们通过回顾性队列研究和同卵双胞胎病例系列研究认知变异性并评估遗传因素的贡献。我们纳入了 497 名经基因证实为 NF1 和 IQ 评估的儿童的数据,其中包括 12 对同卵双胞胎和 17 对兄弟姐妹。结果携带 NF1 染色体微缺失的个体显示出比携带基因内致病性 NF1 变体的个体显着降低的全面智商 (FSIQ) 分数。对于基因内亚组,同卵 NF1 双胞胎之间或 NF1 兄弟姐妹之间认知能力的变异性和智商的相关性与一般人群相似。结论 NF1 个体的智商变异和遗传力与普通人群相似,因此主要受遗传背景差异的驱动。显着降低 NF1 个体智商的唯一因素是 NF1 染色体微缺失基因型。对临床管理的影响是,基因内 NF1 变异的个体得分低于 NF1 人群的平均值 < 1.5-2 SD,应筛查认知障碍的其他原因。结论 NF1 个体的智商变异和遗传力与普通人群相似,因此主要受遗传背景差异的驱动。显着降低 NF1 个体智商的唯一因素是 NF1 染色体微缺失基因型。对临床管理的影响是,基因内 NF1 变异的个体得分低于 NF1 人群的平均值 < 1.5-2 SD,应筛查认知障碍的其他原因。结论 NF1 个体的智商变异和遗传力与普通人群相似,因此主要由遗传背景差异驱动。显着降低 NF1 个体智商的唯一因素是 NF1 染色体微缺失基因型。对临床管理的影响是,基因内 NF1 变异的个体得分低于 NF1 人群的平均值 < 1.5-2 SD,应筛查认知障碍的其他原因。
更新日期:2020-02-04
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