chr1-52374854-C-A

Position:

• chr1-52374854-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The ENST00000371568.8(ORC1):​c.2347G>T​(p.Ala783Ser) variant causes a missense change. The variant allele was found at a frequency of 0.00000411 in 1,461,586 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A783T) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: ORC1 ENST00000371568.8 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.71

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 Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ORC1	NM_004153.4	c.2347G>T	p.Ala783Ser	missense_variant	16/17	ENST00000371568.8	NP_004144.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ORC1	ENST00000371568.8	c.2347G>T	p.Ala783Ser	missense_variant	16/17	1	NM_004153.4	ENSP00000360623	P1
ORC1	ENST00000371566.1	c.2347G>T	p.Ala783Ser	missense_variant	16/17	1		ENSP00000360621	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000411 AC: 6 AN: 1461586 Hom.: 0 Cov.: 30 AF XY: 0.00000413 AC XY: 3 AN XY: 727138

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000540

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Uncertain	0.050	T
BayesDel_noAF	Benign	-0.17
CADD	Uncertain	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.017	T;T
Eigen	Uncertain	0.40
Eigen_PC	Uncertain	0.50
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.91	.;D
M_CAP	Benign	0.019	T
MetaRNN	Uncertain	0.51	D;D
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.3	L;L
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.50	T
PROVEAN	Benign	-1.8	N;N
REVEL	Benign	0.14
Sift	Benign	0.083	T;T
Sift4G	Benign	0.13	T;T
Polyphen		0.71	P;P
Vest4		0.53
MutPred		0.49		Gain of disorder (P = 0.0509);Gain of disorder (P = 0.0509);
MVP		0.64
MPC		0.48
ClinPred		0.72	D
GERP RS		6.0
Varity_R		0.45
gMVP		0.37

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: rs779410890; hg19: chr1-52840526;