Method for distinguishing individual in mixed seminal stain by single sperm capture and mitochondrial DNA typing
A technology of DNA typing and single sperm, which is applied in the field of forensic personal identification and testing, and can solve the problems of unsatisfactory and unavailable DNA content
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[0052] Single sperm capture mitochondrial DNA typing is a method for distinguishing individuals in mixed sperm spots, which is achieved through the following steps:
[0053] 1. Single sperm capture
[0054] The mixed sperm spot samples were smeared, and a single sperm was collected by using the LMD7000 Leica laser microdissection system (Leica, Germany), and each sperm was collected in a test tube.
[0055] 2. Single sperm DNA extraction
[0056] 1. Add 15 μL 5% Chelex-100, 0.2 μL 10 mg / ml proteinase K (final concentration 100 μg / ml), and 0.7 μL 1M DTT (final concentration 40 mM) to each test tube containing single sperm.
[0057] 2. Oscillate for 10s.
[0058] 3. Digest at 56°C for 1h to 2h.
[0059] 4. Oscillate for 10s.
[0060] 5. Incubate in a boiling water bath for 8 minutes.
[0061] 6. Oscillate for 10s.
[0062] 7. Centrifuge at 13000rpm for 2min.
[0063] 8. Put the supernatant in a 4°C refrigerator for later use.
[0064] 3. Nested amplification of mtDNA HV Ⅰ ...
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