3-195868079-G-T

Variant names:

• chr3-195868079-G-T
• rs56260729
• NM_001382273.1:c.2219C>A

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001382273.1(TNK2):​c.2219C>A​(p.Pro740Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000687 in 1,455,450 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. 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. P740L) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: TNK2 NM_001382273.1 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.16
• Publications: 0 publications found

Genes affected

TNK2 (HGNC:19297): (tyrosine kinase non receptor 2) This gene encodes a tyrosine kinase that binds Cdc42Hs in its GTP-bound form and inhibits both the intrinsic and GTPase-activating protein (GAP)-stimulated GTPase activity of Cdc42Hs. This binding is mediated by a unique sequence of 47 amino acids C-terminal to an SH3 domain. The protein may be involved in a regulatory mechanism that sustains the GTP-bound active form of Cdc42Hs and which is directly linked to a tyrosine phosphorylation signal transduction pathway. Several alternatively spliced transcript variants have been identified from this gene, but the full-length nature of only two transcript variants has been determined. [provided by RefSeq, Jul 2008]

TNK2 Gene-Disease associations (from GenCC):

• infantile-onset mesial temporal lobe epilepsy with severe cognitive regression

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.06478751).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TNK2	NM_001382273.1	c.2219C>A	p.Pro740Gln	missense_variant	Exon 13 of 16	ENST00000672887.2	NP_001369202.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TNK2	ENST00000672887.2	c.2219C>A	p.Pro740Gln	missense_variant	Exon 13 of 16		NM_001382273.1	ENSP00000499899.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.87e-7 AC: 1 AN: 1455450 Hom.: 0 Cov.: 64 AF XY: 0.00000138 AC XY: 1 AN XY: 723842

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33418

American (AMR) AF: 0.00 AC: 0 AN: 44164

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26004

East Asian (EAS) AF: 0.00 AC: 0 AN: 39548

South Asian (SAS) AF: 0.00 AC: 0 AN: 85824

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50384

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5754

European-Non Finnish (NFE) AF: 9.01e-7 AC: 1 AN: 1110226

Other (OTH) AF: 0.00 AC: 0 AN: 60128

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.068
BayesDel_addAF	Benign	-0.28	T
BayesDel_noAF	Benign	-0.64
CADD	Benign	0.26
DANN	Benign	0.60
DEOGEN2	Benign	0.0083	T;.;T;T
Eigen	Benign	-1.2
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.25	N
LIST_S2	Benign	0.59	.;T;T;T
M_CAP	Benign	0.023	T
MetaRNN	Benign	0.065	T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	-0.34	.;.;N;.
PhyloP100		1.2
PrimateAI	Uncertain	0.49	T
PROVEAN	Benign	-0.35	N;N;N;N
REVEL	Benign	0.023
Sift	Benign	0.29	T;T;T;T
Sift4G	Uncertain	0.051	T;T;T;T
Polyphen		0.25, 0.17, 0.16	.;B;B;B
Vest4		0.20, 0.19, 0.22
MutPred		0.17		.;.;.;Loss of glycosylation at P757 (P = 0.0188);
MVP		0.60
MPC		0.0091
ClinPred		0.13	T
GERP RS		1.4
Varity_R		0.018
gMVP		0.18
Mutation Taster		=98/2	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: rs56260729; hg19: chr3-195594950;