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小头畸形研究新突破:边杉/郭贞明/王华/毛翛合作揭示CETN3缺陷致病新机制
来源:索码生物 发布日期:2026-01-26 浏览次数:12次

原发性小头畸形(primary microcephaly)是一种相对罕见的疾病,其特征是患者头围的显著减小,主要致病原因是神经干细胞基因表达异常,从而影响了正常的神经发生过程,导致神经元数量的减少。目前已知有32个基因与原发性遗传性小头形 (microcephaly primary hereditary, MCPH)相关,包括MCPH1、ASPM、WDR62等,大多数MCPH基因参与调节细胞周期、中心体组装、DNA修复和细胞凋亡等生物学过程。

近日,同济大学生命科学与技术学院边杉/郭贞明/湖南省儿童医院王华/湖南省妇幼毛翛课题组在临床上发现了一个携带CETN3缺失型突变的小头畸形病人,该患者的头围比正常水平小2-3个标准差。但是到目前为止,尚未清楚CETN3在人类大脑皮层发育中的调控功能。于是,研究人员们合作探索了该基因对大脑皮层发育的调控功能(索码生物参与构建CETN3突变的iPSC),研究成果在EMBO molecular medicine上发表。

01

CETN3缺失的人脑类器官表现出体积的减小

Centrin蛋白属于钙结合蛋白EF-hand超家族,含有四个钙结合结构域,在细胞中主要存在于与微管组织中心相关的结构中,例如中心体、纤毛或鞭毛、纺锤体等,大部分Centrin蛋白在细胞质和细胞核中也有分布。Centrin蛋白在进化上高度保守,但不同的生物含有的该蛋白编码基因数量不同,小鼠中有四个(CENT1-4),而人类含有三个(CETN1-3)。这些蛋白的表达模式在不同的组织和细胞中有所差异,暗示不同的Centrin蛋白可能参与了不同的生物学过程。
文章中,作者以探究CETN3在大脑皮层发育中的作用为重点,鉴定CETN3缺失突变导致小头畸形的致病可能性,并阐明其致病分子机制。首先,他们检测了CETN3在大脑皮层中的表达,发现其广泛表达于各种类型的细胞中。接着,他们利用CRISPR-Cas9和Cre-LoxP基因编辑技术构建了CETN3敲除的人胚胎干细胞(hESC)系和CETN3突变的诱导多能干细胞(iPSC)系,并以这些细胞系为基础,通过2D培养获得了神经干/祖细胞(NS/PC),通过3D培养获得大脑类器官。该类器官模型重现了病人中大脑体积减小的表型,证实了CETN3的致病性。

02

CETN3缺失影响了NS/PC的细胞周期、RNA剪接以及中心体复制

接着,利用RNA-seq、免疫荧光染色、流式细胞术等方法,作者团队进一步对CETN3蛋白调控神经发育的分子机制进行了研究,并发现CETN3通过调节NS/PC增殖、分化、凋亡和RNA剪接来影响神经发生,具体如下:(1)CETN3缺失引起了NS/PC有丝分裂纺锤体方向的改变,使其更倾向分化而不是增殖;(2)CETN3缺失导致NS/PC细胞周期受损,从而影响细胞增殖;(3)CETN3缺失引发中心体过度复制,导致NS/PC凋亡;(4)CETN3还可以通过参与RNA剪接来间接影响与中心粒、纤毛和细胞周期相关的基因的表达。值得关注的是,这是首次发现CETN3在调节RNA剪接方面的功能,作者团队还鉴定出了CETN3的这一功能可能与USP49的去泛素化功能和核小体H2B的泛素化水平有关。

03

CETN3缺失通过多种途径影响神经发育

最后,作者还构建了CETN3前脑特异性敲除的小鼠,以探究其在其他哺乳类神经发育中是否有相似的功能。结果发现小鼠中表型比较微弱,暗示CETN3在不同物种中的功能可能存在差异。

