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International journal of molecular sciences2022; 24(1); 561; doi: 10.3390/ijms24010561

The Enrichment of Specific Hair Follicle-Associated Cell Populations in Plucked Hairs Offers an Opportunity to Study Gene Expression Underlying Hair Traits.

Abstract: Gene expression differences can assist in characterizing important underlying genetic mechanisms between different phenotypic traits. However, when population-dense tissues are studied, the signals from scarce populations are diluted. Therefore, appropriately choosing a sample collection method that enriches a particular type of effector cells might yield more specific results. To address this issue, we performed a polyA-selected RNA-seq experiment of domestic horse () plucked-hair samples and skin biopsies. Then, we layered the horse gene abundance results against cell type-specific marker genes generated from a scRNA-seq supported with spatial mapping of laboratory mouse () skin to identify the captured populations. The hair-plucking and skin-biopsy sample-collection methods yielded comparable quality and quantity of RNA-seq results. Keratin-related genes, such as KRT84 and KRT75, were among the genes that showed higher abundance in plucked hairs, while genes involved in cellular processes and enzymatic activities, such as MGST1, had higher abundance in skin biopsies. We found an enrichment of hair-follicle keratinocytes in plucked hairs, but detected an enrichment of other populations, including epidermis keratinocytes, in skin biopsies. In mammalian models, biopsies are often the method of choice for a plethora of gene expression studies and to our knowledge, this is a novel study that compares the cell-type enrichment between the non-invasive hair-plucking and the invasive skin-biopsy sample-collection methods. Here, we show that the non-invasive and ethically uncontroversial plucked-hair method is recommended depending on the research question. In conclusion, our study will allow downstream -omics approaches to better understand integumentary conditions in both health and disease in horses as well as other mammals.
Publication Date: 2022-12-29 PubMed ID: 36614000PubMed Central: PMC9820680DOI: 10.3390/ijms24010561Google Scholar: Lookup
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  • Journal Article

Summary

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The research compares two methods of sample collection – hair plucking and skin biopsies, across domestic horses and lab mice – and analyses their effectiveness in studying gene expression related to hair traits.

Objective of the Research

  • The goal of this study was to compare plucked hair samples versus skin biopsies for studying gene expression in relation to hair traits. The approach taken includes leveraging a polyA-selected RNA-seq experiment on domestic horse hair samples and skin biopsies, and using these data to identify the capture of specific cell populations.

Methods and Techniques

  • Gene abundance results obtained from the RNA-seq experiment with horse samples were compared with cell-type-specific marker genes identified through single cell RNA-sequencing (scRNA-seq) and spatial mapping of lab mouse skin.
  • Both hair-plucking and skin-biopsy sample collection methods were used, and the quality and quantity of RNA-seq results from both methods were compared.

Key Findings

  • Keratin-related genes (KRT84 and KRT75) showed higher abundance in plucked horse hair samples, while genes involved in cellular processes and enzymatic activities (MGST1) had higher abundance in skin biopsies.
  • There was a marked enrichment of hair-follicle keratinocytes in plucked hairs, but an enrichment of other cell types, such as epidermis keratinocytes, was found in skin biopsies.
  • The researchers established that both methods, hair-plucking (a non-invasive method) and skin biopsy (an invasive method), yielded comparable results, depending on the research question at hand.

Implications and Conclusions

  • This research is a novel study that compares the enrichment of certain cell types between non-invasive and invasive sample-collection methods.
  • The research team concluded that the non-invasive and ethically acceptable hair plucking method should be recommended depending on the focus of the research question. This finding could change the way skin and hair diseases are studied in not only horses but in other mammals as well.
  • The conclusions derived from this study will enhance future omics approaches aimed at better understanding integumentary conditions in both health and disease in mammals.

Cite This Article

APA
Naboulsi R, Cieślak J, Headon D, Jouni A, Negro JJ, Andersson G, Lindgren G. (2022). The Enrichment of Specific Hair Follicle-Associated Cell Populations in Plucked Hairs Offers an Opportunity to Study Gene Expression Underlying Hair Traits. Int J Mol Sci, 24(1), 561. https://doi.org/10.3390/ijms24010561

Publication

ISSN: 1422-0067
NlmUniqueID: 101092791
Country: Switzerland
Language: English
Volume: 24
Issue: 1
PII: 561

Researcher Affiliations

Naboulsi, Rakan
  • Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, 750 07 Uppsala, Sweden.
Cieślak, Jakub
  • Department of Genetics and Animal Breeding, Poznan University of Life Sciences, 60-637 Poznań, Poland.
Headon, Denis
  • The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Edinburgh EH25 9RG, UK.
Jouni, Ahmad
  • Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, 750 07 Uppsala, Sweden.
Negro, Juan J
  • Department of Evolutionary Ecology, Doñana Biological Station, CSIC, 41092 Seville, Spain.
Andersson, Göran
  • Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, 750 07 Uppsala, Sweden.
Lindgren, Gabriella
  • Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, 750 07 Uppsala, Sweden.
  • Center for Animal Breeding and Genetics, Department of Biosystems, KU Leuven, 3001 Leuven, Belgium.

MeSH Terms

  • Animals
  • Mice
  • Epidermis
  • Gene Expression
  • Hair
  • Hair Follicle / metabolism
  • Horses
  • Keratinocytes / metabolism

Grant Funding

  • 2016-04361 and 2020-03375 / The Swedish Research Council (VR)

Conflict of Interest Statement

The authors declare no conflict of interest.

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Citations

This article has been cited 3 times.
  1. He X, Qin Z, Teng R, Tian M, Wang W, Feng Y, Chen H, He H, Zhang H, Liu D, Jiang X. Characterization of Growth Secondary Hair in Min Pig Activated by Follicle Stem Cell Stimulated by Wnt and BMP Signaling Pathway. Animals (Basel) 2023 Apr 3;13(7).
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