- 01 Introduction
- 02 Biology of DNA
- 03 Practical Issues Specific to DNA Evidence
- 04 Introduction to the Forensic DNA Laboratory
- 05 Assuring Quality in DNA Testing
- 06 Understanding a Forensic DNA Lab Report
- 07 Statistics and Population Genetics
- 08 Mitochondrial DNA & Y-STR Analysis
- 09 Forensic DNA Databases
- 10 Collection of DNA Evidence from Suspects and Arrestees
- 11 Pretrial DNA Evidence Issues
- 12 Victim Issues
- 13 Trial Presentation
- 14 Postconviction DNA Cases
- 15 Emerging Trends
Principles of Forensic DNA
for Officers of the Court
for Officers of the Court
Module 15 :: Emerging Trends
Topic 1 :: Single Nucleotide Polymorphisms (SNPs)
Single Nucleotide Polymorphisms (SNPs)
The forensic science community continues to seek methods that can expand the range of sample types that may be tested. Just as short tandem repeats (STRs) were developed so that smaller and more degraded samples could be tested than with restriction fragment length polymorphism (RFLP), single nucleotide polymorphisms (SNPs, often pronounced "snips") can be used to obtain results from even smaller and more degraded DNA samples than with STRs.
Conventional DNA testing methods may not yield results when DNA is highly degraded. For example, in the World Trade Center terrorist attack, DNA of the victims was subjected to such extended periods of extreme temperature that conventional testing could not be used to identify human remains.
