chr20-3864379-C-T

Position:

• chr20-3864379-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_020746.5(MAVS):​c.749C>T​(p.Thr250Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: MAVS NM_020746.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.515

Genes affected

MAVS (HGNC:29233): (mitochondrial antiviral signaling protein) This gene encodes an intermediary protein necessary in the virus-triggered beta interferon signaling pathways. It is required for activation of transcription factors which regulate expression of beta interferon and contributes to antiviral innate immunity. [provided by RefSeq, Jul 2020]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.070023894).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MAVS	NM_020746.5	c.749C>T	p.Thr250Ile	missense_variant	6/7	ENST00000428216.4
MAVS	NM_001206491.2	c.326C>T	p.Thr109Ile	missense_variant	5/6
MAVS	NM_001385663.1	c.326C>T	p.Thr109Ile	missense_variant	7/8
MAVS	NR_037921.2	n.713C>T		non_coding_transcript_exon_variant	5/6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MAVS	ENST00000428216.4	c.749C>T	p.Thr250Ile	missense_variant	6/7	1	NM_020746.5	P1
MAVS	ENST00000416600.6	c.326C>T	p.Thr109Ile	missense_variant	5/6	1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000370 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 24, 2023

The c.749C>T (p.T250I) alteration is located in exon 6 (coding exon 5) of the MAVS gene. This alteration results from a C to T substitution at nucleotide position 749, causing the threonine (T) at amino acid position 250 to be replaced by an isoleucine (I). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.16
BayesDel_addAF	Benign	-0.26	T
BayesDel_noAF	Benign	-0.62
CADD	Benign	11
DANN	Benign	0.48
DEOGEN2	Benign	0.15	.;T
Eigen	Benign	-0.86
Eigen_PC	Benign	-0.90
FATHMM_MKL	Benign	0.034	N
LIST_S2	Benign	0.35	T;T
M_CAP	Benign	0.0071	T
MetaRNN	Benign	0.070	T;T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	1.6	.;L
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Benign	0.40	T
PROVEAN	Benign	-2.3	N;N
REVEL	Benign	0.030
Sift	Benign	0.44	T;T
Sift4G	Benign	0.082	T;T
Polyphen		0.078	.;B
Vest4		0.14
MVP		0.44
MPC		0.17
ClinPred		0.21	T
GERP RS		1.1
Varity_R		0.040
gMVP		0.095

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs2089889075; hg19: chr20-3845026;