1-52396142-C-T

Variant names:

• chr1-52396142-C-T
• rs1553148123
• NM_004153.4:c.625G>A

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4_Strong BS1_Supporting

The NM_004153.4(ORC1):​c.625G>A​(p.Ala209Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000479 in 1,461,888 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000048 (0 hom.)
• Consequence: ORC1 NM_004153.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.00
• Publications: 0 publications found

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]

ORC1 Gene-Disease associations (from GenCC):

• Meier-Gorlin syndrome 1

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
• Meier-Gorlin syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -5 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.066642374).
• BS1: Variant frequency is greater than expected in population mid. GnomAdExome4 allele frequency = 0.00000479 (7/1461888) while in subpopulation MID AF = 0.00121 (7/5768). AF 95% confidence interval is 0.000569. There are 0 homozygotes in GnomAdExome4. There are 2 alleles in the male GnomAdExome4 subpopulation. Median coverage is 32. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ORC1	NM_004153.4	c.625G>A	p.Ala209Thr	missense_variant	Exon 5 of 17	ENST00000371568.8	NP_004144.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ORC1	ENST00000371568.8	c.625G>A	p.Ala209Thr	missense_variant	Exon 5 of 17	1	NM_004153.4	ENSP00000360623.3
ORC1	ENST00000371566.1	c.625G>A	p.Ala209Thr	missense_variant	Exon 5 of 17	1		ENSP00000360621.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000479 AC: 7 AN: 1461888 Hom.: 0 Cov.: 32 AF XY: 0.00000275 AC XY: 2 AN XY: 727244

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.00121 AC: 7 AN: 5768

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1112008

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

May 05, 2016

Genetic Services Laboratory, University of Chicago

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.074
BayesDel_addAF	Benign	-0.30	T
BayesDel_noAF	Benign	-0.67
CADD	Benign	12
DANN	Benign	0.23
DEOGEN2	Benign	0.0074	T;T
Eigen	Benign	-0.79
Eigen_PC	Benign	-0.80
FATHMM_MKL	Benign	0.12	N
LIST_S2	Benign	0.73	.;T
M_CAP	Benign	0.021	T
MetaRNN	Benign	0.067	T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.2	L;L
PhyloP100		1.0
PrimateAI	Benign	0.24	T
PROVEAN	Benign	-0.080	N;N
REVEL	Benign	0.047
Sift	Benign	0.61	T;T
Sift4G	Benign	0.62	T;T
Polyphen		0.34	B;B
Vest4		0.044
MutPred		0.13		Gain of phosphorylation at A209 (P = 0.0406);Gain of phosphorylation at A209 (P = 0.0406);
MVP		0.41
MPC		0.16
ClinPred		0.062	T
GERP RS		2.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.018
gMVP		0.23
Mutation Taster		=97/3	polymorphism

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

Other links and lift over

dbSNP: rs1553148123; hg19: chr1-52861814;