STRmix to showcase Y-STR work at ISFG Congress in Montréal

STRmix will present a poster and a talk at the 31st International Society for Forensic Genetics Congress in Montréal from Aug. 17-21. The sessions will focus on probabilistic genotyping and likelihood ratio behavior for mixed and low-template Y-STR samples, issues that affect how forensic labs interpret complex DNA evidence.

Why it matters: - The STRmix presentations aim at a core forensic problem: how to interpret complex Y-STR DNA evidence more consistently. - The work could affect how laboratories handle mixtures, low-template samples, and uncertainty in likelihood ratios. - STRmix software is used in criminal casework worldwide, so changes in interpretation methods can have broad downstream impact.

What happened: - STRmix will have a major presence at the 31st Congress of the International Society for Forensic Genetics in Montréal from Aug. 17-21. - The company will staff a booth on the exhibition floor. - STRmix will present a talk titled “Likelihood Ratio Behavior for Mixed and Low Template Y-STR Samples in the Haplotype-Centered Method.” - STRmix will also take part in a poster session titled “Probabilistic Genotyping of Y-STR Profiles.” - The poster session is scheduled for Wednesday, Aug. 19, beginning at 10:49 a.m. - The talk is scheduled for Aug. 21 at 12:15 p.m.

The details: - Emma Marie, a data analyst at STRmix, will present the poster session. - The poster will share early results from a sensitivity and specificity study across mixed Y-STR profiles of varying quality and quantity. - The poster will examine whether probabilistic genotyping can address interpretation challenges in complex mixtures with multiple male contributors. - The session will address variability across laboratories in handling stochastic effects, PCR artifacts and multi-copy loci. - Dr. Hannah Kelly, STRmix science leader, will present the talk. - The talk will present results from the Haplotype Centered Likelihood Ratio, or HC-LR. - HC-LR allows locus-specific haplotype weights to be incorporated into a likelihood ratio for Y-STR data. - Kelly said the results will show that HC-LR decreases as uncertainty in contributing haplotypes rises. - Kelly said likelihood ratios trend toward one as sample information decreases. - Kelly said that pattern supports the method’s use in a probabilistic Y-STR interpretation framework. - ISFG was founded in 1968 and has more than 1,100 members from over 60 countries. - The congress program includes plenary sessions, keynote presentations, panel discussions, workshops and poster sessions. - ISFG meetings are intended to cover scientific developments, technological innovations and practical applications in forensic genetics. - STRmix has been used in more than 700,000 criminal cases worldwide since its introduction in 2012. - The software has been used to help resolve violent crime, sexual assault and cold cases. - STRmix has three related software products: FaSTR DNA, DBLR and STRmix NGS. - FaSTR DNA analyzes raw DNA data and estimates the number of contributors when used with STRmix. - DBLR supports kinship analysis, database searches, mixture-to-mixture matches and visualization of DNA mixture evidence when used with STRmix. - STRmix NGS handles fully continuous mixture interpretation and likelihood ratio generation for Next Generation Sequencing profiles. - STRmix, FaSTR DNA and DBLR cover the workflow from analysis to interpretation and database matching. - STRmix NGS expands the kinds of profiles that can be interpreted. - More information about ISFG is available at the congress website. - More information about STRmix is available at the company website.

Between the lines: - STRmix is using the congress to highlight work on Y-STR interpretation, an area where forensic labs still face uneven practices and subjectivity. - The focus on likelihood ratios and low-template samples suggests the company is pushing for methods that better quantify uncertainty in difficult cases. - The booth, poster and talk together give STRmix multiple ways to position its software as part of a broader forensic workflow, not just a single product.

What's next: - The company’s poster session and talk will run during the congress week in Montréal. - Attendees will be able to review the early study results and the HC-LR findings at the scheduled sessions. - The congress may also serve as a venue for broader adoption interest among forensic laboratories and researchers.