Juříčková, Iva, Hudec, Michael, Votava, Felix, Vosáhlo, Jan, Ovsepian, Saak, Černá, Marie and O'Leary, Valerie (2022) The immunological epigenetic landscape of the human life trajectory. Biomedicines, 10 (11):2894. ISSN 2227-9059 (Online) (doi:10.3390/biomedicines10112894)

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Abstract

Adaptive immunity changes over an individual's lifetime, maturing by adulthood and diminishing with old age. Epigenetic mechanisms involving DNA and histone methylation form the molecular basis of immunological memory during lymphocyte development. Monocytes alter their function to convey immune tolerance, yet the epigenetic influences at play remain to be fully understood in the context of lifespan. This study of a healthy genetically homogenous cohort of children, adults and seniors sought to decipher the epigenetic dynamics in B-lymphocytes and monocytes. Variable global cytosine methylation within retro-transposable LINE-1 repeats was noted in monocytes compared to B-lymphocytes across age groups. The expression of the human leukocyte antigen (HLA)-DQ alpha chain gene HLA-DQA1*01 revealed significantly reduced levels in monocytes in all ages relative to B-lymphocytes, as well as between lifespan groups. High melting point analysis and bisulfite sequencing of the HLA-DQA1*01 promoter in monocytes highlighted variable cytosine methylation in children and seniors but greater stability at this locus in adults. Further epigenetic evaluation revealed higher histone lysine 27 trimethylation in monocytes from this adult group. Chromatin immunoprecipitation and RNA pulldown demonstrated association with a novel lncRNA TINA with structurally conserved similarities to the previously recognized epigenetic modifier PARTICLE. Seeking to interpret the epigenetic immunological landscape across three representative age groups, this study focused on HLA-DQA1*01 to expose cytosine and histone methylation alterations and their association with the non-coding transcriptome. Such insights unveil previously unknown complex epigenetic layers, orchestrating the strength and weakening of adaptive immunity with the progression of life.

Item Type:	Article
Additional Information:	This article belongs to the Special Issue Epigenetic Regulation of the Immune System.
Uncontrolled Keywords:	ChIP; HLA; PARTICLE; TINA; histone; long non-coding RNA; methylation
Subjects:	Q Science > Q Science (General) Q Science > QR Microbiology > QR355 Virology
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > Biomedical Science Research Group Faculty of Engineering & Science > School of Science (SCI)
Last Modified:	06 Dec 2022 16:31
URI:	http://gala.gre.ac.uk/id/eprint/38217

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