rs398122892

Positions:

• chr1-154589456-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP2 PP3_Moderate

The NM_001111.5(ADAR):​c.2675G>A​(p.Arg892His) variant causes a missense change. The variant allele was found at a frequency of 0.00000274 in 1,459,864 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. R892R) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: ADAR NM_001111.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter P:2 U:1
• Conservation: PhyloP100: 5.48

Genes affected

ADAR (HGNC:225): (adenosine deaminase RNA specific) This gene encodes the enzyme responsible for RNA editing by site-specific deamination of adenosines. This enzyme destabilizes double-stranded RNA through conversion of adenosine to inosine. Mutations in this gene have been associated with dyschromatosis symmetrica hereditaria. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2010]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), ADAR. . Gene score misZ 2.2714 (greater than the threshold 3.09). Trascript score misZ 3.4067 (greater than threshold 3.09). GenCC has associacion of gene with dyschromatosis symmetrica hereditaria, Aicardi-Goutieres syndrome, Aicardi-Goutieres syndrome 6, Leigh syndrome, familial infantile bilateral striatal necrosis.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.938

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ADAR	NM_001111.5	c.2675G>A	p.Arg892His	missense_variant	9/15	ENST00000368474.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ADAR	ENST00000368474.9	c.2675G>A	p.Arg892His	missense_variant	9/15	1	NM_001111.5	P3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1459864 Hom.: 0 Cov.: 31 AF XY: 0.00000551 AC XY: 4 AN XY: 726418

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:2 Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Aicardi-Goutieres syndrome 6 Pathogenic:2

Likely pathogenic, no assertion criteria provided	literature only	ClinVar Staff, National Center for Biotechnology Information (NCBI)	Jun 27, 2013	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	Nov 01, 2012	- -

Symmetrical dyschromatosis of extremities;C3539013:Aicardi-Goutieres syndrome 6 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Oct 10, 2023

This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 892 of the ADAR protein (p.Arg892His). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with clinical features of Aicardi Goutieres syndrome (PMID: 23001123). ClinVar contains an entry for this variant (Variation ID: 39455). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt ADAR protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.49	D
BayesDel_noAF	Pathogenic	0.47
CADD	Pathogenic	32
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.93	D;.;D;.;.;.;.;.;.;.
Eigen	Pathogenic	0.81
Eigen_PC	Pathogenic	0.78
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Pathogenic	0.97	.;.;D;.;.;.;.;.;D;D
M_CAP	Pathogenic	0.41	D
MetaRNN	Pathogenic	0.94	D;D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	0.95	D
MutationAssessor	Pathogenic	2.9	M;.;M;.;.;.;.;.;.;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.77	T
PROVEAN	Uncertain	-3.9	D;.;.;.;D;.;.;.;.;.
REVEL	Pathogenic	0.90
Sift	Uncertain	0.0020	D;.;.;.;D;.;.;.;.;.
Sift4G	Uncertain	0.0030	D;.;.;.;D;.;.;.;.;.
Polyphen		1.0	D;.;D;.;.;.;.;.;.;D
Vest4		0.87
MutPred		0.80		Loss of sheet (P = 0.0315);.;Loss of sheet (P = 0.0315);.;.;.;.;.;.;.;
MVP		0.98
MPC		2.2
ClinPred		1.0	D
GERP RS		5.4
RBP_binding_hub_radar		1.1
RBP_regulation_power_radar		2.8
Varity_R		0.85
gMVP		0.82

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: rs398122892; hg19: chr1-154561932; COSMIC: COSV52716474; COSMIC: COSV52716474;