17-54999838-G-T

Position:

• chr17-54999838-G-T

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 2P and 6B. PM2 BP4_Strong BP6_Moderate

The NM_178509.6(STXBP4):​c.494G>T​(p.Cys165Phe) 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. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: STXBP4 NM_178509.6 missense
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.825

Genes affected

STXBP4 (HGNC:19694): (syntaxin binding protein 4) Enables syntaxin binding activity. Involved in several processes, including positive regulation of cell cycle G1/S phase transition; positive regulation of keratinocyte proliferation; and protein stabilization. Located in extracellular exosome. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Likely_benign. Variant got -4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.023355573).
• BP6: Variant 17-54999838-G-T is Benign according to our data. Variant chr17-54999838-G-T is described in ClinVar as [Likely_benign]. Clinvar id is 3171805.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
STXBP4	NM_178509.6	c.494G>T	p.Cys165Phe	missense_variant	6/18	ENST00000376352.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
STXBP4	ENST00000376352.6	c.494G>T	p.Cys165Phe	missense_variant	6/18	2	NM_178509.6	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000329 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 30, 2023

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.065
BayesDel_addAF	Benign	-0.36	T
BayesDel_noAF	Benign	-0.75
CADD	Benign	6.1
DANN	Benign	0.37
DEOGEN2	Benign	0.018	T;T;T;.;.
Eigen	Benign	-1.5
Eigen_PC	Benign	-1.4
FATHMM_MKL	Benign	0.0016	N
LIST_S2	Benign	0.51	T;T;T;T;T
M_CAP	Benign	0.0037	T
MetaRNN	Benign	0.023	T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	-0.57	N;.;.;.;.
MutationTaster	Benign	1.0	N;N;N;N;N
PrimateAI	Benign	0.25	T
PROVEAN	Benign	-1.3	N;N;N;N;.
REVEL	Benign	0.021
Sift	Benign	0.81	T;T;T;T;.
Sift4G	Benign	0.77	T;T;T;T;D
Polyphen		0.0	B;.;B;B;.
Vest4		0.12
MutPred		0.23		Loss of methylation at K168 (P = 0.1058);Loss of methylation at K168 (P = 0.1058);Loss of methylation at K168 (P = 0.1058);.;.;
MVP		0.19
MPC		0.23
ClinPred		0.019	T
GERP RS		-1.5
Varity_R		0.038
gMVP		0.22

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: rs1480428015; hg19: chr17-53077199; COSMIC: COSV100178408;