Abstract
HOX genes encode a family of evolutionarily conserved homeodomain transcription factors that are crucial both during development and adult life. In humans, 39 HOX genes are arranged in four clusters (HOXA, B, C, and D) in chromosomes 7, 17, 12, and 2, respectively. During embryonic development, particular epigenetic states accompany their expression along the anterior–posterior body axis. This tightly regulated temporal–spatial expression pattern reflects their relative chromosomal localization, and is critical for normal embryonic brain development when HOX genes are mainly expressed in the hindbrain and mostly absent in the forebrain region. Epigenetic marks, mostly polycomb-associated, are dynamically regulated at HOX loci and regulatory regions to ensure the finely tuned HOX activation and repression, highlighting a crucial epigenetic plasticity necessary for homeostatic development. HOX genes are essentially absent in healthy adult brain, whereas they are detected in malignant brain tumours, namely gliomas, where HOX genes display critical roles by regulating several hallmarks of cancer. Here, we review the major mechanisms involved in HOX genes (de)regulation in the brain, from embryonic to adult stages, in physiological and oncologic conditions. We focus particularly on the emerging causes of HOX gene deregulation in glioma, as well as on their functional and clinical implications.
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Abbreviations
- 3C:
-
Chromosome conformation capture
- 3D:
-
Three-dimensional
- 4C-seq:
-
Circularized chromosome conformation capture with deep sequencing
- 5C:
-
Chromosome conformation capture carbon copy
- AQB:
-
AC1Q3QWB drug
- CAM:
-
Chicken chorioallantoic membrane
- CGGA:
-
Chinese Glioma Genome Atlas
- ChIP:
-
Chromatin immunoprecipitation
- CHROMO:
-
Chromatin organization modifier
- CNS:
-
Central nervous system
- CNV:
-
Copy-number variations
- COMPASS:
-
Complex proteins associated with Set1
- DNA:
-
Deoxyribonucleic acid
- ESCs:
-
Embryonic stem cells
- GBM:
-
Glioblastoma
- G-CIMP:
-
Glioma CpG island methylator phenotype
- GSCs:
-
GBM stem cells
- H2AK119ub:
-
Ubiquitination of H2AK119 residues
- H3K27ac:
-
Histone H3 lysine 27 acetylation
- H3K27me3:
-
Histone H3 lysine 27 trimethylation
- H3K4me3:
-
Histone H3 lysine 4 trimethylation
- Hi-C:
-
Chromosome capture followed by high-throughput sequencing
- HOX:
-
Homeobox
- HUVEC:
-
Human umbilical vein endothelial cells
- lncRNA:
-
Long non-coding RNA
- miRNAs:
-
Micro-RNA
- mRNA:
-
Messenger RNA
- OS:
-
Overall survival
- PARs:
-
Promoter-associated RNAs
- PcG:
-
Polycomb group
- PCR:
-
Polymerase chain reaction
- PDX:
-
Patient-derived xenograft
- PRE:
-
Polycomb-responsive element
- RA:
-
Retinoic acid
- RNA:
-
Ribonucleic acid
- SINE:
-
Short interspersed nuclear elements
- TAD:
-
Topological associating domain
- TCGA:
-
The Cancer Genome Atlas
- TMZ:
-
Temozolomide
- TrxG:
-
Trithorax-group proteins
- TSS:
-
Transcription start sites
- WHO:
-
World Health Organization
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Gonçalves, C.S., Le Boiteux, E., Arnaud, P. et al. HOX gene cluster (de)regulation in brain: from neurodevelopment to malignant glial tumours. Cell. Mol. Life Sci. 77, 3797–3821 (2020). https://doi.org/10.1007/s00018-020-03508-9
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DOI: https://doi.org/10.1007/s00018-020-03508-9