dbSNP rs200945986: IFIH1:p.Arg598Leu (chr2-162277666-C-A) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_022168.4(IFIH1):c.1793G>T(p.Arg598Leu) variant causes a missense change. The variant allele was found at a frequency of 0.000000688 in 1,452,478 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. R598H) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

IFIH1
NM_022168.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 4.86

Publications

0 publications found

Variant links:

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]

IFIH1 Gene-Disease associations (from GenCC):

Aicardi-Goutieres syndrome 7
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: PanelApp Australia, Illumina, Labcorp Genetics (formerly Invitae), G2P
Singleton-Merten syndrome 1
Inheritance: AD Classification: STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
Aicardi-Goutieres syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Singleton-Merten dysplasia
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
immunodeficiency 95
Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics

IFIH1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IFIH1	NM_022168.4 link	c.1793G>T	p.Arg598Leu	missense_variant	Exon 10 of 16	ENST00000649979.2	NP_071451.2	Q9BYX4-1
IFIH1	XM_047445407.1 link	c.1076G>T	p.Arg359Leu	missense_variant	Exon 9 of 15		XP_047301363.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
IFIH1	ENST00000649979.2 link	c.1793G>T	p.Arg598Leu	missense_variant	Exon 10 of 16		NM_022168.4	ENSP00000497271.1		Q9BYX4-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.88e-7

AC:

AN:

1452478

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

722058

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

32972

American (AMR)

AF:

0.00

AC:

AN:

43118

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25822

East Asian (EAS)

AF:

0.00

AC:

AN:

39596

South Asian (SAS)

AF:

0.00

AC:

AN:

84308

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53268

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5718

European-Non Finnish (NFE)

AF:

9.03e-7

AC:

AN:

1107726

Other (OTH)

AF:

0.00

AC:

AN:

59950

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.47

BayesDel_addAF

Uncertain

0.10

BayesDel_noAF

Benign

-0.090

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.40

T;T;.

Eigen

Pathogenic

0.79

Eigen_PC

Pathogenic

0.76

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Uncertain

0.95

.;D;D

M_CAP

Uncertain

0.098

MetaRNN

Uncertain

0.70

D;D;D

MetaSVM

Benign

-1.2

MutationAssessor

Pathogenic

3.5

H;H;.

PhyloP100

4.9

PrimateAI

Uncertain

0.49

PROVEAN

Pathogenic

-5.2

.;D;.

REVEL

Benign

0.23

Sift

Uncertain

0.0040

.;D;.

Sift4G

Uncertain

0.0080

.;D;.

Polyphen

0.99

D;D;.

Vest4

0.82

MutPred

0.56

Loss of MoRF binding (P = 0.001);Loss of MoRF binding (P = 0.001);.;

MVP

0.66

MPC

0.21

ClinPred

0.99

GERP RS

5.7

Varity_R

0.84

gMVP

0.58

Mutation Taster

=65/35

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over