Pleiotropic and isoform-specific functions for Pitx2 in superior colliculus and hypothalamic neuronal development.

Pleiotropic and isoform-specific functions for Pitx2 in superior colliculus and hypothalamic neuronal development.
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DOI:
10.1016/j.mcn.2012.11.007
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发表时间:
2013-01
期刊:
Molecular and cellular neurosciences
影响因子:
--
通讯作者:
Martin DM
Martin DM
中科院分区:
其他
文献类型:
--
作者:
Waite MR;Skidmore JM;Micucci JA;Shiratori H;Hamada H;Martin JF;Martin DM

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发育过程中基因表达的转录调控对神经元的分化和迁移至关重要。大多数哺乳动物基因的选择性剪接和差异异构体表达已被证实,但它们对基因功能的具体贡献还不清楚。在小鼠中,转录因子基因Pitx2表达为三种不同的同种型(PITX2A、PITX2B和PITX2C),其具有独特的氨基末端和共同的DNA结合同源结构域和羧基末端。这些亚型在神经元发育中的具体作用尚不清楚。在这里,我们报告的发病Pitx2ab和Pitx2c亚型特异性表达E9.5在发育中的小鼠大脑。使用同种型特异性Pitx2缺失小鼠品系,我们表明丘神经元迁移需要PITX2AB,丘GABA能分化和下丘脑投射的靶向需要独特的Pitx2同种型剂量。这些结果提供了深入了解Pitx2的剂量和异构体的具体要求中脑和下丘脑的发展。
Transcriptional regulation of gene expression during development is critical for proper neuronal differentiation and migration. Alternative splicing and differential isoform expression have been demonstrated for most mammalian genes, but their specific contributions to gene function are not well understood. In mice, the transcription factor gene Pitx2 is expressed as three different isoforms (PITX2A, PITX2B, and PITX2C) which have unique amino termini and common DNA binding homeodomains and carboxyl termini. The specific roles of these isoforms in neuronal development are not known. Here we report the onset of Pitx2ab and Pitx2c isoform-specific expression by E9.5 in the developing mouse brain. Using isoform-specific Pitx2 deletion mouse strains, we show that collicular neuron migration requires PITX2AB and that collicular GABAergic differentiation and targeting of hypothalamic projections require unique Pitx2 isoform dosage. These results provide insights into Pitx2 dosage and isoform-specific requirements underlying midbrain and hypothalamic development.
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