Genetic Variant STXBP1:p.Ala8Ala (chr9-127612427-T-C) – ACMG Classification: Benign (-7 pts)

Variant summary

Our verdict is Benign. The variant received -7 ACMG points: 0P and 7B. BP4_StrongBP6_ModerateBP7

The NM_001032221.6(STXBP1):c.24T>C(p.Ala8Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000623 in 1,445,544 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

Frequency

Genomes: not found (cov: 30)

Exomes 𝑓: 0.0000062 ( 0 hom. )

Consequence

STXBP1
NM_001032221.6 synonymous

Scores

Clinical Significance

Likely benign criteria provided, single submitter B:1

Conservation

PhyloP100: -0.772

Publications

0 publications found

Variant links:

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):

developmental and epileptic encephalopathy, 4
Inheritance: AD, AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
genetic developmental and epileptic encephalopathy
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
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
infantile spasms
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

STXBP1 links:

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ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -7 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.68).

BP6

Variant 9-127612427-T-C is Benign according to our data. Variant chr9-127612427-T-C is described in ClinVar as [Likely_benign]. Clinvar id is 1998923.Status of the report is criteria_provided_single_submitter, 1 stars.

BP7

Synonymous conserved (PhyloP=-0.772 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
STXBP1	NM_003165.6 link	c.24T>C	p.Ala8Ala	synonymous_variant	Exon 1 of 20	ENST00000373302.8	NP_003156.1	P61764-2
STXBP1	NM_001032221.6 link	c.24T>C	p.Ala8Ala	synonymous_variant	Exon 1 of 19	ENST00000373299.5	NP_001027392.1	P61764-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
STXBP1	ENST00000373302.8 link	c.24T>C	p.Ala8Ala	synonymous_variant	Exon 1 of 20	1	NM_003165.6	ENSP00000362399.3		P61764-2
STXBP1	ENST00000373299.5 link	c.24T>C	p.Ala8Ala	synonymous_variant	Exon 1 of 19	1	NM_001032221.6	ENSP00000362396.2		P61764-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000623

AC:

AN:

1445544

Hom.:

Cov.:

AF XY:

0.00000834

AC XY:

AN XY:

719008

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

31652

American (AMR)

AF:

0.00

AC:

AN:

43636

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25590

East Asian (EAS)

AF:

0.00

AC:

AN:

38418

South Asian (SAS)

AF:

0.00

AC:

AN:

84490

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51728

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5718

European-Non Finnish (NFE)

AF:

0.00000815

AC:

AN:

1104834

Other (OTH)

AF:

0.00

AC:

AN:

59478

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.458

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Developmental and epileptic encephalopathy

Benign:1

May 25, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.68

CADD

Benign

(source)

DANN

Benign

0.57

PhyloP100

-0.77

PromoterAI

0.023

Neutral

(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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9-127612427-T-C

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over