12-112907118-C-A

Variant names:

• chr12-112907118-C-A
• rs117835961
• NM_016816.4:c.79C>A

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_016816.4(OAS1):​c.79C>A​(p.Arg27Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,892 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/22 in silico tools predict a benign outcome for this variant. 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. R27H) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: OAS1 NM_016816.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.0850
• Publications: 0 publications found

Genes affected

OAS1 (HGNC:8086): (2'-5'-oligoadenylate synthetase 1) This interferon-induced gene encodes a protein that synthesizes 2',5'-oligoadenylates (2-5As). This protein plays a key role in innate cellular antiviral response, and has been implicated in other cellular processes like cell growth and apoptosis. Alternative splicing results in multiple transcript variants with different enzymatic activities. Polymorphisms in this gene have been associated with susceptibility to viral infection, including SARS-CoV-2, and diabetes mellitus, type 1. This gene is located in a cluster of related genes on chromosome 12. [provided by RefSeq, May 2022]

OAS1 Gene-Disease associations (from GenCC):

• pulmonary alveolar proteinosis with hypogammaglobulinemia

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.17354038).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_016816.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	OAS1	NM_016816.4	MANE Select	c.79C>A	p.Arg27Ser	missense	Exon 1 of 6	NP_058132.2	P00973-1
	OAS1	NM_001032409.3		c.79C>A	p.Arg27Ser	missense	Exon 1 of 6	NP_001027581.1	P00973-3
	OAS1	NM_001406020.1		c.79C>A	p.Arg27Ser	missense	Exon 1 of 6	NP_001392949.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	OAS1	ENST00000202917.10	TSL:1 MANE Select	c.79C>A	p.Arg27Ser	missense	Exon 1 of 6	ENSP00000202917.5	P00973-1
	OAS1	ENST00000445409.7	TSL:1	c.79C>A	p.Arg27Ser	missense	Exon 1 of 6	ENSP00000388001.2	P00973-3
	OAS1	ENST00000540589.3	TSL:1	c.79C>A	p.Arg27Ser	missense	Exon 1 of 7	ENSP00000474083.2	S4R3A5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461892 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727246

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

American (AMR) AF: 0.00 AC: 0 AN: 44724

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

East Asian (EAS) AF: 0.0000252 AC: 1 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: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1112010

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

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.68
BayesDel_addAF	Benign	-0.17	T
BayesDel_noAF	Benign	-0.48
CADD	Benign	16
DANN	Benign	0.96
DEOGEN2	Benign	0.055	T
Eigen	Benign	-0.32
Eigen_PC	Benign	-0.45
FATHMM_MKL	Benign	0.64	D
LIST_S2	Benign	0.69	T
M_CAP	Benign	0.0053	T
MetaRNN	Benign	0.17	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.2	M
PhyloP100		0.085
PrimateAI	Benign	0.33	T
PROVEAN	Uncertain	-2.8	D
REVEL	Benign	0.16
Sift	Benign	0.15	T
Sift4G	Benign	0.18	T
Polyphen		0.80	P
Vest4		0.13
MutPred		0.47		Loss of catalytic residue at R27 (P = 0.0575)
MVP		0.38
MPC		0.12
ClinPred		0.80	D
GERP RS		3.1
PromoterAI		-0.098	Neutral
Varity_R		0.36
gMVP		0.22
Mutation Taster		=79/21	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: rs117835961; hg19: chr12-113344923;