Skip to main content
Log in

Epimutation in inherited metabolic disorders: the influence of aberrant transcription in adjacent genes

  • Review
  • Published:
Human Genetics Aims and scope Submit manuscript

Abstract

Epigenetic diseases can be produced by a stable alteration, called an epimutation, in DNA methylation, in which epigenome alterations are directly involved in the underlying molecular mechanisms of the disease. This review focuses on the epigenetics of two inherited metabolic diseases, epi-cblC, an inherited metabolic disorder of cobalamin (vitamin B12) metabolism, and alpha-thalassemia type α-ZF, an inherited disorder of α2-globin synthesis, with a particular interest in the role of aberrant antisense transcription of flanking genes in the generation of epimutations in CpG islands of gene promoters. In both disorders, the epimutation is triggered by an aberrant antisense transcription through the promoter, which produces an H3K36me3 histone mark involved in the recruitment of DNA methyltransferases. It results from diverse genetic alterations. In alpha-thalassemia type α-ZF, a deletion removes HBA1 and HBQ1 genes and juxtaposes the antisense LUC7L gene to the HBA2 gene. In epi-cblC, the epimutation in the MMACHC promoter is produced by mutations in the antisense flanking gene PRDX1, which induces a prolonged antisense transcription through the MMACHC promoter. The presence of the epimutation in sperm, its transgenerational inheritance via the mutated PRDX1, and the high expression of PRDX1 in spermatogonia but its nearly undetectable transcription in spermatids and spermatocytes, suggest that the epimutation could be maintained during germline reprogramming and despite removal of aberrant transcription. The epivariation seen in the MMACHC promoter (0.95 × 10–3) is highly frequent compared to epivariations affecting other genes of the Online Catalog of Human Genes and Genetic Disorders in an epigenome-wide dataset of 23,116 individuals. This and the comparison of epigrams of two monozygotic twins suggest that the aberrant transcription could also be influenced by post-zygotic environmental exposures.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Fig. 1
Fig. 2
Fig. 3
Fig. 4

Similar content being viewed by others

Availability of data and material

Data sharing does not apply to this article as no datasets were generated during the current study.

Code availability

Not applicable.

References

Download references

Funding

The study was funded by the research project FHU ARRIMAGE and the French PIA project GEENAGE of “Lorraine Université d’Excellence”, reference ANR-15-IDEX-04-LUE and the equipment of the genomic platform of UMRS1256 NGERE/UMS208 by the CPER IT2MP (Contrat Plan État Région, Innovations Technologiques, Modélisation and Médecine Personnalisée) and FEDER (Fonds européen de développement régional) (Grant number: ITM2P).

Author information

Authors and Affiliations

Authors

Contributions

Main drafting of the manuscript: JLG. Acquisition, analysis, or interpretation of data: JLG, AO, YS, RMG-R. Critical revision of the manuscript: all authors.

Corresponding author

Correspondence to Jean-Louis Guéant.

Ethics declarations

Conflict of interest

The authors have no competing interests to declare.

Ethics approval

Not applicable.

Consent to participate

Not applicable.

Consent for publication

Not applicable.

Additional information

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Supplementary Information

Below is the link to the electronic supplementary material.

Supplementary file1 (DOCX 15 KB)

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Guéant, JL., Siblini, Y., Chéry, C. et al. Epimutation in inherited metabolic disorders: the influence of aberrant transcription in adjacent genes. Hum Genet 141, 1309–1325 (2022). https://doi.org/10.1007/s00439-021-02414-9

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s00439-021-02414-9

Navigation