Forensic DNA marker · BEGINNER LESSON
D22
D22 is a DNA locus listed in several forensic multiplex panels used to generate and interpret DNA profiles. In this source, it is described as one marker among others that may help compare DNA from a crime stain with a person of interest.
What D22 is
D22 is a named DNA locus, meaning a specific position on DNA that can be included in a profiling panel. The source lists D22 among loci present in several current multiplexes used in forensic science, including NGMSE, ESI, DNA23+, and CODIS expanded. A multiplex is a test panel that looks at several DNA loci at once.
[1] Interpretation of DNA data within the context of UK forensic science
What is measured and why it matters
In forensic work, DNA data from loci such as D22 are interpreted to help answer whether the DNA of a person of interest is present in a crime stain. The same interpretation also tries to support when and how the DNA may have been deposited, although the source does not describe a single direct measurement for time or mechanism; it describes interpretive use of the DNA data.
[1] Interpretation of DNA data within the context of UK forensic science
How D22 fits into forensic interpretation
A DNA profile is built from the results at multiple loci. Because D22 is one of those loci in some panels, it can contribute to the overall profile used by criminal courts. The important idea is not that D22 alone proves a fact, but that its result is part of a larger set of DNA data considered together.
[1] Interpretation of DNA data within the context of UK forensic science
Limitations
The source gives only a brief listing of D22 in multiplex panels and a general statement about how forensic DNA data are interpreted. It does not explain the biology of the locus, how often it varies, how strong its individual evidential value is, or how to read a D22 result by itself. That means any conclusion from D22 depends on the full profile and the forensic interpretation framework, not on the name alone.
[1] Interpretation of DNA data within the context of UK forensic science
SEE THE IDEA
D22 in forensic DNA profiling
Biological material collected from a scene
A test that reads several DNA loci together
One of the loci included in some panels
Comparison of profile data with a person of interest
Crime stain DNA is tested in a multiplex panel, D22 contributes one locus result, and that result is interpreted with the rest of the profile.
D22 is one part of a larger forensic DNA data set; its meaning comes from the full panel, not from the locus alone.
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Sources and further reading
This general lesson was generated from public source material. It explains a concept; it does not interpret a private paper or provide medical advice.