Dataset Information

Stability of hair proteomes and proteomic genotyping with age and time

ABSTRACT: Hair, a skin appendage, is a frequently procured biological specimen from crime scenes and has been used in forensic investigations for over a century. Proteomic analysis and identification of genetically variant peptides (GVPs) in hair samples for identification purposes is a recent but an efficiently advancing tool for forensic and archeological uses. However, the hair samples exposed to environmental insults have been seen to undergo degradation to various degrees depending on the physicochemical factors the samples have been exposed to. Therefore, one would expect that evidentiary hair samples stored for longer periods of time will undergo alterations in their proteomes and hence can affect their use on long-term samples stored as case work. To determine the degree to which age of individual or age of sample can affect the hair shaft proteome or inferred GVP profile, protein profiles of hair samples were compared from individuals of different ages as well as samples collected from same individual at different time points and stored in dry environment at room temperature for 5 - 65 years.

INSTRUMENT(S): Q Exactive

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Hair Shaft

SUBMITTER: Glendon Parker

LAB HEAD: Glendon John Parker

PROVIDER: PXD016169 | Pride | 2020-06-10

REPOSITORIES: Pride

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Publications

Age-Related Changes in Hair Shaft Protein Profiling and Genetically Variant Peptides.

Plott Tempest J TJ Karim Noreen N Durbin-Johnson Blythe P BP Swift Dionne P DP Scott Youngquist R R Salemi Michelle M Phinney Brett S BS Rocke David M DM Davis Michael G MG Parker Glendon J GJ Rice Robert H RH

Forensic science international. Genetics 20200522

Recent reports highlight possible improvements in individual identification using proteomic information from human hair evidence. These reports have stimulated investigation of parameters that affect the utility of proteomic information. In addition to variables already studied relating to processing technique and anatomic origin of hair shafts, an important variable is hair ageing. Present work focuses on the effect of age on protein profiling and analysis of genetically variant peptides (GVPs) ...[more]

PMID: 32485593

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Project description:Increasing evidence suggests that microRNAs may play important roles in regulating self-renewal and differentiation in mammalian stem cells (SCs). Here, we explore this issue in skin. We first characterize microRNA expression profiles of skin SCs versus their committed proliferative progenies and identify a microRNA subset associating with “stemness”. Of these, miR-125b is dramatically downregulated in early SC-progeny. We engineer an inducible mice system and show that when miR-125b is sustained in SC-progenies, tissue balance is reversibly skewed towards stemness at the expense of epidermal, oil-gland and HF differentiation. Using gain-and-loss of function in vitro, we further implicate miR-125b as a repressor of SC differentiation. In vivo, transcripts repressed upon miR-125b induction are enriched >700% for predicted miR-125b targets normally downregulated upon SC-lineage commitment. We verify some of these miR-125b targets, and show that Blimp1 and VDR in particular can account for many tissue imbalances we see when miR-125b is deregulated. We used microarrays to compare the global miRNA expression profile of P4 stage hair follicle ORS cells from DTG (K14-rtTA,TRE-miR-125b) and control littermates. Hair follicle cells were isolated from P4 Backskin (Dox since P3 for 24hrs) of DTG (K14-rtTA/TRE-miR-125b/K14-H2BGFP), TRE (TRE-miR-125b/K14-H2BGFP), KrtA (K14-rtTA/K14-H2BGFP) as following: interfollicular epidermis sheet was pealed from hair follicle & dermis after dispase treatment.The hair follicle & dermis were first digested by collagenase (Sigma). Intact hair follicles were separated from dermal cells by low speed spinning (20g). The hair follicles were then digested by Trypsin and filtered by 40 µm cell strainers. The isolated hair follicle cells were FACS sorted. During FACS, cells were first gated against CD34 (endothelial cells), CD45 (immune cells), CD114 (melanocytes) and DAPI (dead cells). ORS cells were sorted from the remaining cells as α6HiGFPHi.

Dataset Information

Stability of hair proteomes and proteomic genotyping with age and time

Publications

Age-Related Changes in Hair Shaft Protein Profiling and Genetically Variant Peptides.

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