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NONO
non-POU domain containing octamer binding
NONO is located on the long (q) arm of chromosome X, at band Xq13.1. Arm ratio per GRCh38 - banding schematic.
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Overview
The NONO gene, whose name stands for non-POU domain containing octamer binding, encodes a nuclear protein with diverse regulatory functions. This protein operates primarily within the nucleus, where it coordinates multiple cellular processes essential for normal cell function. NONO participates in RNA splicing, transcriptional regulation, and DNA repair pathways.
As an X-linked gene located at position Xq13.1, NONO follows X-chromosome inheritance patterns. The protein it produces serves as a molecular scaffold, bringing together different cellular components to facilitate complex biochemical processes. Research into NONO continues to reveal its importance in maintaining cellular health and coordinating responses to various cellular stresses.
What the gene does
The NONO protein functions as a multifunctional nuclear factor involved in several critical cellular pathways. One of its primary roles involves RNA processing, where it participates in splicing pre-messenger RNA molecules into their mature forms. This activity helps determine which parts of genetic information are ultimately translated into proteins.
Beyond RNA metabolism, NONO contributes to transcriptional regulation by interacting with various transcription factors and chromatin-modifying complexes. These interactions influence whether specific genes are switched on or off in response to cellular signals. The protein also participates in DNA damage response pathways, helping cells detect and respond to breaks in the DNA double helix.
NONO often works in partnership with other nuclear proteins, forming complexes that coordinate multiple cellular activities simultaneously. This scaffold function allows the protein to integrate signals from different cellular pathways and coordinate appropriate cellular responses. The protein's diverse functions highlight its importance in maintaining normal cellular operations across different tissues and developmental stages.
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Chromosome location
The NONO gene is located on the X chromosome at cytogenetic band Xq13.1, placing it in the long arm of the chromosome. This X-linked location means that males, who possess only one X chromosome, have a single copy of the gene, whilst females carry two copies. The chromosomal position places NONO amongst other genes with diverse functions, and its X-linked status influences how variants in the gene may be inherited and expressed across generations.
Protein structure
Domain architecture has not been experimentally characterised in detail for this protein. The NONO protein contains RNA-binding motifs that enable it to interact with RNA molecules, as well as regions that facilitate protein-protein interactions necessary for its scaffold functions. The precise structural organisation that underlies its multifunctional capabilities remains an area of ongoing structural biology research.
Key variants
Genetic variants in NONO can affect the protein's ability to carry out its multiple cellular functions. Changes that alter the protein sequence may impact RNA binding, protein interactions, or localisation within the nucleus. The inheritance pattern for NONO variants varies depending on the specific genetic change and its functional consequences. Because NONO resides on the X chromosome, variant interpretation may differ between males and females, with males potentially showing different clinical presentations due to their single gene copy.
Sample of pathogenic variants
10 pathogenic / likely-pathogenic variants from ClinVar, ranked by review status (expert-panel-reviewed first). This is a sample; recurrent founder variants in a specific population may not appear here - see the full ClinVar listing via the link above.
| Variant (HGVS) | Protein change | Classification | Evidence | Associated condition |
|---|---|---|---|---|
c.1131G>A | p.Ala377= | Pathogenic | ★★☆☆ | Syndromic X-linked intellectual disability 34 |
c.550C>T | p.Arg184Ter | Pathogenic | ★★☆☆ | Syndromic X-linked intellectual disability 34 |
c.1071dup | p.Gln358fs | Pathogenic | ★☆☆☆ | not provided |
c.1131+1G>A | - | Pathogenic | ★☆☆☆ | See cases |
c.201_202dup | p.Lys68fs | Pathogenic | ★☆☆☆ | Syndromic X-linked intellectual disability 34 |
c.205_206del | p.Thr69fs | Pathogenic | ★☆☆☆ | Syndromic X-linked intellectual disability 34 |
c.279_282del | p.Phe94fs | Pathogenic | ★☆☆☆ | Syndromic X-linked intellectual disability 34 |
c.298_307del | p.Ala100fs | Pathogenic | ★☆☆☆ | Syndromic X-linked intellectual disability 34 |
c.348+2_348+15del | - | Pathogenic | ★☆☆☆ | Non-ossifying fibromas with pathologic factures and X-linked intellectual disability |
c.710del | p.Pro237fs | Pathogenic | ★☆☆☆ | Neurodevelopmental delay |
Evidence stars indicate ClinVar review status. Individual variant interpretation should always be performed by a qualified clinical laboratory - many variants remain classified as Variants of Uncertain Significance (VUS) pending more research.
Associated conditions
Currently, no specific inherited conditions have been formally associated with NONO variants in major clinical genetics databases. Research into the gene's cellular functions suggests it plays important roles in fundamental processes, and ongoing studies continue to investigate potential links between NONO dysfunction and human disease. As genetic research advances, the relationship between NONO variants and clinical phenotypes may become clearer, potentially leading to recognition of associated conditions in the future.
No disease links recorded for this gene in our reference set.
UK clinical status
Sources: NHS GMS PanelApp · Genomics England PanelApp · NHS National Genomic Test Directory
Frequently asked questions
What does the NONO protein do in cells?
The NONO protein performs multiple roles within the cell nucleus, including processing RNA molecules, regulating gene expression, and participating in DNA repair pathways. It acts as a scaffold protein that brings different cellular components together to coordinate complex processes.
Why is NONO located on the X chromosome significant?
The X-chromosome location means males have only one copy of NONO whilst females have two copies. This influences how genetic variants in the gene may be inherited and how they might affect individuals differently based on biological sex.
Are there known conditions associated with NONO variants?
Currently, no specific inherited conditions have been formally linked to NONO variants in major clinical genetics databases, though research into the gene's functions continues. As genetic research advances, associations between NONO changes and clinical presentations may be identified.