chr3-195866930-G-T

Variant names:

• chr3-195866930-G-T
• rs778680851
• NM_001382273.1:c.3120C>A

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_001382273.1(TNK2):​c.3120C>A​(p.Ala1040Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,142 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. A1040A) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: TNK2 NM_001382273.1 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.0960
• 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
• genetic generalized epilepsy

  Inheritance: AR Classification: LIMITED Submitted by: PanelApp Australia

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.64).
• BP7: Synonymous conserved (PhyloP=-0.096 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001382273.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TNK2	NM_001382273.1	MANE Select	c.3120C>A	p.Ala1040Ala	synonymous	Exon 15 of 16	NP_001369202.1	A0A5F9ZGX5
	TNK2	NM_001387707.1		c.3216C>A	p.Ala1072Ala	synonymous	Exon 15 of 16	NP_001374636.1
	TNK2	NM_001382272.1		c.3192C>A	p.Ala1064Ala	synonymous	Exon 15 of 16	NP_001369201.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TNK2	ENST00000672887.2	MANE Select	c.3120C>A	p.Ala1040Ala	synonymous	Exon 15 of 16	ENSP00000499899.1	A0A5F9ZGX5
	TNK2	ENST00000428187.7	TSL:1	c.3075C>A	p.Ala1025Ala	synonymous	Exon 13 of 14	ENSP00000392546.1	C9J1X3
	TNK2	ENST00000333602.14	TSL:1	c.3069C>A	p.Ala1023Ala	synonymous	Exon 14 of 15	ENSP00000329425.6	Q07912-1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000406 AC: 1 AN: 246608 AF XY: 0.00000746

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000291

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460142 Hom.: 0 Cov.: 34 AF XY: 0.00000138 AC XY: 1 AN XY: 726414

⚠️ 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: 33466

American (AMR) AF: 0.0000224 AC: 1 AN: 44624

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26100

East Asian (EAS) AF: 0.00 AC: 0 AN: 39666

South Asian (SAS) AF: 0.00 AC: 0 AN: 86154

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52448

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5760

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111630

Other (OTH) AF: 0.00 AC: 0 AN: 60294

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.64
CADD	Benign	0.15
DANN	Benign	0.80
PhyloP100		-0.096

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		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: rs778680851; hg19: chr3-195593801;