Limit Detection of Short Tandem Repeats (STR) Analysis on Touch DNA Samples
Vira Saamia(1), Ahmad Yudianto(2*), Muktiningsih Nurjayadi(3), Novitasari Novitasari(4), Abdul Hadi Furqoni(5)
(1) Doctoral Program of Medical Science, Faculty of Medicine, Universitas Airlangga, Jl. Mayjen Prof. Dr. Moestopo 47, Surabaya 60131, Indonesia; Center Forensic Laboratory of Indonesia National Police, Jl. Raya Babakan Madang 67, Sentul, Bogor 16810, Indonesia
(2) Doctoral Program of Medical Science, Faculty of Medicine, Universitas Airlangga, Jl. Mayjen Prof. Dr. Moestopo 47, Surabaya 60131, Indonesia; Forensic Study Program, Magister Program of Postgraduate School of Forensics Study, Universitas Airlangga, Jl. Airlangga 4–6, Surabaya 60286, Indonesia
(3) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta, Jl. Rawamangun Muka, Jakarta Timur 13220, Indonesia
(4) Research Center for Testing Technology and Standard, National Research and Innovation Agency (BRIN), Jl. Raya Puspitek Serpong, Tangerang Selatan 15314, Indonesia
(5) Center for Biomedical Research, Research Organization for Health, National Research and Innovation Agency (BRIN), Jl. Raya Jakarta Bogor KM 46, Cibinong, Jawa Barat 16911, Indonesia
(*) Corresponding Author
Abstract
Forensic short tandem repeats (STR) profiling on touch DNA samples has emerged as a primary method for human identification. The stability and uniqueness of STR combination from the targeted locus in each individual make it a precision marker for human identification. Touch DNA samples can be found in traces of biological material shed from a person. This work aimed to identify the lowest concentration limit required for generating an interpretable DNA profile and the sensitivity of the STR loci applied. Touch DNA samples were collected from donors who were asked to hold a rope for 5 min. A double swab technique was used to lift the touch samples from the rope. These samples are subjected to DNA extraction and quantification. Two STR amplification cycles, 29 and 34 cycles, were used. DNA concentration greatly influences the success of amplifying the target allele at each STR locus to be interpreted into a complete DNA profile, shown by its allele peak. Touch DNA concentration >0.25 ng can produce a complete DNA profile. LCN method successfully amplified touch DNA with a concentration 0.0625–0.25 ng/µL. Limit detection of touch DNA analysis is 0.25 ng/µL. Low-copy DNA can still be analyzed within 0.0625–0.25 ng/µL.
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DOI: https://doi.org/10.22146/ijc.94081
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