12-112997701-A-T

Position:

• chr12-112997701-A-T

Variant summary

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

The ENST00000392583.7(OAS2):​c.809A>T​(p.Asn270Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,460,662 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: OAS2 ENST00000392583.7 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.336

Genes affected

OAS2 (HGNC:8087): (2'-5'-oligoadenylate synthetase 2) This gene encodes a member of the 2-5A synthetase family, essential proteins involved in the innate immune response to viral infection. The encoded protein is induced by interferons and uses adenosine triphosphate in 2'-specific nucleotidyl transfer reactions to synthesize 2',5'-oligoadenylates (2-5As). These molecules activate latent RNase L, which results in viral RNA degradation and the inhibition of viral replication. The three known members of this gene family are located in a cluster on chromosome 12. Alternatively spliced transcript variants encoding different isoforms have been described. [provided by RefSeq, Jul 2008]

(HGNC:):

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
OAS2	NM_002535.3	c.809A>T	p.Asn270Ile	missense_variant	4/10	ENST00000392583.7	NP_002526.2
OAS2	NM_016817.3	c.809A>T	p.Asn270Ile	missense_variant	4/11		NP_058197.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
OAS2	ENST00000392583.7	c.809A>T	p.Asn270Ile	missense_variant	4/10	1	NM_002535.3	ENSP00000376362	P2
	ENST00000552784.1	n.353+19698T>A		intron_variant, non_coding_transcript_variant		4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1460662 Hom.: 0 Cov.: 33 AF XY: 0.00000275 AC XY: 2 AN XY: 726490

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: 0.00000360

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 26, 2023

The c.809A>T (p.N270I) alteration is located in exon 4 (coding exon 4) of the OAS2 gene. This alteration results from a A to T substitution at nucleotide position 809, causing the asparagine (N) at amino acid position 270 to be replaced by an isoleucine (I). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.26
BayesDel_addAF	Benign	-0.032	T
BayesDel_noAF	Benign	-0.28
CADD	Benign	16
DANN	Uncertain	0.99
DEOGEN2	Benign	0.29	T;.;.;T
Eigen	Uncertain	0.27
Eigen_PC	Benign	0.11
FATHMM_MKL	Benign	0.72	D
LIST_S2	Benign	0.81	T;T;D;T
M_CAP	Benign	0.044	D
MetaRNN	Uncertain	0.52	D;D;D;D
MetaSVM	Benign	-0.46	T
MutationAssessor	Uncertain	2.8	M;M;.;.
MutationTaster	Benign	0.87	D;D
PrimateAI	Benign	0.39	T
PROVEAN	Uncertain	-3.5	D;D;D;.
REVEL	Benign	0.25
Sift	Pathogenic	0.0	D;D;D;.
Sift4G	Pathogenic	0.0010	D;D;D;D
Polyphen		1.0	D;D;.;.
Vest4		0.59
MutPred		0.57		Gain of catalytic residue at V267 (P = 0.0157);Gain of catalytic residue at V267 (P = 0.0157);.;Gain of catalytic residue at V267 (P = 0.0157);
MVP		0.73
MPC		0.71
ClinPred		0.99	D
GERP RS		4.1
Varity_R		0.53
gMVP		0.35

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr12-113435506;