综上所述,该文章以大脑类器官为主要模型,首次揭示了CETN3在哺乳动物神经发育中的作用及其背后的分子机制。本研究证明了CETN3通过调节纺锤体定向、细胞周期、中心体复制等生物学过程参与了NPCs增殖和分化之间的平衡调控;本研究还首次发现CETN3通过与USP49相互作用参与了NPCs中的RNA剪接过程,从而间接影响了细胞周期和神经发育。这些结果提示了CETN3在人类大脑新皮层发育中的重要性,扩展了我们对原发性小头畸形致病基因的认识,为后续的临床检测和疾病治疗提供了新见解。

 

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  161. /www/wwwroot/somaxbio.com/vendor/topthink/think-orm/src/db/concern/JoinAndViewQuery.php ( 7.11 KB )
  162. /www/wwwroot/somaxbio.com/vendor/topthink/think-orm/src/db/concern/TableFieldInfo.php ( 2.63 KB )
  163. /www/wwwroot/somaxbio.com/vendor/topthink/think-orm/src/db/concern/Transaction.php ( 2.77 KB )
  164. /www/wwwroot/somaxbio.com/vendor/topthink/framework/src/think/log/driver/File.php ( 5.96 KB )
  165. /www/wwwroot/somaxbio.com/vendor/topthink/framework/src/think/contract/LogHandlerInterface.php ( 0.86 KB )
  166. /www/wwwroot/somaxbio.com/vendor/topthink/framework/src/think/log/Channel.php ( 3.89 KB )
  167. /www/wwwroot/somaxbio.com/vendor/topthink/framework/src/think/event/LogRecord.php ( 1.02 KB )
  168. /www/wwwroot/somaxbio.com/vendor/symfony/polyfill-mbstring/Mbstring.php ( 35.32 KB )
  169. /www/wwwroot/somaxbio.com/vendor/symfony/polyfill-mbstring/Resources/unidata/lowerCase.php ( 23.96 KB )
  170. /www/wwwroot/somaxbio.com/vendor/topthink/think-helper/src/Collection.php ( 16.47 KB )
  171. /www/wwwroot/somaxbio.com/vendor/topthink/think-orm/src/db/Express.php ( 1.53 KB )
  172. /www/wwwroot/somaxbio.com/vendor/topthink/think-view/src/Think.php ( 8.38 KB )
  173. /www/wwwroot/somaxbio.com/vendor/topthink/framework/src/think/contract/TemplateHandlerInterface.php ( 1.60 KB )
  174. /www/wwwroot/somaxbio.com/vendor/topthink/think-template/src/Template.php ( 46.61 KB )
  175. /www/wwwroot/somaxbio.com/vendor/topthink/think-template/src/template/driver/File.php ( 2.41 KB )
  176. /www/wwwroot/somaxbio.com/vendor/topthink/think-template/src/template/contract/DriverInterface.php ( 0.86 KB )
  177. /www/wwwroot/somaxbio.com/runtime/temp/63ab06502311cf3cb46c41aa08a3a0d8.php ( 22.65 KB )
  178. /www/wwwroot/somaxbio.com/app/index/model/LabelModel.php ( 7.63 KB )
  179. /www/wwwroot/somaxbio.com/vendor/topthink/framework/src/think/Response.php ( 8.81 KB )
  180. /www/wwwroot/somaxbio.com/vendor/topthink/framework/src/think/response/Html.php ( 0.97 KB )
  181. /www/wwwroot/somaxbio.com/vendor/topthink/think-trace/src/Html.php ( 4.30 KB )
  1. CONNECT:[ UseTime:0.018683s ] mysql:host=localhost;port=3306;dbname=somaxbio_com;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `db_cat` [ RunTime:0.002449s ]
