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Cell migration is impaired in XPA-deficient cells
Seiji Takeuchi1,2, Takeshi Fukumoto1, Chihiro Takemori1
1Division of Dermatology, Department of Internal Related Kobe University Graduate School of Medicine Kobe Japan.
Abstract:
Xeroderma pigmentosum (XP) is a hereditary disorder characterized by photosensitivity, predisposition to skin cancers, and neurological abnormalities including microcephaly and progressive neurodegeneration. A lack of nucleotide excision repair (NER) in patients with XP can cause hypersensitivity to the sun, leading to skin cancer, whereas the etiology of the neuronal symptoms of XP remains ambiguous. There are various neurological disorders that perturb neuronal migration, causing mislocalization and disorganization of the cortical lamination. Here, we investigated the role of the XP group-A (Xpa) gene in directed cell migration. First, we adopted an in utero electroporation method to transduce shRNA vectors into the murine embryonic cerebral cortex for the in vivo knockdown of Xpa. Xpa-knockdown neurons in the embryonic cerebral cortex showed abnormal cell migration, cell cycle exit, and differentiation. The genotype-phenotype relationship between the lack of XPA and cell migration abnormalities was confirmed using both a scratch assay and time-lapse microscopy in XP-A patient-derived fibroblasts. Unlike healthy cells, these cells showed impairment in overall mobility and the direction of motility. Therefore, abnormal cell migration may explain neural tissue abnormalities in patients with XP-A.
Insights
The XP group-A (XPA) gene is crucial for neuronal migration in the developing brain. Its deficiency in Xeroderma pigmentosum (XP) leads to abnormal cell movement, potentially explaining neurological issues in XP patients.
Area of Science:
- Genetics
- Neuroscience
- Cell Biology
Background:
- Xeroderma pigmentosum (XP) is a hereditary disorder causing sun sensitivity, skin cancer, and neurological deficits.
- The exact cause of neurological symptoms in XP, unlike skin issues linked to DNA repair defects, is unclear.
- Neuronal migration is vital for proper brain development, and its disruption causes neurological disorders.
Purpose of the Study:
- To investigate the role of the XP group-A (XPA) gene in directed cell migration.
- To determine if XPA deficiency contributes to neurological abnormalities observed in XP patients.
Main Methods:
- In utero electroporation was used to knock down the XPA gene in murine embryonic cerebral cortex.
- Scratch assays and time-lapse microscopy were performed on XP-A patient-derived fibroblasts to assess cell motility.
- Analysis of cell migration, cell cycle exit, and differentiation in XPA-deficient neurons.
Main Results:
- XPA knockdown in embryonic neurons resulted in abnormal cell migration, cell cycle exit, and differentiation.
- XP-A patient fibroblasts exhibited impaired overall mobility and directional motility compared to healthy cells.
- These findings establish a genotype-phenotype correlation between XPA deficiency and cell migration defects.
Conclusions:
- Abnormal cell migration due to XPA deficiency is a potential mechanism underlying neurological abnormalities in XP-A patients.
- The study highlights the importance of the XPA gene in neuronal development and migration.
- Targeting cell migration pathways could offer therapeutic strategies for XP-related neurological disorders.
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