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SCAPER
S-phase cyclin A associated protein in the ER
SCAPER is located on the long (q) arm of chromosome 15, at band 15q24.3. Arm ratio per GRCh38 - banding schematic.
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Overview
SCAPER (S-phase cyclin A associated protein in the ER) is located on chromosome 15 at band q24.3 and encodes a protein implicated in the coordination of cell cycle progression with endoplasmic reticulum biology. The gene's name reflects the protein's association with cyclin A during S-phase, the portion of the cell cycle when DNA replication occurs, and its localisation to the endoplasmic reticulum membrane system. Variants in SCAPER have been reported in individuals with neurodevelopmental disorders and cerebellar abnormalities, though the full spectrum of associated phenotypes continues to be characterised. The inheritance pattern can vary depending on the specific variant and clinical context.
What the gene does
The SCAPER protein is thought to function at the intersection of cell cycle control and endoplasmic reticulum homeostasis. During S-phase of the cell cycle, when chromosomal DNA is duplicated, SCAPER may help coordinate the cellular response to replication stress and maintain proper endoplasmic reticulum architecture. The endoplasmic reticulum serves as the primary site for protein folding, lipid synthesis, and calcium storage within cells, and disruptions to its function can trigger stress responses that affect cell survival and differentiation.
Whilst the precise molecular mechanisms remain under investigation, SCAPER appears to participate in signalling pathways that sense cellular stress and adjust the pace of cell division accordingly. This regulatory function may be particularly important in developing neurons and other specialised cell types that require careful coordination between proliferation, differentiation, and organelle biogenesis. Loss or alteration of SCAPER function could therefore impair normal brain development and cerebellar maturation.
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Chromosome location
SCAPER is located on the long arm of chromosome 15 at cytogenetic band 15q24.3. This chromosomal region contains numerous genes, and microdeletions or duplications affecting 15q24 have been associated with developmental disorders, though SCAPER-specific contributions to regional genomic syndromes require further clarification. The genomic structure of SCAPER, including the number and organisation of its exons, has not been comprehensively detailed in widely accessible databases.
Protein structure
Domain architecture has not been experimentally characterised in detail for this protein. Whilst the name indicates association with cyclin A and localisation to the endoplasmic reticulum, specific functional motifs, binding domains, or structural modules have not been annotated in major protein structure databases. Further biochemical and structural studies will be needed to map the regions responsible for protein-protein interactions, membrane association, and cell cycle-dependent regulation.
Key variants
Pathogenic variants in SCAPER have been identified in individuals with neurological phenotypes, including developmental delay, intellectual disability, and cerebellar atrophy or hypoplasia. The variant spectrum and their functional consequences are still being defined as additional cases are reported. Inheritance can be autosomal recessive or, in some instances, involve de novo dominant-acting changes, depending on the nature of the variant and the resulting effect on protein function.
No pathogenic or likely-pathogenic ClinVar variants recorded yet for this gene.
Associated conditions
Clinical presentations associated with SCAPER variants include neurodevelopmental delay, movement disorders, and structural brain abnormalities, particularly affecting the cerebellum. The cerebellum plays a central role in motor coordination, balance, and certain cognitive functions, and its abnormal development can lead to ataxia and other neurological features. Because SCAPER-related conditions are relatively recently described, the full phenotypic range and genotype-phenotype correlations remain areas of active clinical research.
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 SCAPER gene do?
SCAPER encodes a protein that appears to link cell cycle control, particularly during DNA replication in S-phase, with endoplasmic reticulum function. This coordination may be especially important during development of the brain and cerebellum.
How are SCAPER variants inherited?
Inheritance patterns can vary. Some pathogenic variants are inherited in an autosomal recessive manner, requiring two altered copies to cause disease, whilst others may act dominantly. Genetic counselling can clarify the specific inheritance relevant to a family.
Are there treatments for SCAPER-related conditions?
Management is typically supportive and tailored to the individual's neurological and developmental needs, which may include physiotherapy, occupational therapy, and educational support. There are no gene-specific therapies currently available, though research into the underlying biology continues.