LRmix Studio
Definition
A semi-continuous probabilistic genotyping platform developed at Leiden University Medical Center. One of the first PG tools adopted by European forensic laboratories; largely superseded by continuous models for complex mixtures.
- Developer
- Netherlands Forensic Institute / Leiden UMC
- Model type
- Semi-continuous probabilistic genotyping
- Status
- Largely superseded by continuous models
- Application
- DNA mixture interpretation
Common questions
What is the difference between semi-continuous and continuous probabilistic genotyping?+
Semi-continuous models use only allele presence or absence together with drop-out probabilities. Continuous models also use peak height information, giving them more discriminating power for complex or low-template mixtures.
Why has LRmix Studio been superseded rather than simply retired?+
Continuous models such as STRmix and TrueAllele extract more information from the same electropherogram by modelling peak heights directly, so many laboratories migrated to them for complex mixture casework, though semi-continuous tools remain historically important and are still taught.
Related terms
- Continuous Model
- A probabilistic genotyping approach that treats peak heights as a continuous variable and models their probability under different contributor genotype combinations, as...
- EuroForMix
- An open-source continuous probabilistic genotyping platform developed by the Norwegian Institute of Public Health. Distributed as an R package and used by...
- MCMC (Markov Chain Monte Carlo)
- A computational sampling method used by STRmix and TrueAllele to integrate the likelihood function over all possible contributor genotype combinations. Requires many...
- Mixture
- A DNA sample containing contributions from two or more individuals. Identified by the presence of more than two alleles at one or...
- Mixture Ratio
- The proportional representation of each contributor's DNA in the mixture, estimated from the relative peak heights of non-overlapping alleles across multiple loci.
- Number of Contributors (NoC)
- The estimated minimum number of individuals whose DNA is present in a mixture, derived from the maximum allele count at any single...
- Probabilistic Genotyping (PG)
- A computational approach to mixture interpretation that models the entire electropherogram as a probabilistic output of a specified number of contributors, computing...
- Stochastic Threshold (ST)
- A validated minimum peak height below which allele calls are considered uncertain due to stochastic amplification effects. Profiles with peaks between the...
- STRmix
- A continuous probabilistic genotyping platform developed by ESR (New Zealand) and the Australian Federal Police. The most widely used PG platform in...
- TrueAllele
- A continuous probabilistic genotyping platform developed by Cybergenetics (Pittsburgh, PA). Used primarily in US criminal courts; available as a cloud-based service.