HOXA11‑AS1 (Homeobox A11 Antisense RNA 1) is a long non‑coding RNA (lncRNA) that is transcribed from the antisense strand of the HOXA11 gene locus. It is located on human chromosome 7p15.2 within the HOXA cluster, a region that contains multiple homeobox genes involved in embryonic development and patterning.
Genomic Context
- Gene symbol: HOXA11‑AS1
- Chromosomal location: 7p15.2 (GRCh38/hg38 coordinates 22,917,342‑22,920,678)
- Biotype: Long non‑coding RNA (lncRNA)
- Orientation: Antisense to the protein‑coding HOXA11 gene
Molecular Characteristics
- The transcript is spliced, polyadenylated, and lacks an open reading frame capable of producing a functional protein.
- It is believed to regulate gene expression through mechanisms typical of antisense lncRNAs, such as chromatin remodeling, transcriptional interference, or microRNA sponging.
Biological Functions and Clinical Relevance
- Developmental role: As part of the HOXA cluster, HOXA11‑AS1 is implicated in the regulation of developmental processes, although its precise physiological functions remain under investigation.
- Cancer association: Several studies have reported dysregulated expression of HOXA11‑AS1 in various malignancies, including:
- Breast cancer: Overexpression correlated with increased proliferation and migration of cancer cells; knockdown reduced tumorigenic phenotypes in vitro.
- Gastric cancer: Elevated levels associated with poor prognosis; functional assays suggest a role in promoting epithelial‑mesenchymal transition (EMT).
- Lung adenocarcinoma: Reported to act as a competing endogenous RNA (ceRNA) by sponging microRNA‑124‑3p, thereby up‑regulating target oncogenes.
- Mechanistic insights: The lncRNA is proposed to interact with chromatin‑modifying complexes and to function as a molecular scaffold, influencing the expression of HOXA11 and neighboring genes, as well as distal targets via miRNA sequestration.
Research Status
- The functional characterization of HOXA11‑AS1 is ongoing. While multiple in vitro and tumor‑sample analyses suggest oncogenic roles, comprehensive in vivo models and mechanistic pathways have not been fully elucidated.
- Databases such as NCBI Gene, Ensembl, and lncRNA-specific repositories list HOXA11‑AS1 as a curated transcript, providing sequence data and expression profiles across normal and disease tissues.
References
- Peer‑reviewed articles cataloguing HOXA11‑AS1 expression in specific cancers (e.g., Oncotarget, Molecular Cancer, Journal of Cellular Physiology).
- Gene and transcript annotations from NCBI Gene (Gene ID: 100302104) and Ensembl (ENSG0000021373).
Note: The information presented reflects current knowledge from peer‑reviewed literature and reputable genomic databases up to the knowledge cutoff date.