  3. SELECT * FROM `db_cat` WHERE `catid` = 11 LIMIT 1 [ RunTime:0.001425s ]
  4. SHOW FULL COLUMNS FROM `db_cat_data` [ RunTime:0.003561s ]
  5. SELECT * FROM `db_cat_data` WHERE `catid` = 11 LIMIT 1 [ RunTime:0.001867s ]
  6. SHOW FULL COLUMNS FROM `db_cms_news` [ RunTime:0.002889s ]
  7. SELECT * FROM `db_cms_news` WHERE `id` = 905 LIMIT 1 [ RunTime:0.002061s ]
  8. SHOW FULL COLUMNS FROM `db_cms_news_data` [ RunTime:0.002180s ]
  9. SELECT * FROM `db_cms_news_data` WHERE `id` = 905 LIMIT 1 [ RunTime:0.000593s ]
  10. SHOW FULL COLUMNS FROM `db_replace` [ RunTime:0.001013s ]
  11. SELECT * FROM `db_replace` ORDER BY `sort` ASC LIMIT 2 [ RunTime:0.000319s ]
  12. UPDATE `db_cms_news` SET `views` = `views` + 1 WHERE `id` = 905 [ RunTime:0.011280s ]
  13. SELECT `title`,`id`,`catid` FROM `db_cms_news` WHERE ( `catid` = 11 AND `id` <> 905 AND `newstime` >= 1769396632 ) ORDER BY `newstime` ASC,`id` ASC LIMIT 1 [ RunTime:0.001572s ]
  14. SELECT `titleurl`,`link` FROM `db_cms_news` WHERE `id` = 903 LIMIT 1 [ RunTime:0.001251s ]
  15. SELECT `title`,`id`,`catid` FROM `db_cms_news` WHERE ( `catid` = 11 AND `id` <> 905 AND `newstime` <= 1769396632 ) ORDER BY `newstime` DESC,`id` DESC LIMIT 1 [ RunTime:0.001166s ]
  16. SELECT `titleurl`,`link` FROM `db_cms_news` WHERE `id` = 906 LIMIT 1 [ RunTime:0.001140s ]
  17. SELECT * FROM `db_cat` WHERE ( `pid` = 7 AND `status` = 1 ) ORDER BY `sort` ASC [ RunTime:0.000896s ]
  18. SELECT `catid`,`modelid` FROM `db_cat` WHERE ( `pid` = 20 AND `status` = 1 ) ORDER BY `sort` ASC [ RunTime:0.000641s ]
  19. SHOW FULL COLUMNS FROM `db_cms_product` [ RunTime:0.002161s ]
  20. SELECT * FROM `db_cms_product` WHERE ( `catid` = 20 ) ORDER BY `sort` ASC [ RunTime:0.001089s ]
  21. SELECT `catid`,`modelid` FROM `db_cat` WHERE ( `pid` = 51 AND `status` = 1 ) ORDER BY `sort` ASC [ RunTime:0.000564s ]
  22. SELECT * FROM `db_cms_product` WHERE ( `catid` = 51 ) ORDER BY `sort` ASC [ RunTime:0.000891s ]
  23. SELECT `catid`,`modelid` FROM `db_cat` WHERE ( `pid` = 21 AND `status` = 1 ) ORDER BY `sort` ASC [ RunTime:0.000786s ]
  24. SELECT * FROM `db_cms_product` WHERE ( `catid` = 21 ) ORDER BY `sort` ASC [ RunTime:0.000983s ]
  25. SELECT `catid`,`modelid` FROM `db_cat` WHERE ( `pid` = 22 AND `status` = 1 ) ORDER BY `sort` ASC [ RunTime:0.000653s ]
  26. SELECT * FROM `db_cms_product` WHERE ( `catid` = 22 ) ORDER BY `sort` ASC [ RunTime:0.000956s ]
