rs201649843

Positions:

chr19-7642116-G-A

Variant summary

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

The NM_006949.4(STXBP2):c.661G>A(p.Glu221Lys) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.000168 in 1,614,096 control chromosomes in the GnomAD database, including 1 homozygotes. 2/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00012 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00017 ( 1 hom. )

Consequence

STXBP2
NM_006949.4 missense, splice_region

Scores

Splicing: ADA: 0.6049

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 6.46

Variant links:

Genes affected

STXBP2 (HGNC:11445): (syntaxin binding protein 2) This gene encodes a member of the STXBP/unc-18/SEC1 family. The encoded protein is involved in intracellular trafficking, control of SNARE (soluble NSF attachment protein receptor) complex assembly, and the release of cytotoxic granules by natural killer cells. Mutations in this gene are associated with familial hemophagocytic lymphohistiocytosis. Alternatively spliced transcript variants encoding different isoforms have been noted for this gene. [provided by RefSeq, Jan 2013]

STXBP2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
STXBP2	NM_006949.4 linkuse as main transcript	c.661G>A	p.Glu221Lys	missense_variant, splice_region_variant	8/19	ENST00000221283.10	NP_008880.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
STXBP2	ENST00000221283.10 linkuse as main transcript	c.661G>A	p.Glu221Lys	missense_variant, splice_region_variant	8/19	1	NM_006949.4	ENSP00000221283	P4	Q15833-1

Frequencies

GnomAD3 genomes

AF:

0.000125

AC:

AN:

152160

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000191

Gnomad OTH

AF:

0.000958

GnomAD3 exomes

AF:

0.000139

AC:

AN:

250952

Hom.:

AF XY:

0.000147

AC XY:

AN XY:

135764

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000521

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000141

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000172

AC:

252

AN:

1461824

Hom.:

Cov.:

AF XY:

0.000161

AC XY:

117

AN XY:

727212

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000425

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.000198

Gnomad4 OTH exome

AF:

0.000182

GnomAD4 genome

AF:

0.000125

AC:

AN:

152272

Hom.:

Cov.:

AF XY:

0.000134

AC XY:

AN XY:

74442

show subpopulations

Gnomad4 AFR

AF:

0.0000481

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000191

Gnomad4 OTH

AF:

0.000948

Alfa

AF:

0.000240

Hom.:

Bravo

AF:

0.000159

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000778

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000824

AC:

EpiCase

AF:

0.000327

EpiControl

AF:

0.000237

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 29, 2022

The c.661G>A (p.E221K) alteration is located in exon 8 (coding exon 8) of the STXBP2 gene. This alteration results from a G to A substitution at nucleotide position 661, causing the glutamic acid (E) at amino acid position 221 to be replaced by a lysine (K). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Familial hemophagocytic lymphohistiocytosis 5

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 01, 2022

This sequence change replaces glutamic acid, which is acidic and polar, with lysine, which is basic and polar, at codon 221 of the STXBP2 protein (p.Glu221Lys). This variant is present in population databases (rs201649843, gnomAD 0.05%), including at least one homozygous and/or hemizygous individual. This variant has not been reported in the literature in individuals affected with STXBP2-related conditions. ClinVar contains an entry for this variant (Variation ID: 567849). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). 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. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Apr 04, 2022

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.35

BayesDel_addAF

Benign

-0.064

BayesDel_noAF

Uncertain

0.020

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.41

.;.;T;.

Eigen

Uncertain

0.59

Eigen_PC

Uncertain

0.57

FATHMM_MKL

Uncertain

0.92

LIST_S2

Uncertain

0.94

D;D;D;D

M_CAP

Uncertain

0.13

MetaRNN

Uncertain

0.58

D;T;T;T

MetaSVM

Uncertain

0.0065

MutationAssessor

Benign

2.0

.;.;M;.

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Uncertain

0.65

PROVEAN

Uncertain

-2.8

.;D;D;D

REVEL

Uncertain

0.61

Sift

Benign

0.24

.;T;T;T

Sift4G

Uncertain

0.0050

D;T;T;T

Polyphen

1.0

.;.;D;D

Vest4

0.78, 0.78, 0.79

MVP

0.86

MPC

0.84

ClinPred

0.48

GERP RS

4.4

Varity_R

0.67

gMVP

0.61

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.60

dbscSNV1_RF

Pathogenic

0.77

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over