1-52373087-G-A

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4_Strong BS1_Supporting

The NM_004153.4(ORC1):c.*94C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00127 in 1,273,322 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.0014 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0013 (3 hom.)
• Consequence: ORC1 NM_004153.4 3_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.0800

Genes affected

ORC1 (HGNC:8487): (origin recognition complex subunit 1) The origin recognition complex (ORC) is a highly conserved six subunits protein complex essential for the initiation of the DNA replication in eukaryotic cells. Studies in yeast demonstrated that ORC binds specifically to origins of replication and serves as a platform for the assembly of additional initiation factors such as Cdc6 and Mcm proteins. The protein encoded by this gene is the largest subunit of the ORC complex. While other ORC subunits are stable throughout the cell cycle, the levels of this protein vary during the cell cycle, which has been shown to be controlled by ubiquitin-mediated proteolysis after initiation of DNA replication. This protein is found to be selectively phosphorylated during mitosis. It is also reported to interact with MYST histone acetyltransferase 2 (MyST2/HBO1), a protein involved in control of transcription silencing. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jun 2010]

ACMG classification

Verdict is Likely_benign. Variant got -5 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.92).
• BS1: Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.00138 (210/152300) while in subpopulation AMR AF= 0.00562 (86/15298). AF 95% confidence interval is 0.00466. There are 0 homozygotes in gnomad4. There are 109 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ORC1	NM_004153.4	c.*94C>T		3_prime_UTR_variant	17/17	ENST00000371568.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ORC1	ENST00000371568.8	c.*94C>T		3_prime_UTR_variant	17/17	1	NM_004153.4	P1
ORC1	ENST00000371566.1	c.*94C>T		3_prime_UTR_variant	17/17	1		P1

Frequencies

GnomAD3 genomes AF: 0.00138 AC: 210 AN: 152182 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000965

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00563

Gnomad ASJ AF: 0.00518

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.000377

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00131

Gnomad OTH AF: 0.00430

GnomAD4 exome AF: 0.00125 AC: 1405 AN: 1121022 Hom.: 3 Cov.: 15 AF XY: 0.00122 AC XY: 700 AN XY: 573372

Gnomad4 AFR exome AF: 0.000186

Gnomad4 AMR exome AF: 0.00238

Gnomad4 ASJ exome AF: 0.00549

Gnomad4 EAS exome AF: 0.000106

Gnomad4 SAS exome AF: 0.000127

Gnomad4 FIN exome AF: 0.000135

Gnomad4 NFE exome AF: 0.00133

Gnomad4 OTH exome AF: 0.00149

GnomAD4 genome AF: 0.00138 AC: 210 AN: 152300 Hom.: 0 Cov.: 32 AF XY: 0.00146 AC XY: 109 AN XY: 74468

Gnomad4 AFR AF: 0.0000963

Gnomad4 AMR AF: 0.00562

Gnomad4 ASJ AF: 0.00518

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.000377

Gnomad4 NFE AF: 0.00131

Gnomad4 OTH AF: 0.00425

Alfa AF: 0.00111 Hom.: 0

Bravo AF: 0.00135

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Meier-Gorlin syndrome 1 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.92
Cadd	Benign	3.5
Dann	Benign	0.39
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs574908976; hg19: chr1-52838759; COSMIC: COSV65364674; COSMIC: COSV65364674;