8-27397661-T-C

Position:

• chr8-27397661-T-C

Variant summary

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

The NM_173176.3(PTK2B):​c.77T>C​(p.Met26Thr) 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: 34)
• Consequence: PTK2B NM_173176.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.644

Genes affected

PTK2B (HGNC:9612): (protein tyrosine kinase 2 beta) This gene encodes a cytoplasmic protein tyrosine kinase which is involved in calcium-induced regulation of ion channels and activation of the map kinase signaling pathway. The encoded protein may represent an important signaling intermediate between neuropeptide-activated receptors or neurotransmitters that increase calcium flux and the downstream signals that regulate neuronal activity. The encoded protein undergoes rapid tyrosine phosphorylation and activation in response to increases in the intracellular calcium concentration, nicotinic acetylcholine receptor activation, membrane depolarization, or protein kinase C activation. This protein has been shown to bind CRK-associated substrate, nephrocystin, GTPase regulator associated with FAK, and the SH2 domain of GRB2. The encoded protein is a member of the FAK subfamily of protein tyrosine kinases but lacks significant sequence similarity to kinases from other subfamilies. Four transcript variants encoding two different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

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=0.1709258).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PTK2B	NM_173176.3	c.77T>C	p.Met26Thr	missense_variant	2/31	ENST00000346049.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PTK2B	ENST00000346049.10	c.77T>C	p.Met26Thr	missense_variant	2/31	1	NM_173176.3	A1

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome Cov.: 64

GnomAD4 genome Cov.: 34

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

May 30, 2023

The c.77T>C (p.M26T) alteration is located in exon 7 (coding exon 1) of the PTK2B gene. This alteration results from a T to C substitution at nucleotide position 77, causing the methionine (M) at amino acid position 26 to be replaced by a threonine (T). 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	0.084
BayesDel_addAF	Benign	0.0035	T
BayesDel_noAF	Benign	-0.23
CADD	Benign	15
DANN	Uncertain	0.98
DEOGEN2	Benign	0.089	T;T;.;T;.;T;T;.
Eigen	Benign	-0.29
Eigen_PC	Benign	-0.073
FATHMM_MKL	Uncertain	0.77	D
LIST_S2	Benign	0.76	.;T;T;T;T;T;T;.
M_CAP	Benign	0.016	T
MetaRNN	Benign	0.17	T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.93	T
MutationAssessor	Benign	0.69	N;.;.;N;N;.;.;N
MutationTaster	Benign	0.84	N;N;N;N;N;N
PrimateAI	Uncertain	0.72	T
PROVEAN	Benign	0.12	N;N;N;N;N;N;N;N
REVEL	Benign	0.14
Sift	Uncertain	0.0030	D;D;D;D;D;T;T;D
Sift4G	Benign	1.0	T;T;T;T;T;T;T;T
Polyphen		0.0	B;.;.;B;B;.;.;B
Vest4		0.16
MutPred		0.22		Gain of glycosylation at M26 (P = 0.0104);Gain of glycosylation at M26 (P = 0.0104);Gain of glycosylation at M26 (P = 0.0104);Gain of glycosylation at M26 (P = 0.0104);Gain of glycosylation at M26 (P = 0.0104);Gain of glycosylation at M26 (P = 0.0104);Gain of glycosylation at M26 (P = 0.0104);Gain of glycosylation at M26 (P = 0.0104);
MVP		0.82
MPC		0.35
ClinPred		0.28	T
GERP RS		4.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.66
gMVP		0.51

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

LitVar

Other links and lift over

dbSNP: rs1808140080; hg19: chr8-27255178;