VCV002597050.5 - ClinVar

NM_004153.4(ORC1):c.521C>T (p.Ala174Val)

Germline

Classification

criteria provided, multiple submitters, no conflicts. Learn more about how ClinVar calculates review status.

Uncertain significance
Uncertain significance (3)

3 out of 3 submissions contributed to this classification

The aggregate germline classification for this variant, typically for a monogenic or Mendelian disorder as in the ACMG/AMP guidelines, or for response to a drug. This value is calculated by NCBI based on data from submitters. Read our rules for calculating the aggregate classification.

Somatic

No data submitted for somatic clinical impact

Somatic

No data submitted for oncogenicity

Variant Details

Identifiers

NM_004153.4(ORC1):c.521C>T (p.Ala174Val)

Variation ID: 2597050 Accession: VCV002597050.5

Type and length

single nucleotide variant, 1 bp

Location

Cytogenetic: 1p32.3 1: 52396246 (GRCh38) [ NCBI UCSC ] 1: 52861918 (GRCh37) [ NCBI UCSC ]

Timeline in ClinVar

	First in ClinVar Help The date this variant first appeared in ClinVar with each type of classification.	Last submission Help The date of the most recent submission for each type of classification for this variant.	Last evaluated Help The most recent date that a submitter evaluated this variant for each type of classification.
Germline	Oct 28, 2023	Feb 23, 2026	May 23, 2024

HGVS

Nucleotide	Protein	Molecular consequence
NM_004153.4:c.521C>T MANE Select Help Transcripts from the Matched Annotation from the NCBI and EMBL-EBI (MANE) collaboration.	NP_004144.2:p.Ala174Val	missense
NM_001190818.2:c.521C>T	NP_001177747.1:p.Ala174Val	missense
NM_001190819.2:c.521C>T	NP_001177748.1:p.Ala174Val	missense
NC_000001.11:g.52396246G>A
NC_000001.10:g.52861918G>A
NG_028251.1:g.13226C>T
NG_028251.2:g.18257C>T

... more HGVS ... less HGVS

Protein change

A174V

Other names

Canonical SPDI

NC_000001.11:52396245:G:A

Global minor allele frequency (GMAF) Help The global minor allele frequency calculated by the 1000 Genomes Project. The minor allele at this location is indicated in parentheses and may be different from the allele represented by this VCV record.

Allele frequency Help The frequency of the allele represented by this VCV record.

Trans-Omics for Precision Medicine (TOPMed) 0.00002

Links

ClinGen: CA853572 dbSNP: rs764553903 VarSome

Genes

Gene	OMIM	ClinGen Gene Dosage Sensitivity Curation		Variation Viewer Help Links to Variation Viewer, a genome browser to view variation data from NCBI databases.	Related variants
Gene	OMIM	HI score Help The haploinsufficiency score for the gene, curated by ClinGen’s Dosage Sensitivity Curation task team.	TS score Help The triplosensitivity score for the gene, curated by ClinGen’s Dosage Sensitivity Curation task team.		Within gene Help The number of variants in ClinVar that are contained within this gene, with a link to view the list of variants.	All Help The number of variants in ClinVar for this gene, including smaller variants within the gene and larger CNVs that overlap or fully contain the gene.
ORC1		-	-	GRCh38 GRCh37	435	457

Conditions - Germline

Condition Help The condition for this variant-condition (RCV) record in ClinVar.	Classification Help The aggregate germline classification for this variant-condition (RCV) record in ClinVar. The number of submissions that contribute to this aggregate classification is shown in parentheses. (# of submissions)	Review status Help The aggregate review status for this variant-condition (RCV) record in ClinVar. This value is calculated by NCBI based on data from submitters. Read our rules for calculating the review status.	Last evaluated Help The most recent date that a submitter evaluated this variant for the condition.	Variation/condition record Help The RCV accession number, with most recent version number, for the variant-condition record, with a link to the RCV web page.
Inborn genetic diseases	Uncertain significance (1)	criteria provided, single submitter	Jul 14, 2023	RCV003349944.2
Meier-Gorlin syndrome 1	Uncertain significance (1)	criteria provided, single submitter	Sep 13, 2023	RCV003636012.1
not provided	Uncertain significance (1)	criteria provided, single submitter	May 23, 2024	RCV005104089.2

