Genetic Variant STXBP2:p.Ala550Ser (chr19-7647463-G-T) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_006949.4(STXBP2):c.1648G>T(p.Ala550Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,459,398 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. A550T) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

STXBP2
NM_006949.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 8.04

Publications

0 publications found

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 Gene-Disease associations (from GenCC):

familial hemophagocytic lymphohistiocytosis 5
Inheritance: AR, AD Classification: DEFINITIVE, STRONG, LIMITED Submitted by: Ambry Genetics, ClinGen, Labcorp Genetics (formerly Invitae)
hereditary hemophagocytic lymphohistiocytosis
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
microvillus inclusion disease
Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics

STXBP2 links:

ENSG00000268400 (HGNC:):

ENSG00000268400 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
STXBP2	NM_006949.4 link	c.1648G>T	p.Ala550Ser	missense_variant	Exon 18 of 19	ENST00000221283.10	NP_008880.2	Q15833-1Q53GF4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
STXBP2	ENST00000221283.10 link	c.1648G>T	p.Ala550Ser	missense_variant	Exon 18 of 19	1	NM_006949.4	ENSP00000221283.4	Q15833-1
ENSG00000268400	ENST00000698368.1 link	n.*1751G>T		non_coding_transcript_exon_variant	Exon 20 of 20			ENSP00000513686.1	A0A8V8TM65
ENSG00000268400	ENST00000698368.1 link	n.*1751G>T		3_prime_UTR_variant	Exon 20 of 20			ENSP00000513686.1	A0A8V8TM65

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1459398

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

725866

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33402

American (AMR)

AF:

0.00

AC:

AN:

44498

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26050

East Asian (EAS)

AF:

0.00

AC:

AN:

39568

South Asian (SAS)

AF:

0.00

AC:

AN:

85904

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52984

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5752

European-Non Finnish (NFE)

AF:

9.00e-7

AC:

AN:

1110978

Other (OTH)

AF:

0.00

AC:

AN:

60262

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.30

BayesDel_addAF

Pathogenic

0.24

BayesDel_noAF

Uncertain

0.10

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.71

.;D;.;D

Eigen

Pathogenic

0.94

Eigen_PC

Pathogenic

0.89

FATHMM_MKL

Uncertain

0.97

LIST_S2

Uncertain

0.96

D;D;D;D

M_CAP

Uncertain

0.18

MetaRNN

Uncertain

0.69

D;D;D;D

MetaSVM

Uncertain

0.61

MutationAssessor

Pathogenic

3.3

.;M;.;.

PhyloP100

8.0

PrimateAI

Uncertain

0.60

PROVEAN

Uncertain

-2.8

D;D;D;.

REVEL

Pathogenic

0.73

Sift

Uncertain

0.0040

D;D;D;.

Sift4G

Uncertain

0.0060

D;D;D;D

Polyphen

1.0

.;D;D;.

Vest4

0.64

MutPred

0.73

.;Gain of disorder (P = 0.0261);.;.;

MVP

0.91

MPC

0.82

ClinPred

0.98

GERP RS

5.3

RBP_binding_hub_radar

0.97

RBP_regulation_power_radar

2.8

Varity_R

0.88

gMVP

0.69

Mutation Taster

=32/68

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over