rs587777449

Positions:

• chr2-162282494-T-A
• chr2-162282494-T-C
• chr2-162282494-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP5_Moderate

The NM_022168.4(IFIH1):​c.1178A>T​(p.Asp393Val) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: IFIH1 NM_022168.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 3.60

Genes affected

IFIH1 (HGNC:18873): (interferon induced with helicase C domain 1) IFIH1 encodes MDA5 which is an intracellular sensor of viral RNA that triggers the innate immune response. Sensing RNA length and secondary structure, MDA5 binds dsRNA oligonucleotides with a modified DExD/H-box helicase core and a C-terminal domain, thus leading to a proinflammatory response that includes interferons. It has been shown that Coronaviruses (CoVs) as well as various other virus families, are capable of evading the MDA5-dependent interferon response, thus impeding the activation of the innate immune response to infection. MDA5 has also been shown to play an important role in enhancing natural killer cell function in malaria infection. In addition to its protective role in antiviral responses, MDA5 has been implicated in autoimmune and autoinflammatory diseases such as type 1 diabetes, systemic lupus erythematosus, and Aicardi-Goutieres syndrome[provided by RefSeq, Jul 2020]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 2-162282494-T-A is Pathogenic according to our data. Variant chr2-162282494-T-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 137626.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
IFIH1	NM_022168.4	c.1178A>T	p.Asp393Val	missense_variant	6/16	ENST00000649979.2	NP_071451.2
IFIH1	XM_047445407.1	c.461A>T	p.Asp154Val	missense_variant	5/15		XP_047301363.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
IFIH1	ENST00000649979.2	c.1178A>T	p.Asp393Val	missense_variant	6/16		NM_022168.4	ENSP00000497271	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Aicardi-Goutieres syndrome 7 Pathogenic:2

Likely pathogenic, criteria provided, single submitter	research	HudsonAlpha Institute for Biotechnology, HudsonAlpha Institute for Biotechnology	Dec 13, 2018	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	May 01, 2014	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.33
BayesDel_addAF	Pathogenic	0.19	D
BayesDel_noAF	Uncertain	0.030
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Benign	0.36	T;T;.
Eigen	Pathogenic	0.72
Eigen_PC	Pathogenic	0.70
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.91	.;D;D
M_CAP	Pathogenic	0.34	D
MetaRNN	Uncertain	0.74	D;D;D
MetaSVM	Benign	-1.2	T
MutationAssessor	Uncertain	2.4	M;M;.
MutationTaster	Benign	1.0	D;D
PrimateAI	Benign	0.47	T
PROVEAN	Pathogenic	-6.4	.;D;.
REVEL	Uncertain	0.33
Sift	Uncertain	0.0020	.;D;.
Sift4G	Uncertain	0.0040	.;D;.
Polyphen		1.0	D;D;.
Vest4		0.94
MutPred		0.66		Gain of MoRF binding (P = 0.0592);Gain of MoRF binding (P = 0.0592);Gain of MoRF binding (P = 0.0592);
MVP		0.71
MPC		0.22
ClinPred		0.97	D
GERP RS		5.8
Varity_R		0.79
gMVP		0.74

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: rs587777449; hg19: chr2-163139004;