Forensic Biotechnology
A complete, journal-grade reference: biomolecules and the central dogma, recombinant DNA tools, body-fluid identification and extraction, PCR and STR typing, mixture statistics, specialised markers (mtDNA, Y-STR, X-STR, SNP), bioinformatics, non-human forensics (species, wildlife, microbial, plant, diatom), Disaster Victim Identification and kinship, next-generation sequencing and emerging markers (methylation, miRNA, cell-free DNA, phenotyping), and the quality, database and admissibility framework that governs the discipline globally.
- 105hours
- 34topics
- 10modules
Biomolecules and the molecular foundations
The molecular biology a forensic biotechnologist uses every day before any kit is opened: DNA, RNA and the central dogma; the cell, nucleus and mitochondrion as DNA reservoirs; and the polymorphism classes (RFLP, VNTR, STR, SNP, mtDNA) that drive forensic identification.
Start module- DNA, RNA and the Central Dogma of Molecular BiologyThe molecular biology a forensic DNA examiner uses on every case: the double helix, antiparallel strands and base-pairing rules; the central dogma of replication, transcription and translation; and why these foundations decide what a PCR reaction can and cannot recover from degraded evidence.12 min
- The Cell, the Nucleus and the Mitochondrion as DNA ReservoirsWhere forensic DNA actually lives: the nucleus carrying the autosomes and the sex chromosomes, the mitochondrion carrying the small circular maternal-inheritance genome, and the practical case implications for skeletal remains, hair shafts, blood, semen and saliva.10 min
- Polymorphism, Heredity and the Markers that Identify a PersonHow variation between people is encoded into the genome and harvested by forensic ID: RFLP, VNTR, STR, SNP and mtDNA as the marker classes that drove the discipline from 1985 to today, and the heredity rules (autosomal, X-linked, Y-linked, mitochondrial) every examiner uses to read a profile.12 min
Recombinant DNA technology and molecular tools
The classical biotech toolkit that underpins every forensic DNA method: restriction enzymes, vectors and molecular cloning; Sanger sequencing chemistry as the technique behind every modern method; and hybridisation, blot techniques and microarrays in forensic context.
Start module- Restriction Enzymes, Vectors, Ligation and Molecular CloningThe classical recombinant DNA toolkit that powered RFLP forensics and still underpins every reagent kit on a forensic bench: restriction endonucleases and recognition sites, ligation, plasmid and BAC vectors, blue-white screening, and how each step maps to a modern forensic application.14 min
- Sanger Sequencing Chemistry and Modern MethodsDideoxy chain termination, fluorescent ddNTPs, capillary read-out and base calling: the chemistry that took the human genome to draft in 2001 and still anchors mtDNA forensic sequencing, plus how Sanger sits beside Illumina sequencing-by-synthesis and Oxford Nanopore on a modern bench.12 min
- Hybridisation, Southern, Northern, Western Blots and MicroarraysMolecular hybridisation, Southern blot for DNA (the original RFLP DNA fingerprint of 1984), Northern for RNA, Western for protein, and the microarray surface that drove HLA typing and SNP genotyping before NGS, with each technique mapped to a forensic use it still has today.12 min
Sample collection, body fluids and DNA isolation
From scene to a clean extract on the bench: presumptive and confirmatory body-fluid identification, touch DNA and challenging substrates (hair, bone, teeth), the extraction stack every operational lab runs (organic, Chelex, silica-column, magnetic-bead), and the differential extraction that separates sperm from epithelial cells in sexual-assault casework.
Start module- Body-Fluid Identification: Presumptive and Confirmatory TestsThe screen-then-confirm logic that every body-fluid case follows: Kastle-Meyer, leuco-malachite and luminol for blood, acid phosphatase and PSA/p30 for semen, RSID and ABAcard immunochromatographic strips for saliva, mRNA profiling for tissue-of-origin, and the limits of each test in casework.15 min
- Touch DNA, Hair, Bone, Teeth and Challenging SubstratesHow a forensic biotechnologist handles the substrates that don't yield a clean blood-stain extract: shed epithelial cells (touch DNA), the difference between a rooted and a shed hair, bone powder and decalcification protocols, dental pulp recovery, and the stochastic effects that follow low template input.13 min
- DNA Extraction: Organic, Chelex, Silica-Column and Magnetic-BeadThe four extraction families every operational lab runs: phenol-chloroform organic extraction, Chelex 100 chelation of divalent cations, silica-column binding under chaotropic salt, and magnetic-bead automation on QIAcube, EZ1, Maxwell and Hamilton platforms, with a comparison of yield, purity and throughput.14 min
- Differential Extraction in Sexual-Assault CaseworkThe selective lysis that separates sperm-cell nuclei from epithelial-cell nuclei in mixed swabs: classical SDS / proteinase K differential extraction, the DNase-based variant, and the modern microfluidic and immunomagnetic separations (e.g., the Erase Sperm Isolation Kit) that reduce the female fraction in the male pellet.12 min
DNA quantification and PCR amplification
The molecular workhorse: UV, fluorometry, slot-blot and qPCR for quantitation; PCR fundamentals (chemistry, primers, thermal cycling, contamination control); and the multiplex STR kits, inhibitor handling and low-template DNA workflows operational labs run daily.
