rs1554777932

Variant names:

• chr9-127669958-G-A
• rs1554777932
• NM_003165.6:c.963G>A
• STXBP1 p.Lys321Lys

Your query was ambiguous. Multiple possible variants found:

• chr9-127669958-G-A
• chr9-127669958-G-C

GermlineCancer (beta)

Variant summary

Our verdict is Likely pathogenic.

+7 Likely Pathogenic

-7

-6

-1

0

+5

+6

+9

+10

BenignB

Likely BenignLB

UncertainVUS

Likely PathogenicLP

PathogenicP

The variant received 7 classification points (ACMG Germline Pathogenicity v2019). PM2PP3_StrongPP5

The NM_001032221.6(STXBP1):c.963G>A (p.Lys321Lys) variant causes a splice region, synonymous change involving the alteration of a conserved nucleotide. The variant is absent from the gnomAD population database at sites with sufficient sequencing coverage. In-silico predictor (BayesDel (noAF)) classifies this variant as likely benign. The affected nucleotide is highly conserved across species (PhyloP 100-way vertebrate score: 9.66). Variant has been reported in ClinVar as Pathogenic/Likely Pathogenic (no review stars).

• Frequency: Genomes: not found (cov: 31)
• Consequence: STXBP1 NM_001032221.6 splice_region, synonymous
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1
• Conservation: PhyloP100: 9.66
• Publications: 0 publications found

Genes affected

STXBP1 (HGNC:11444): (syntaxin binding protein 1) This gene encodes a syntaxin-binding protein. The encoded protein appears to play a role in release of neurotransmitters via regulation of syntaxin, a transmembrane attachment protein receptor. Mutations in this gene have been associated with infantile epileptic encephalopathy-4. Alternatively spliced transcript variants have been described. [provided by RefSeq, Feb 2010]

STXBP1 Gene-Disease associations (from GenCC):

• genetic developmental and epileptic encephalopathy

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• developmental and epileptic encephalopathy, 4

  Inheritance: AR, AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, PanelApp Australia, G2P, Labcorp Genetics (formerly Invitae)
• atypical Rett syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• autosomal dominant non-syndromic intellectual disability

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Dravet syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• undetermined early-onset epileptic encephalopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• autism spectrum disorder

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
• intellectual disability

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

Classification according to ACMG Germline Pathogenicity v2019

Our verdict: Likely_pathogenic. The variant received 7 points.

• PM2: Absent from gnomAD (AD/XL gene) — PM2; Absent from gnomAD at well-covered site (MOI: AD+AR) (threshold 0.0001) — PM2 moderate.
• PP3: Splicing predictors (SpliceAI/dbscSNV) support significant splicing impact — strong computational evidence (PP3); Splicing verdict: pathogenic (Strong).; Germline computational verdict: not pathogenic.
• PP5: ClinVar 0-star pathogenic — supporting (PP5); ClinVar germline classification: Pathogenic/Likely Pathogenic, 0 star(s).

Variant Effect in Transcripts

Automated classification analysis was done for transcript: NM_001032221.6. You can select a different transcript below to see updated classification assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	STXBP1	NM_003165.6	MANE Plus Clinical	c.963G>A	p.Lys321Lys	splice_region synonymous	Exon 11 of 20	NP_003156.1	P61764-2
	STXBP1	NM_001032221.6	MANE Select	c.963G>A	p.Lys321Lys	splice_region synonymous	Exon 11 of 19	NP_001027392.1	P61764-1
	STXBP1	NM_001374306.2		c.954G>A	p.Lys318Lys	splice_region synonymous	Exon 11 of 19	NP_001361235.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	STXBP1	ENST00000373302.8	TSL:1 MANE Plus Clinical	c.963G>A	p.Lys321Lys	splice_region synonymous	Exon 11 of 20	ENSP00000362399.3	P61764-2
	STXBP1	ENST00000373299.5	TSL:1 MANE Select	c.963G>A	p.Lys321Lys	splice_region synonymous	Exon 11 of 19	ENSP00000362396.2	P61764-1
	STXBP1	ENST00000494254.4	TSL:5	c.963G>A	p.Lys321Lys	splice_region synonymous	Exon 11 of 19	ENSP00000485397.2	A0A096LP52

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 31

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	1	-	Early-infantile DEE (1)
1	-	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.13
CADD	Benign	23
DANN	Benign	0.94
PhyloP100		9.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.8

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.99
SpliceAI score (max)		0.92		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.92		Position offset: 0

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs1554777932;

hg19: chr9-130432237;

ACMG debug oncogenicity

ACGS debug oncogenicity

ACMG debug germline

Submit to ClinVar