Effects of cdc42 gene knockout by CRISPR/Cas9 technology on osteochondral development in zebrafish

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Effects of cdc42 gene knockout by CRISPR/Cas9 technology on osteochondral development in zebrafish

Basic Medicine | 更新时间：2026-01-09

- Effects of cdc42 gene knockout by CRISPR/Cas9 technology on osteochondral development in zebrafish
- Journal of Army Medical University Vol. 46, Issue 22, Pages: 2485-2492(2024)
- 作者机构：
  
  400016 重庆，重庆医科大学附属第二医院骨科关节外科中心
- 作者简介：
- 基金信息：
  
  the National Natural Science Foundation for Young Scholars of China(82002307);the General Program of National Natural Science Foundation of China(82372397);the General Program of Natural Science Foundation of Chongqing(cstc2021jcyj-msxmX0121);the Lump Sum Contract Project of Chongqing Talent Program(cstc2022ycjh-bgzxm0052)
- DOI：10.16016/j.2097-0927.202405033
  CLC： R322.71;R394-33;R394.1
- Received：09 May 2024，
  
  Revised：2024-06-15，
  
  Published：30 November 2024
- 稿件说明：
移动端阅览
Yunfei YANG, Yi LI, Xianding SUN, et al. Effects of cdc42 gene knockout by CRISPR/Cas9 technology on osteochondral development in zebrafish[J]. Journal of Army Medical University, 2024, 46(22): 2485-2492.
DOI：

Yunfei YANG, Yi LI, Xianding SUN, et al. Effects of cdc42 gene knockout by CRISPR/Cas9 technology on osteochondral development in zebrafish[J]. Journal of Army Medical University, 2024, 46(22): 2485-2492. DOI： 10.16016/j.2097-0927.202405033.

摘要

目的

2

利用CRISPR/Cas9技术敲除斑马鱼cdc42基因，探讨其对早期骨软骨发育的影响。

方法

2

通过多序列比对分析cdc42的种属保守性，设计cdc42基因的gRNA，利用CRISPR/Cas9技术构建cdc42敲除的斑马鱼突变体。应用整胚原位杂交检测cdc42的表达模式，繁殖并利用转基因标记鱼系Tg(col2a1a: GFP)观察软骨发育表型，并通过茜素红染色观察椎体矿化。

结果

2

多序列比对分析显示cdc42在人、小鼠和斑马鱼中高度保守，原位杂交结果显示cdc42在斑马鱼头颅及身体中广泛表达，包括下颌软骨区域。成功设计cdc42的gRNA并利用CRISPR/Cas9技术构建了cdc42基因敲除的斑马鱼突变体。cdc42突变体在受精后第3天表现出体长短小(

P

＜0.01)和头颅发育迟缓，头部和眼睛小(

P

＜0.01)，以及下颌发育凹陷。Tg(col2a1a: GFP)斑马鱼显示突变体梅克尔软骨和角舌软骨细胞形态异常，软骨细胞排列紊乱，其角舌软骨夹角增大、长度缩短(

P

＜0.01)。纯合突变体在受精后10~13 d死亡。茜素红染色结果提示突变体椎体矿化数量减少以及软骨内骨化面积减少(

P

＜0.01)。

结论

2

通过CRISPR/Cas9技术成功敲除了斑马鱼cdc42基因，导致下颌软骨发育迟缓、椎体矿化延迟以及软骨内成骨减少。

Abstract

Objective

2

To knock out cdc42 gene in zebrafish using CRISPR/Cas9 technology

and investigate the effect of cdc42 on early osteochondral development.

Methods

2

After the conservation of cdc42 gene sequence of different species was analyzed by multiple sequence alignment analysis

guide RNA of cdc42 gene was designed

and cdc42 knockout zebrafish was constructed by CRISPR/Cas9 technology. The expression pattern of cdc42 was detected by whole-mount

in situ

hybridization

and the chondrogenesis phenotype was observed by transgenic labeled fish line Tg (col2a1a: GFP)

and vertebral mineralization was observed by alizarin red staining.

Results

2

Multiple sequence alignment analysis showed that cdc42 was highly conserved in human

mouse and zebrafish

and

in situ

hybridization results showed that cdc42 was expressed in a variety of tissues in the head and whole body

including mandibular cartilage. With the aid of guide RNA of cdc42

cdc42 knockout zebrafish was successfully constructed by CRISPR/Cas9 technology. The cdc42 mutants exhibited shortened body length (

P

<

0.01) and delayed cranial development at 3 d post fertilization

with small heads and eyes (

P

<

0.01)

as well as delayed mandibular development. The Tg(col2a1a: GFP) zebrafish showed that the mutants presented abnormal morphology of Meckel's cartilage and ceratohyal cartilage cells

with disordered arrangement of chondrocytes and increased angle and decreased length in ceratohyal cartilage (

P

<

0.01). The homozygous mutants died at 10~13 d after fertilization. The results of alizarin red staining suggested delayed vertebral mineralization and reduced endochondral ossification of the mutants.

Conclusion

2

CRISPR/Cas9 technology successfully knocks out the cdc42 gene in zebrafish

resulting in delayed development of jaw cartilage

delayed mineralization of the vertebrae

and decreased endochondral ossification.

关键词

Keywords

references

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