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SASH3
SAM and SH3 domain containing 3
SASH3 is located on the long (q) arm of chromosome X, at band Xq26.1. Arm ratio per GRCh38 - banding schematic.
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Overview
SASH3 (SAM and SH3 domain containing 3) encodes a protein characterised by the presence of two conserved structural modules: a SAM domain and an SH3 domain. These domains typically mediate protein-protein interactions and are found in many signalling proteins across human biology. The gene is situated on the X chromosome at position Xq26.1, a region that contains numerous genes important for cellular regulation.
Currently, the specific cellular pathways regulated by SASH3 and its contribution to human health or disease are not fully characterised. The protein is thought to function in intracellular signalling networks, potentially coordinating communication between different molecular pathways, but further research is needed to clarify its precise biological activities and clinical relevance.
What the gene does
The SASH3 protein belongs to a family of signalling adaptors defined by the presence of interaction domains. Proteins containing SAM (Sterile Alpha Motif) and SH3 (Src Homology 3) domains typically serve as molecular scaffolds, bringing together different signalling components within the cell. These domains enable the protein to recognise and bind specific partner molecules, facilitating the assembly of larger signalling complexes.
SAM domains generally mediate both protein-protein interactions and, in some contexts, protein-RNA binding. SH3 domains typically recognise proline-rich sequences in target proteins, allowing them to recruit specific binding partners. Through these interaction capabilities, SASH3 may coordinate cellular responses to external signals or internal regulatory cues.
The tissues and developmental stages in which SASH3 expression is most critical have not been extensively documented. Ongoing research continues to explore which cellular pathways depend on SASH3 function and how alterations in this gene might influence cellular behaviour.
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Chromosome location
SASH3 is located on the long arm of the X chromosome at cytogenetic band Xq26.1. This chromosomal position places it in the distal portion of the X chromosome, a region that contains genes with diverse functions. Because SASH3 resides on the X chromosome, patterns of inheritance and expression may differ between males and females due to X-chromosome inactivation in female cells.
The precise number of exons and the complete genomic structure of SASH3 have not been detailed in standard reference databases, reflecting the early stage of research into this gene.
Protein structure
Domain architecture has not been experimentally characterised in detail for this protein. While the gene name indicates the presence of SAM and SH3 domains based on sequence analysis, comprehensive structural studies mapping the precise boundaries, three-dimensional arrangements, and functional properties of these domains have not been widely reported. The protein length and detailed domain organisation remain subjects for further investigation.
Key variants
Genetic variants in SASH3 have been identified through large-scale sequencing efforts, but the clinical significance of most changes remains uncertain. Because the normal function of SASH3 is not yet fully understood, interpreting the impact of specific variants presents challenges. Variants may include missense changes affecting individual amino acids, as well as deletions or insertions that alter the protein sequence.
As research progresses and more individuals with SASH3 variants are studied, the medical community will develop a clearer picture of which changes affect protein function and whether they contribute to specific clinical presentations.
No pathogenic or likely-pathogenic ClinVar variants recorded yet for this gene.
Associated conditions
Currently, no specific inherited conditions have been definitively linked to pathogenic variants in SASH3. The gene has not been incorporated into established clinical testing panels used by the NHS Genomic Medicine Service, reflecting the absence of clear disease associations at this time.
It remains possible that future research will identify clinical phenotypes associated with SASH3 dysfunction. As genetic testing becomes more comprehensive and rare disease registries expand, previously unrecognised gene-disease relationships continue to emerge across human genetics.
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 SASH3 gene do?
SASH3 encodes a protein with SAM and SH3 domains that are thought to mediate protein-protein interactions in cellular signalling pathways. However, its specific molecular functions and the biological processes it regulates have not been fully established through research.
Is SASH3 linked to any medical conditions?
No specific inherited conditions have been definitively associated with SASH3 variants at this time. The gene is not currently included in NHS clinical testing panels, reflecting the absence of established disease links.
Why is SASH3 located on the X chromosome?
SASH3 resides at position Xq26.1 on the X chromosome, meaning it is inherited as part of the sex chromosome complement. This location may result in different expression patterns between males and females due to X-chromosome inactivation processes in female cells.