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NSMCE3
NSE3 component of SMC5/6 complex
NSMCE3 is located on the long (q) arm of chromosome 15, at band 15q13.1. Arm ratio per GRCh38 - banding schematic.
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Overview
NSMCE3 resides on chromosome 15 and encodes the NSE3 protein, a non-structural maintenance of chromosomes (non-SMC) element within the SMC5/6 complex. This multi-subunit assembly functions in DNA repair pathways and chromosome segregation, particularly during conditions of replication stress. The SMC5/6 complex coordinates responses to DNA damage and helps resolve complex DNA structures that can form when replication forks stall or collapse. NSE3 contributes to the stability and regulatory functions of this complex, supporting genome maintenance across the cell cycle. Research into NSMCE3 remains focused on understanding its precise molecular contributions to chromosome dynamics.
What the gene does
The NSE3 protein functions as a regulatory component within the SMC5/6 complex, which participates in homologous recombination repair and the resolution of DNA replication intermediates. This complex becomes particularly important when cells encounter obstacles during DNA synthesis, such as damaged bases or secondary structures that impede the replication machinery. NSE3 works alongside other non-SMC elements and the core SMC5 and SMC6 proteins to facilitate DNA repair processes that prevent chromosome breakage and rearrangement.
The SMC5/6 complex helps manage topological challenges that arise during DNA metabolism, including the disentanglement of sister chromatids before cell division. NSE3 appears to support the enzymatic activities of the complex and may influence how the assembly recognises and binds to specific DNA structures. Evidence suggests the protein contributes to maintaining genomic stability by coordinating responses to replication-associated DNA lesions, though the detailed mechanisms through which NSE3 regulates complex function continue to be investigated.
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Chromosome location
NSMCE3 is located on the long arm of chromosome 15 at band 13.1, designated cytogenetically as 15q13.1. This region contains multiple genes involved in diverse cellular processes. The precise number of exons and detailed transcript structure for NSMCE3 have not been extensively characterised in publicly available databases, though the gene produces at least one protein-coding transcript that encodes the NSE3 subunit.
Protein structure
Domain architecture has not been experimentally characterised in detail for this protein.
Key variants
Genetic variation in NSMCE3 has not been extensively studied in clinical populations, and the functional impact of most sequence changes in this gene remains unclear. Because the gene plays a role in fundamental DNA maintenance processes, alterations that disrupt NSE3 function could theoretically affect genome stability, though specific disease associations have not been firmly established. The clinical significance of variants identified through genetic testing depends on their location within the gene and their predicted effect on protein structure or expression.
No pathogenic or likely-pathogenic ClinVar variants recorded yet for this gene.
Associated conditions
NSMCE3 has not been definitively linked to specific inherited conditions in clinical genetics literature. The gene's role in DNA repair suggests that severe loss of function could potentially contribute to genomic instability phenotypes, but no well-defined syndrome has been attributed to NSMCE3 variants in large-scale clinical studies. Research continues to explore whether variation in this gene may contribute to susceptibility to DNA damage or cellular dysfunction under particular circumstances.
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 SMC5/6 complex do?
The SMC5/6 complex is a protein assembly that helps cells repair DNA damage and manage chromosome structure during replication. It becomes particularly important when DNA replication encounters obstacles, helping to resolve stalled replication forks and prevent chromosome breakage.
Is genetic testing for NSMCE3 routinely available?
NSMCE3 is not currently included in standard clinical genetic testing panels in the UK, as the gene has not been firmly associated with specific inherited conditions. Testing may be performed in research settings or through comprehensive genomic sequencing, but clinical interpretation of variants remains limited.
How common are NSMCE3 variants?
The frequency of genetic variants in NSMCE3 in the general population has not been systematically characterised, and the clinical significance of most variants remains uncertain. Because the gene has not been linked to recognised inherited conditions, population-level carrier screening does not currently include NSMCE3.