Start module- DNA Quantification: UV, Fluorometry, Slot-Blot and qPCRWhy quantitation precedes PCR in every accredited workflow: UV absorbance at A260/A280, fluorometry with PicoGreen and Qubit, slot-blot with QuantiBlot probes, and human-specific qPCR with Quantifiler Trio, Plexor HY and InnoQuant HY that report autosomal, Y and degradation indices in a single run.13 min
- PCR Fundamentals: Chemistry, Primers, Cycling and ContaminationThe three-temperature cycle that underwrites every modern DNA result: denaturation, annealing, extension; Taq polymerase, hot-start chemistries, primer design rules; and the contamination-control architecture (pre- and post-PCR rooms, UV decontamination, negative controls) that keeps a court-grade lab honest.14 min
- Multiplex STR Kits, Inhibitor Handling and Low-Template DNAThe kits behind every modern STR profile: Identifiler Plus, PowerPlex Fusion, GlobalFiler, Investigator 24plex, ESSplex SE QS; the inhibitor classes (haematin, humic acid, indigo, tannic acid) that crash PCR; and the low-template workflows (LCN, increased cycle number, post-PCR clean-up) that pull a profile from picograms.13 min
STR profiling, mixtures and forensic statistics
What an operational DNA examiner spends most days doing: capillary electrophoresis and electropherogram interpretation, the global locus standards (CODIS 20, ESS17, India's NDIS proposal), the statistical frame (allele frequencies, RMP, the likelihood ratio, the prosecutor's fallacy), and mixture deconvolution with probabilistic genotyping software.
Start module- Capillary Electrophoresis and Electropherogram InterpretationHow a multiplex PCR product becomes a numbered allele call: capillary electrophoresis on 3500 and 3130 platforms, the spectral matrix and dye channels, allelic ladder calibration, and the artefacts (stutter, pull-up, off-ladder alleles, drop-out, drop-in) that an examiner reads off the electropherogram.14 min
- CODIS 20, the European Standard Set and India's NDIS Locus StandardsThe global locus standards every DNA database aligns to: the 13 original CODIS loci, the 2017 expansion to CODIS 20, the European Standard Set (ESS17), India's NDIS panel proposal under the DNA Technology Bill 2019, and how the overlap between standards lets profiles cross borders in INTERPOL casework.12 min
- Allele Frequencies, Random Match Probability and the Likelihood RatioHow a profile turns into a number a jury can weigh: population allele-frequency databases, Hardy-Weinberg and theta correction, the product rule for RMP, the likelihood ratio framing favoured by ENFSI and SWGDAM, and the prosecutor's fallacy and defence attorney's fallacy that the People v. Simpson trial put on a global stage.15 min
- Mixture Deconvolution and Probabilistic GenotypingWhat an examiner does when three contributors appear in one swab: the classical mixture interpretation rules (number of contributors, allele sharing, peak-height ratios, stochastic threshold) and the probabilistic genotyping software (STRmix, TrueAllele, EuroForMix, LRmix Studio) that now handles 2-3 person mixtures across the US, UK, Australia and EU labs.14 min
Specialised DNA markers
Where autosomal STR fails: heavily degraded skeletal remains, hair shafts, ancient samples and complex pedigrees. Mitochondrial DNA on HV1/HV2 and the rCRS reference, Y-STR and X-STR profiling for lineage casework, and SNP panels for ancestry, phenotype and identification.
