NM_022168.4:c.1641+244A>C

Variant names:

• chr2-162279752-T-G
• rs2287292
• NM_022168.4:c.1641+244A>C

Variant summary

Our verdict is Benign. The variant received -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BA1

The NM_022168.4(IFIH1):​c.1641+244A>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.145 in 151,960 control chromosomes in the GnomAD database, including 3,775 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency: Genomes: 𝑓 0.14 (3775 hom., cov: 32)
• Consequence: IFIH1 NM_022168.4 intron
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.477
• Publications: 7 publications found

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

ACMG classification

Our verdict: Benign. The variant received -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.89).
• BP6: Variant 2-162279752-T-G is Benign according to our data. Variant chr2-162279752-T-G is described in ClinVar as Benign. ClinVar VariationId is 1228642.Status of the report is criteria_provided_single_submitter, 1 stars.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.385 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IFIH1	NM_022168.4	c.1641+244A>C		intron_variant	Intron 8 of 15	ENST00000649979.2	NP_071451.2
IFIH1	XM_047445407.1	c.924+244A>C		intron_variant	Intron 7 of 14		XP_047301363.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
IFIH1	ENST00000649979.2	c.1641+244A>C		intron_variant	Intron 8 of 15		NM_022168.4	ENSP00000497271.1

Frequencies

GnomAD3 genomes AF: 0.144 AC: 21897 AN: 151840 Hom.: 3730 Cov.: 32

Gnomad AFR AF: 0.389

Gnomad AMI AF: 0.00987

Gnomad AMR AF: 0.247

Gnomad ASJ AF: 0.00692

Gnomad EAS AF: 0.124

Gnomad SAS AF: 0.0244

Gnomad FIN AF: 0.0120

Gnomad MID AF: 0.00633

Gnomad NFE AF: 0.0131

Gnomad OTH AF: 0.124

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.145 AC: 22016 AN: 151960 Hom.: 3775 Cov.: 32 AF XY: 0.145 AC XY: 10736 AN XY: 74278

African (AFR) AF: 0.390 AC: 16157 AN: 41438

American (AMR) AF: 0.248 AC: 3784 AN: 15230

Ashkenazi Jewish (ASJ) AF: 0.00692 AC: 24 AN: 3468

East Asian (EAS) AF: 0.123 AC: 636 AN: 5162

South Asian (SAS) AF: 0.0243 AC: 117 AN: 4824

European-Finnish (FIN) AF: 0.0120 AC: 127 AN: 10608

Middle Eastern (MID) AF: 0.00680 AC: 2 AN: 294

European-Non Finnish (NFE) AF: 0.0130 AC: 886 AN: 67916

Other (OTH) AF: 0.130 AC: 274 AN: 2108

Alfa AF: 0.0919 Hom.: 283

Bravo AF: 0.179

Asia WGS AF: 0.127 AC: 441 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Benign:1

Apr 03, 2021

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.89
CADD	Benign	0.13
DANN	Benign	0.34
PhyloP100		-0.48
Mutation Taster		=100/0	polymorphism (auto)

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: rs2287292; hg19: chr2-163136262;