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Hsia NY, Hu PS, Chuang CL, Mong MC, Chen HC, Tsai CW, Wang YC, Chen JC, Bau DAT, Chang WS. Contribution of Radiation Sensitive Protein 51 Genotypes to Pterygium Risk in a Taiwanese Population. In Vivo 2024; 38:2197-2204. [PMID: 39187312 PMCID: PMC11363769 DOI: 10.21873/invivo.13683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2024] [Revised: 05/25/2024] [Accepted: 06/07/2024] [Indexed: 08/28/2024]
Abstract
BACKGROUND/AIM In current literature, there is a notable lack of studies investigating the role of radiation-sensitive protein 51 (RAD-51) in pterygium diagnosis. Nevertheless, reports indicate elevated expression levels of RAD-51 among recurrent pterygium cases compared to those with primary pterygium. However, the genomic involvement of RAD-51 has yet to be explored in any population. This study aimed to assess the contribution of RAD-51 genotypes to pterygium risk in a representative Taiwanese population. MATERIALS AND METHODS RAD-51 rs1801320 genotyping was successfully conducted in a Taiwanese cohort comprising 140 pterygium cases and 280 non-pterygium controls using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) technology. RESULTS The distribution of RAD-51 rs1801320 genotypes (GG, CG, and CC) in the pterygium group (70.0%, 25.7%, and 4.3%, respectively) did not significantly differ from that in the non-pterygium group (73.6%, 23.6%, and 2.8% for GG, CG, and CC genotypes, respectively; p for trend=0.6337). Carriers of the variant CG and CC RAD-51 rs1801320 genotypes exhibited 1.15- and 1.58-fold increased pterygium risk, respectively (95%CI=0.72-1.84 and 0.53-4.67, p=0.6552 and p=0.5914, respectively). In the dominant model, there appeared to be a slight association between variant genotypes CG and CC and pterygium risk (OR=1.19, 95%CI=0.76-1.87, p=0.0223). Allelic analysis revealed that the RAD-51 rs1801320 variant C allele was not significantly linked to pterygium risk (17.1% versus 14.6%, OR=1.20, 95%CI=0.82-1.78, p=0.3991). CONCLUSION Variant genotypes at RAD-51 rs1801320 were firstly identified to associate with susceptibility to pterygium among Taiwanese individuals. Nonetheless, these findings warrant validation in larger and more diverse populations.
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Affiliation(s)
- Ning-Yi Hsia
- Department of Ophthalmology, China Medical University Hospital, Taichung, Taiwan, R.O.C
- Terry Fox Cancer Research Laboratory, Department of Medical Research, China Medical University Hospital, Taichung, Taiwan, R.O.C
| | - Pei-Shin Hu
- Department of Ophthalmology, China Medical University Hospital, Taichung, Taiwan, R.O.C
- Department of Ophthalmology, Changhua Christian Hospital, Changhua, Taiwan, R.O.C
| | | | - Mei-Chin Mong
- Department of Food Nutrition and Health Biotechnology, Asia University, Taichung, Taiwan, R.O.C
| | - Hung-Chih Chen
- Department of Ophthalmology, Show Chwan Memorial Hospital, Changhua, Taiwan, R.O.C
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan, R.O.C
| | - Chia-Wen Tsai
- Terry Fox Cancer Research Laboratory, Department of Medical Research, China Medical University Hospital, Taichung, Taiwan, R.O.C
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan, R.O.C
| | - Yun-Chi Wang
- Terry Fox Cancer Research Laboratory, Department of Medical Research, China Medical University Hospital, Taichung, Taiwan, R.O.C
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan, R.O.C
| | - Jaw-Chyun Chen
- Department of Medicinal Botanicals and Foods on Health Applications, Da-Yeh University, Changhua, Taiwan, R.O.C
| | - DA-Tian Bau
- Terry Fox Cancer Research Laboratory, Department of Medical Research, China Medical University Hospital, Taichung, Taiwan, R.O.C.;
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan, R.O.C
- Department of Bioinformatics and Medical Engineering, Asia University, Taichung, Taiwan, R.O.C
| | - Wen-Shin Chang
- Terry Fox Cancer Research Laboratory, Department of Medical Research, China Medical University Hospital, Taichung, Taiwan, R.O.C.;
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan, R.O.C
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Takahashi M, Norden B. Linear Dichroism Measurements for the Study of Protein-DNA Interactions. Int J Mol Sci 2023; 24:16092. [PMID: 38003280 PMCID: PMC10671323 DOI: 10.3390/ijms242216092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 11/04/2023] [Accepted: 11/06/2023] [Indexed: 11/26/2023] Open
Abstract
Linear dichroism (LD) is a differential polarized light absorption spectroscopy used for studying filamentous molecules such as DNA and protein filaments. In this study, we review the applications of LD for the analysis of DNA-protein interactions. LD signals can be measured in a solution by aligning the sample using flow-induced shear force or a strong electric field. The signal generated is related to the local orientation of chromophores, such as DNA bases, relative to the filament axis. LD can thus assess the tilt and roll of DNA bases and distinguish intercalating from groove-binding ligands. The intensity of the LD signal depends upon the degree of macroscopic orientation. Therefore, DNA shortening and bending can be detected by a decrease in LD signal intensity. As examples of LD applications, we present a kinetic study of DNA digestion by restriction enzymes and structural analyses of homologous recombination intermediates, i.e., RecA and Rad51 recombinase complexes with single-stranded DNA. LD shows that the DNA bases in these complexes are preferentially oriented perpendicular to the filament axis only in the presence of activators, suggesting the importance of organized base orientation for the reaction. LD measurements detect DNA bending by the CRP transcription activator protein, as well as by the UvrB DNA repair protein. LD can thus provide information about the structures of protein-DNA complexes under various conditions and in real time.
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Affiliation(s)
- Masayuki Takahashi
- School of Life Science and Technology, Tokyo Institute of Technology, Oookayama, Meguro, Tokyo 152-8550, Japan
| | - Bengt Norden
- Department of Chemical and Biological Engineering, Chemistry, Chalmers University of Technology, 412 96 Gothenburg, Sweden;
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