Submissions - Germline

Classification Help The submitted germline classification for each SCV record. (Last evaluated)	Review status Help Stars represent the review status, or the level of review supporting the submitted (SCV) record. This value is calculated by NCBI based on data from the submitter. Read our rules for calculating the review status. This column also includes a link to the submitter’s assertion criteria if provided, and the collection method. (Assertion criteria)	Condition Help The condition for the classification, provided by the submitter for this submitted (SCV) record. This column also includes the affected status and allele origin of individuals observed with this variant.	Submitter Help The submitting organization for this submitted (SCV) record. This column also includes the SCV accession and version number, the date this SCV first appeared in ClinVar, and the date that this SCV was last updated in ClinVar.	Expand all rows Collapse all rows Help This column includes more information supporting the classification, including citations, the comment on classification, and detailed evidence provided as observations of the variant by the submitter.
Uncertain significance (Sep 13, 2023) C Contributing to aggregate classification	criteria provided, single submitter (ARUP Molecular Germline Variant Investigation Process 2024)	Meier-Gorlin syndrome 1	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories Accession: SCV004562595.1 First in ClinVar: Feb 20, 2024 Last updated: Feb 20, 2024	Observation: 1 Collection method: clinical testing Allele origin: germline Affected status: unknown Observation 1 Collection method: clinical testing Allele origin: germline Affected status: unknown

Uncertain significance (Jul 14, 2023) C Contributing to aggregate classification	criteria provided, single submitter (Ambry Variant Classification Scheme 2023)	Inborn genetic diseases	Ambry Genetics Accession: SCV004061321.2 First in ClinVar: Oct 28, 2023 Last updated: May 01, 2024	Comment: show The c.521C>T (p.A174V) alteration is located in exon 5 (coding exon 4) of the ORC1 gene. This alteration results from a C to T substitution at nucleotide position 521, causing the alanine (A) at amino acid position 174 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. (less) Observation: 1 Collection method: clinical testing Allele origin: germline Affected status: unknown Observation 1 Collection method: clinical testing Allele origin: germline Affected status: unknown

Uncertain significance (May 23, 2024) C Contributing to aggregate classification	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	not provided	Labcorp Genetics (formerly Invitae), Labcorp Accession: SCV005820761.2 First in ClinVar: Feb 25, 2025 Last updated: Feb 23, 2026	Comment: show This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 174 of the ORC1 protein (p.Ala174Val). This variant is present in population databases (rs764553903, gnomAD 0.006%). This variant has not been reported in the literature in individuals affected with ORC1-related conditions. ClinVar contains an entry for this variant (Variation ID: 2597050). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on ORC1 protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. (less) Observation: 1 Collection method: clinical testing Allele origin: germline Affected status: unknown Observation 1 Collection method: clinical testing Allele origin: germline Affected status: unknown

Comment:

The c.521C>T (p.A174V) alteration is located in exon 5 (coding exon 4) of the ORC1 gene. This alteration results from a C to T substitution at nucleotide position 521, causing the alanine (A) at amino acid position 174 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear.

Comment:

This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 174 of the ORC1 protein (p.Ala174Val). This variant is present in population databases (rs764553903, gnomAD 0.006%). This variant has not been reported in the literature in individuals affected with ORC1-related conditions. ClinVar contains an entry for this variant (Variation ID: 2597050). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on ORC1 protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance.

Citations for germline classification of this variant

There are no citations for germline classification of this variant in ClinVar. If you know of citations for this variation, please consider submitting that information to ClinVar.

Text-mined citations for rs764553903 ...

These citations are identified by LitVar using the rs number, so they may include citations for more than one variant at this location. Please review the LitVar results carefully for your variant of interest.

Record last updated Apr 13, 2026