Truncating mutations in NRXN2 and NRXN1 in autism spectrum disorders and schizophrenia.

Truncating mutations in NRXN2 and NRXN1 in autism spectrum disorders and schizophrenia.
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DOI:
10.1007/s00439-011-0975-z
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发表时间:
2011-10
期刊:
影响因子:
5.3
通讯作者:
Rouleau GA
Rouleau GA
中科院分区:
生物学2区
文献类型:
--
作者:
Gauthier J;Siddiqui TJ;Huashan P;Yokomaku D;Hamdan FF;Champagne N;Lapointe M;Spiegelman D;Noreau A;Lafrenière RG;Fathalli F;Joober R;Krebs MO;DeLisi LE;Mottron L;Fombonne E;Michaud JL;Drapeau P;Carbonetto S;Craig AM;Rouleau GA

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越来越多的遗传学证据倾向于支持自闭症谱系障碍(ASD)、智力残疾(ID,即智力发育迟缓)和精神分裂症(SCZ)存在共同的致病机制,这三种神经发育障碍会影响认知和行为。拷贝数变异以及包括NRXN1在内的突触组织蛋白的有害突变与这些神经发育障碍有关,但尚未有关于NRXN2或NRXN3的此类关联报道。通过对受ASD(n = 142)、SCZ(n = 143)或非综合征性ID(n = 94)影响的个体的三个神经连接蛋白基因进行重测序,我们在一名患有ASD的患者中发现了NRXN2的一个截断突变,该患者从有严重语言发育迟缓且有精神分裂症家族史的父亲那里遗传了此突变。我们还在一名精神分裂症患者中发现了NRXN1的一个新生截断突变,以及其他潜在的致病性ASD突变。这些截断突变导致蛋白质无法在神经元共培养中促进突触分化,并且在细胞结合试验中无法与已确定的两种突触后结合伴侣LRRTM2或NLGN2中的任何一种结合。我们的研究结果首次将NRXN2的破坏与ASD的发病机制联系起来,并进一步证实了NRXN1在精神分裂症中的作用,支持了这些疾病存在共同遗传机制的观点。
Growing genetic evidence is converging in favor of common pathogenic mechanisms for autism spectrum disorders (ASD), intellectual disability (ID or mental retardation) and schizophrenia (SCZ), three neurodevelopmental disorders affecting cognition and behavior. Copy number variations and deleterious mutations in synaptic organizing proteins including NRXN1 have been associated with these neurodevelopmental disorders, but no such associations have been reported for NRXN2 or NRXN3. From resequencing the three neurexin genes in individuals affected by ASD (n = 142), SCZ (n = 143) or non-syndromic ID (n = 94), we identified a truncating mutation in NRXN2 in a patient with ASD inherited from a father with severe language delay and family history of SCZ. We also identified a de novo truncating mutation in NRXN1 in a patient with SCZ, and other potential pathogenic ASD mutations. These truncating mutations result in proteins that fail to promote synaptic differentiation in neuron coculture and fail to bind either of the established postsynaptic binding partners LRRTM2 or NLGN2 in cell binding assays. Our findings link NRXN2 disruption to the pathogenesis of ASD for the first time and further strengthen the involvement of NRXN1 in SCZ, supporting the notion of a common genetic mechanism in these disorders.
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