chr12-64455949-A-G

Position:

• chr12-64455949-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The ENST00000331710.10(TBK1):​c.79A>G​(p.Arg27Gly) 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 pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: TBK1 ENST00000331710.10 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.76

Genes affected

TBK1 (HGNC:11584): (TANK binding kinase 1) The NF-kappa-B (NFKB) complex of proteins is inhibited by I-kappa-B (IKB) proteins, which inactivate NFKB by trapping it in the cytoplasm. Phosphorylation of serine residues on the IKB proteins by IKB kinases marks them for destruction via the ubiquitination pathway, thereby allowing activation and nuclear translocation of the NFKB complex. The protein encoded by this gene is similar to IKB kinases and can mediate NFKB activation in response to certain growth factors. The protein is also an important kinase for antiviral innate immunity response. [provided by RefSeq, Sep 2021]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.79

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TBK1	NM_013254.4	c.79A>G	p.Arg27Gly	missense_variant	2/21	ENST00000331710.10	NP_037386.1
TBK1	XM_005268809.2	c.79A>G	p.Arg27Gly	missense_variant	2/21		XP_005268866.1
TBK1	XM_005268810.2	c.79A>G	p.Arg27Gly	missense_variant	2/21		XP_005268867.1
TBK1	XR_007063071.1	n.178A>G		non_coding_transcript_exon_variant	2/18

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TBK1	ENST00000331710.10	c.79A>G	p.Arg27Gly	missense_variant	2/21	1	NM_013254.4	ENSP00000329967	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Frontotemporal dementia and/or amyotrophic lateral sclerosis 4 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 12, 2022

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. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt TBK1 protein function. This variant has not been reported in the literature in individuals affected with TBK1-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces arginine, which is basic and polar, with glycine, which is neutral and non-polar, at codon 27 of the TBK1 protein (p.Arg27Gly). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.23	D
BayesDel_noAF	Uncertain	0.10
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.37	T;.;T
Eigen	Uncertain	0.61
Eigen_PC	Uncertain	0.51
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Uncertain	0.92	D;D;D
M_CAP	Uncertain	0.18	D
MetaRNN	Pathogenic	0.79	D;D;D
MetaSVM	Uncertain	-0.19	T
MutationAssessor	Pathogenic	3.6	H;.;.
MutationTaster	Benign	1.0	D
PrimateAI	Pathogenic	0.83	D
PROVEAN	Uncertain	-4.2	D;D;D
REVEL	Uncertain	0.41
Sift	Benign	0.057	T;T;T
Sift4G	Benign	0.20	T;D;D
Polyphen		0.99	D;.;.
Vest4		0.93
MutPred		0.68		Loss of methylation at R27 (P = 0.0322);Loss of methylation at R27 (P = 0.0322);Loss of methylation at R27 (P = 0.0322);
MVP		0.87
MPC		1.1
ClinPred		1.0	D
GERP RS		3.8
Varity_R		0.62
gMVP		0.85

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr12-64849729;