We focus on lyotropic liquid crystals (LCs) in water system similar to living body, and have investigated the behavior of deoxyribonucleic acid (DNA) molecules in the DNA-doped lyotropic LC. As a result, the microscopic texture becomes disturbed and the domain breaks down by DNA doping. Therefore, DNA molecules can behave as impurities. Furthermore, in the ion density measurement, the ion current peaks appear by DNA doping, and thus, DNA molecules can behave as ion careers in the LC medium. On the other hand, DNA molecules form the aggregations in their high concentration.