STRs vs. SNPs: Thoughts on the future of forensic DNA testing

John M. Butler, Michael D. Coble, Peter M. Vallone

Research output: Contribution to journalArticlepeer-review

122 Scopus citations


Largely due to technological progress coming from the Human Genome and International HapMap Projects, the issue has been raised in recent years within the forensic DNA typing community of the potential for single nucleotide polymorphism (SNP) markers as possible replacements of the currently used short tandem repeat (STR) loci. Our human identity testing project team at the U.S. National Institute of Standards and Technology (NIST) has explored numerous SNP and STR loci and assays as well as developing miniSTRs for degraded DNA samples. Based on their power of discrimination, use in deciphering mixture components, and ability to be combined in multiplex assays in order to recover information from low amounts of biological material, we believe that STRs rather than SNPs will fulfill the dominant role in human identity testing for the foreseeable future. However, SNPs may play a useful role in specialized applications such as mitochondrial DNA (mtDNA) testing, Y-SNPs as lineage markers, ancestry informative markers (AIMs), the prediction of phenotypic traits, and other potential niche forensic casework applications.

Original languageEnglish
Pages (from-to)200-205
Number of pages6
JournalForensic Science, Medicine, and Pathology
Issue number3
StatePublished - Sep 2007


  • DNA
  • DNA profiling
  • DNA typing
  • MiniSTR
  • MtDNA
  • SNP
  • STR
  • Short tandem repeat
  • Single nucleotide polymorphism


Dive into the research topics of 'STRs vs. SNPs: Thoughts on the future of forensic DNA testing'. Together they form a unique fingerprint.

Cite this