ISSN: 0022-1198
CODEN: JFSCA
Page Count: 4

Deoxyribonuclease I Phenotyping from Saliva Stains
Tsubota, E
Fukui Medical University,

Kishi, K
Gunma University School of Medicine,

Sawazaki, K

Aoyama, M
Fukui Medical University,

Iida, R
Fukui Medical University,

Matsuki, T
Fukui Medical University,

Yasuda, T
Gunma University School of Medicine,

(Received 3 March 1998; accepted 25 May 1998)

Abstract

Good typing results were obtained using a newly developed method for extraction and purification of deoxyribonuclease I (DNase I) from saliva stains. Previously, DNase I phenotyping from saliva stains has been unsuccessful because of low enzyme activity and heavy contamination. Salivary DNase I was extracted from stains using phosphate buffer containing Nonidet P-40. Extracts were purified using Phenyl Sepharose CL-4B gel. Electrophoresis was performed, and DNase I was successfully phenotyped. All of the DNase I phenotypes, which were obtained from saliva stains using this new method, were identical to the phenotypes determined from urine samples. Moreover, DNase I was correctly phenotyped from saliva stains that had been stored for over three months at room temperature or at 37°C. These results suggest that DNase I polymorphisms provide valuable information for forensic characterization of saliva stains.

Keywords:
forensic science, deoxyribonuclease I, dried agarose film overlay, isoelectric focusing, polymorphism, saliva stains

Paper ID: JFS14428J
DOI: 10.1520/JFS14428J
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