19-4816411-G-C

Variant names:

• chr19-4816411-G-C
• rs762670581
• NM_182919.4:c.1967C>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_182919.4(TICAM1):​c.1967C>G​(p.Pro656Arg) 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. 14/21 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: TICAM1 NM_182919.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.220
• Publications: 0 publications found

Genes affected

TICAM1 (HGNC:18348): (TIR domain containing adaptor molecule 1) This gene encodes an adaptor protein containing a Toll/interleukin-1 receptor (TIR) homology domain, which is an intracellular signaling domain that mediates protein-protein interactions between the Toll-like receptors (TLRs) and signal-transduction components. This protein is involved in native immunity against invading pathogens. It specifically interacts with toll-like receptor 3, but not with other TLRs, and this association mediates dsRNA induction of interferon-beta through activation of nuclear factor kappa-B, during an antiviral immune response. Mutations in this gene are associated with encephalopathy, acute, infection-induced. [provided by RefSeq, Jul 2020]

TICAM1 Gene-Disease associations (from GenCC):

• herpes simplex encephalitis, susceptibility to, 4

  Inheritance: AR, SD, AD Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.07166496).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TICAM1	NM_182919.4	c.1967C>G	p.Pro656Arg	missense_variant	Exon 2 of 2	ENST00000248244.6	NP_891549.1
TICAM1	NM_001385678.1	c.1925C>G	p.Pro642Arg	missense_variant	Exon 3 of 3		NP_001372607.1
TICAM1	NM_001385679.1	c.1832C>G	p.Pro611Arg	missense_variant	Exon 2 of 2		NP_001372608.1
TICAM1	NM_001385680.1	c.1325C>G	p.Pro442Arg	missense_variant	Exon 3 of 3		NP_001372609.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TICAM1	ENST00000248244.6	c.1967C>G	p.Pro656Arg	missense_variant	Exon 2 of 2	1	NM_182919.4	ENSP00000248244.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000482 AC: 1 AN: 207454 AF XY: 0.00000903

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000580

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome Cov.: 37

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000826 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Herpes simplex encephalitis, susceptibility to, 4 Uncertain:1

Aug 30, 2020

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces proline with arginine at codon 656 of the TICAM1 protein (p.Pro656Arg). The proline residue is weakly conserved and there is a moderate physicochemical difference between proline and arginine. This variant is present in population databases (rs762670581, ExAC 0.01%). 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. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with TICAM1-related conditions. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.40	T
BayesDel_noAF	Benign	-0.64
CADD	Benign	6.1
DANN	Uncertain	0.98
DEOGEN2	Benign	0.16	T
Eigen	Benign	-0.99
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.10	N
LIST_S2	Benign	0.34	T
M_CAP	Benign	0.0015	T
MetaRNN	Benign	0.072	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.0	N
PhyloP100		-0.22
PrimateAI	Uncertain	0.55	T
PROVEAN	Benign	-1.6	N
REVEL	Benign	0.0090
Sift	Uncertain	0.010	D
Sift4G	Uncertain	0.0070	D
Polyphen		0.32	B
Vest4		0.13
MutPred		0.24		Gain of solvent accessibility (P = 0.0411);
MVP		0.093
MPC		0.26
ClinPred		0.067	T
GERP RS		-0.52
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.067
Mutation Taster		=99/1	polymorphism

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: rs762670581; hg19: chr19-4816423;