Start module- Mitochondrial DNA Sequencing on HV1/HV2 and the rCRS ReferenceWhy mtDNA wins when nuclear DNA is exhausted: the 16,569-base circular mitochondrial genome, the hypervariable regions HV1 and HV2, the revised Cambridge Reference Sequence (rCRS) and the Reconstructed Sapiens Reference Sequence (RSRS), heteroplasmy interpretation, and casework anchors (Romanov identification 1998, Anna Anderson, the Mengele identification 1985).13 min
- Y-STR and X-STR Profiling for Lineage and Complex PedigreesWhere autosomal STR fails to discriminate male contributors from a female-rich mixture or to reconstruct a paternal lineage: Y-STR multiplex panels (Yfiler Plus, PowerPlex Y23), the YHRD haplotype database, X-STR panels for father-daughter and grandparent-grandchild kinship, and the casework patterns each marker class anchors.13 min
- SNP Panels for Ancestry, Phenotype and IdentificationSingle-nucleotide polymorphism panels as the second-generation forensic marker class: identification SNPs (the FORENSeq DNA Signature Prep, the SNPforID consortium), ancestry-informative markers, externally-visible-characteristic panels (HIrisPlex-S for eye and hair colour), and the Parabon Snapshot phenotyping pipeline that drew faces from crime-scene DNA.14 min
Bioinformatics, sequence analysis and forensic phylogenetics
The computational layer that turns raw reads into a court-grade interpretation: sequence alignment, BLAST, GenBank, Mitomap, EMPOP; phylogenetics for species identification and lineage reconstruction; and the NGS data analysis stack (allele calling, variant callers, quality filters).
Start module- Sequence Alignment, BLAST, GenBank, Mitomap and EMPOPThe reference databases and alignment tools every NGS-era forensic analyst uses: pairwise and multiple sequence alignment (BLAST, Clustal Omega, MAFFT), GenBank for species ID, Mitomap and EMPOP for human mtDNA, and the YHRD population database for Y-STR haplotypes, with the quality-control rules each repository enforces.12 min
- Phylogenetics for Species Identification and Lineage ReconstructionHow a forensic biotechnologist places an unknown sequence on a tree: neighbour-joining, maximum likelihood and Bayesian phylogenetic methods, bootstrap support, the cytochrome-b and COI barcoding standards, and the wildlife-forensic and microbial-attribution cases that turned phylogenetics into court-admissible evidence.12 min
- NGS Data Analysis: Allele Calling, Variant Callers and Quality FiltersWhat happens between a sequencer's raw output and a reportable allele: read trimming, alignment to a reference (BWA, Bowtie2), variant calling (GATK, FreeBayes), forensic-specific tools (STRait Razor, FDSTools, MyFLq), coverage and balance filters, and the validation studies that turned MPS into an accredited forensic technique.14 min
Non-human forensics: species, wildlife, microbial, plant, diatom
Casework that is not human ID. Species identification by cytochrome-b, COI barcoding and 16S rRNA; wildlife forensics on ivory, tiger, pangolin and rhino seizures (CITES casework); microbial forensics and biothreat attribution; plant DNA, the paloverde-seed case and the diatom test in drowning.
Start module- Species Identification by Cytochrome-b, COI Barcoding and 16S rRNAThe mitochondrial and ribosomal markers that distinguish a tiger from a leopard, a beef adulterant from a horse-meat substitute, and one bacterial pathogen from another: cytochrome-b for vertebrates, the COI barcode of life, 16S rRNA for bacteria, ITS regions for fungi, and the BOLD Systems and SILVA reference databases.12 min
- Wildlife Forensics: Ivory, Tiger, Pangolin, Rhino and CITES CaseworkHow DNA evidence reaches a CITES prosecution: ivory geographic-origin attribution by elephant SNP and isotope panels, tiger and leopard mtDNA, pangolin scale and rhino horn species ID, and the wildlife-forensic laboratory network (US National Fish and Wildlife Forensics Laboratory, TRACE Network, Wildlife Institute of India, TRAFFIC).14 min
- Microbial Forensics: Anthrax Letters and Biothreat AttributionHow microbial sequencing built the case in Amerithrax: the morphotype variants of Bacillus anthracis Ames strain, the FBI-USAMRIID investigation, whole-genome sequencing-based attribution, the post-2001 build-out of the National Bioforensic Analysis Center, and the COVID-19-era sequencing capacity that put microbial forensics on every public-health agenda.13 min
- Plant DNA, the Paloverde-Seed Case and the Diatom Test in DrowningBotanical evidence at the bench: the State of Arizona v. Bogan 1992 paloverde-seed match that put plant DNA in front of a jury, chloroplast and ITS markers for plant species ID, palynology in linking soil to suspect, and the diatom test as the long-standing presumptive marker for drowning across Indian, UK and German post-mortem practice.12 min
DVI, kinship and emerging markers
What happens when DNA typing meets mass casualty, missing persons and the frontier of the science: INTERPOL Disaster Victim Identification and casework (2004 tsunami, 9/11 WTC, Air India 182, Air France 447, MH17); paternity and complex kinship; MPS and forensic genetic genealogy (the DeAngelo paradigm); and emerging markers (DNA methylation age estimation, miRNA body-fluid ID, cell-free DNA, HIrisPlex-S phenotyping).
