Cadm1-expressing synapses on Purkinje cell dendrites are involved in mouse ultrasonic vocalization activity.

Cadm1-expressing synapses on Purkinje cell dendrites are involved in mouse ultrasonic vocalization activity.
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DOI:
10.1371/journal.pone.0030151
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Momoi T
Momoi T
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Fujita E;Tanabe Y;Imhof BA;Momoi MY;Momoi T

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携带与人类言语障碍相关的突变的 Foxp2(R552H) 敲入 (KI) 小鼠幼崽表现出小脑浦肯野细胞发育不良和超声发声 (USV) 受损,超声发声是母子互动的交流工具。因此,人类语言和小鼠 USV 似乎在小脑中具有 Foxp2 介导的共同分子基础。在言语和语言障碍的自闭症谱系障碍 (ASD) 患者中,已发现编码突触粘附分子 CADM1 (RA175/Necl2/SynCAM1/Cadm1) 的基因发生突变。在本研究中,我们发现 Cadm1 缺陷型敲除 (KO) 幼崽和 Foxp2(R552H) KI 幼崽均表现出 USV 受损和小脑变小。在野生型幼鼠的分子层中,Cadm1优先定位于浦肯野细胞树突状乔木的顶端-远端部分,而Cadm1 KO小鼠小脑中的VGluT1水平降低。此外,我们在 Foxp2(R552H) KI 幼崽中浦肯野细胞发育不良的树突上检测到 Cadm1 和 VGluT1 的免疫反应性降低。然而,Cadm1 mRNA 表达在 Foxp2(R552H) KI 幼崽中没有改变。这些结果表明,尽管 Foxp2 转录因子不靶向 Cadm1,但浦肯野细胞和平行纤维突触处的 Cadm1 对于 USV 功能是必需的。浦肯野细胞树突上表达 Cadm1 的突触丢失可能与 Cadm1 KO 和 Foxp2(R552H) KI 小鼠表现出的 USV 损伤有关。
Foxp2(R552H) knock-in (KI) mouse pups with a mutation related to human speech–language disorders exhibit poor development of cerebellar Purkinje cells and impaired ultrasonic vocalization (USV), a communication tool for mother-offspring interactions. Thus, human speech and mouse USV appear to have a Foxp2-mediated common molecular basis in the cerebellum. Mutations in the gene encoding the synaptic adhesion molecule CADM1 (RA175/Necl2/SynCAM1/Cadm1) have been identified in people with autism spectrum disorder (ASD) who have impaired speech and language. In the present study, we show that both Cadm1-deficient knockout (KO) pups and Foxp2(R552H) KI pups exhibit impaired USV and smaller cerebellums. Cadm1 was preferentially localized to the apical–distal portion of the dendritic arbor of Purkinje cells in the molecular layer of wild-type pups, and VGluT1 level decreased in the cerebellum of Cadm1 KO mice. In addition, we detected reduced immunoreactivity of Cadm1 and VGluT1 on the poorly developed dendritic arbor of Purkinje cells in the Foxp2(R552H) KI pups. However, Cadm1 mRNA expression was not altered in the Foxp2(R552H) KI pups. These results suggest that although the Foxp2 transcription factor does not target Cadm1, Cadm1 at the synapses of Purkinje cells and parallel fibers is necessary for USV function. The loss of Cadm1-expressing synapses on the dendrites of Purkinje cells may be associated with the USV impairment that Cadm1 KO and Foxp2(R552H) KI mice exhibit.
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