  27. SELECT `catid`,`modelid` FROM `db_cat` WHERE ( `pid` = 53 AND `status` = 1 ) ORDER BY `sort` ASC [ RunTime:0.000700s ]
  28. SELECT * FROM `db_cms_product` WHERE ( `catid` = 53 ) ORDER BY `sort` ASC [ RunTime:0.001737s ]
  29. SELECT `catid`,`modelid` FROM `db_cat` WHERE ( `pid` = 41 AND `status` = 1 ) ORDER BY `sort` ASC [ RunTime:0.000623s ]
  30. SELECT * FROM `db_cms_product` WHERE ( `catid` = 41 ) ORDER BY `sort` ASC [ RunTime:0.001613s ]
  31. SELECT * FROM `db_cat` WHERE ( `pid` = 7 AND `status` = 1 ) ORDER BY `sort` ASC,`catid` ASC [ RunTime:0.000940s ]
  32. SELECT `catid`,`modelid` FROM `db_cat` WHERE ( `pid` = 20 AND `status` = 1 ) ORDER BY `sort` ASC [ RunTime:0.000607s ]
  33. SELECT * FROM `db_cms_product` WHERE ( `catid` = 20 ) ORDER BY `sort` ASC [ RunTime:0.000985s ]
  34. SELECT `catid`,`modelid` FROM `db_cat` WHERE ( `pid` = 51 AND `status` = 1 ) ORDER BY `sort` ASC [ RunTime:0.000717s ]
  35. SELECT * FROM `db_cms_product` WHERE ( `catid` = 51 ) ORDER BY `sort` ASC [ RunTime:0.000866s ]
  36. SELECT `catid`,`modelid` FROM `db_cat` WHERE ( `pid` = 21 AND `status` = 1 ) ORDER BY `sort` ASC [ RunTime:0.000458s ]
  37. SELECT * FROM `db_cms_product` WHERE ( `catid` = 21 ) ORDER BY `sort` ASC [ RunTime:0.001148s ]
  38. SELECT `catid`,`modelid` FROM `db_cat` WHERE ( `pid` = 22 AND `status` = 1 ) ORDER BY `sort` ASC [ RunTime:0.000640s ]
  39. SELECT * FROM `db_cms_product` WHERE ( `catid` = 22 ) ORDER BY `sort` ASC [ RunTime:0.001011s ]
  40. SELECT `catid`,`modelid` FROM `db_cat` WHERE ( `pid` = 53 AND `status` = 1 ) ORDER BY `sort` ASC [ RunTime:0.000753s ]
  41. SELECT * FROM `db_cms_product` WHERE ( `catid` = 53 ) ORDER BY `sort` ASC [ RunTime:0.000757s ]
  42. SELECT `catid`,`modelid` FROM `db_cat` WHERE ( `pid` = 41 AND `status` = 1 ) ORDER BY `sort` ASC [ RunTime:0.000698s ]
  43. SELECT * FROM `db_cms_product` WHERE ( `catid` = 41 ) ORDER BY `sort` ASC [ RunTime:0.001017s ]
  44. SELECT `catid`,`modelid` FROM `db_cat` WHERE ( `pid` = 11 AND `status` = 1 ) ORDER BY `sort` ASC [ RunTime:0.000655s ]
  45. SELECT * FROM `db_cms_news` WHERE ( `catid` = 11 ) ORDER BY `sort` ASC,`is_top` DESC,`is_good` DESC,`newstime` DESC LIMIT 5 [ RunTime:0.004618s ]
  46. SELECT * FROM `db_cat` WHERE ( `pid` = 7 AND `status` = 1 ) ORDER BY `sort` ASC [ RunTime:0.001857s ]
  47. SELECT `catid`,`modelid` FROM `db_cat` WHERE ( `pid` = 41 AND `status` = 1 ) ORDER BY `sort` ASC [ RunTime:0.000670s ]
  48. SELECT * FROM `db_cms_product` WHERE ( `catid` = 41 ) ORDER BY `sort` ASC [ RunTime:0.000982s ]
0.247096s