Start module- Disaster Victim Identification: INTERPOL Process and CaseworkHow an organised forensic-biotech response to mass casualty actually works: the INTERPOL DVI Guide phases (scene, post-mortem, ante-mortem, reconciliation, debrief), the kinship and direct-match DNA workflows, and the landmark casework (2004 Indian Ocean tsunami, 9/11 World Trade Center, Air India 182, Air France 447, MH17, the 2018 Lombok and Sulawesi earthquakes).14 min
- Paternity, Complex Kinship and Missing-Persons CaseworkStatistical kinship at the bench: the trio paternity index, the duo (motherless) case, sibling and grandparental indices, kinship LR software (Familias, DNA-VIEW, FaSTaR, EasyDNA), and the missing-persons reference-sample design that anchors national missing-persons databases like NamUs (US), the UK Missing Persons Unit, and India's Track Child platform.13 min
- MPS, Forensic Genetic Genealogy and the DeAngelo ParadigmHow the Golden State Killer changed forensic biotech: massively parallel sequencing of STRs and SNPs (Verogen MiSeq FGx, Ion S5), the DeAngelo 2018 investigative-genetic-genealogy workflow, the GEDmatch and FamilyTreeDNA opt-in databases, third-cousin-network triangulation, and the US Department of Justice 2019 IGG interim policy that put guard-rails on the technique.16 min
- Emerging Markers: DNA Methylation, miRNA and HIrisPlex-S PhenotypingThe next-generation marker classes that promise to read age, body-fluid origin and visible traits from a swab: CpG methylation age estimation (the Horvath and ELOVL2 clocks), miRNA tissue-specific profiling for body-fluid identification, cell-free DNA in trace and antenatal forensic contexts, and the HIrisPlex-S externally-visible-characteristic panel for eye, hair and skin colour.15 min
Quality, ethics, databases and admissibility
The framework that decides whether the science holds up in court: ISO/IEC 17025, SWGDAM, ENFSI DNA WG and NABL accreditation; national DNA databases (NDIS, NDNAD, India's DNA Technology Bill 2019, EU Prüm decisions, GEDmatch); and admissibility plus ethics across jurisdictions (Daubert, Frye, BSA 2023 § 39, R v. Doheny, familial searching, genetic privacy, ELSI).
Start module- ISO/IEC 17025, SWGDAM, ENFSI and NABL AccreditationThe quality framework that turns a DNA result into court-admissible evidence: ISO/IEC 17025 lab accreditation, the SWGDAM interpretation guidelines (US), the ENFSI DNA Working Group documents (EU), NABL accreditation in Indian state and central FSLs, validation-study design, proficiency testing, and the audit trail every modern lab carries from sample receipt to expert-witness statement.12 min
- National DNA Databases: NDIS, NDNAD, India's Bill and EU PrumHow a profile becomes a database hit, and the laws that govern that database: the US National DNA Index System (NDIS), the UK National DNA Database (NDNAD), India's pending DNA Technology (Use and Application) Regulation Bill 2019, the EU Prüm decisions for cross-border DNA exchange, GEDmatch and FamilyTreeDNA on the opt-in side, and the retention and expungement debates each system has navigated.13 min
- Admissibility and Ethics: Daubert, Frye, R v. Doheny and ELSIHow DNA evidence is gate-kept by the world's courts: the US Frye standard (Frye v. United States 1923) and the Daubert standard (Daubert v. Merrell Dow 1993, Kumho Tire 1999), the UK R v. Doheny and Adams 1996 framework for expert-witness numbers, India's Bharatiya Sakshya Adhiniyam 2023 § 79 on opinion evidence, and the ethical, legal and social issues (ELSI) layer covering familial searching, genetic privacy and consent.15 min