chr9-127668131-C-T

Position:

• chr9-127668131-C-T

Variant summary

Our verdict is Benign. Variant got -19 ACMG points: 0P and 19B. BP4_Moderate BP6_Very_Strong BP7 BA1

The NM_003165.6(STXBP1):​c.846C>T​(p.Asp282=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.009 in 1,614,048 control chromosomes in the GnomAD database, including 1,130 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.047 (599 hom., cov: 32)
  • Exomes 𝑓: 0.0050 (531 hom.)
• Consequence: STXBP1 NM_003165.6 synonymous
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:6
• Conservation: PhyloP100: -2.15

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]

ACMG classification

Verdict is Benign. Variant got -19 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.28).
• BP6: Variant 9-127668131-C-T is Benign according to our data. Variant chr9-127668131-C-T is described in ClinVar as [Benign]. Clinvar id is 139348.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=-2.15 with no splicing effect.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.162 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
STXBP1	NM_003165.6	c.846C>T	p.Asp282=	synonymous_variant	10/20	ENST00000373302.8
STXBP1	NM_001032221.6	c.846C>T	p.Asp282=	synonymous_variant	10/19	ENST00000373299.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
STXBP1	ENST00000373302.8	c.846C>T	p.Asp282=	synonymous_variant	10/20	1	NM_003165.6	P3
STXBP1	ENST00000373299.5	c.846C>T	p.Asp282=	synonymous_variant	10/19	1	NM_001032221.6	A1

Frequencies

GnomAD3 genomes AF: 0.0473 AC: 7194 AN: 152078 Hom.: 595 Cov.: 32

Gnomad AFR AF: 0.165

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0172

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000414

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00949

Gnomad NFE AF: 0.000706

Gnomad OTH AF: 0.0263

GnomAD3 exomes AF: 0.0122 AC: 3067 AN: 251232 Hom.: 233 AF XY: 0.00895 AC XY: 1216 AN XY: 135810

Gnomad AFR exome AF: 0.168

Gnomad AMR exome AF: 0.00700

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000229

Gnomad FIN exome AF: 0.0000463

Gnomad NFE exome AF: 0.000423

Gnomad OTH exome AF: 0.00685

GnomAD4 exome AF: 0.00499 AC: 7297 AN: 1461852 Hom.: 531 Cov.: 32 AF XY: 0.00425 AC XY: 3092 AN XY: 727236

Gnomad4 AFR exome AF: 0.172

Gnomad4 AMR exome AF: 0.00865

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.000394

Gnomad4 FIN exome AF: 0.0000375

Gnomad4 NFE exome AF: 0.000399

Gnomad4 OTH exome AF: 0.0101

GnomAD4 genome AF: 0.0475 AC: 7223 AN: 152196 Hom.: 599 Cov.: 32 AF XY: 0.0457 AC XY: 3405 AN XY: 74430

Gnomad4 AFR AF: 0.165

Gnomad4 AMR AF: 0.0171

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000706

Gnomad4 OTH AF: 0.0260

Alfa AF: 0.0238 Hom.: 110

Bravo AF: 0.0537

Asia WGS AF: 0.0130 AC: 47 AN: 3478

EpiCase AF: 0.000763

EpiControl AF: 0.000474

ClinVar

Significance: Benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:3

Benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 02, 2012	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Likely benign, no assertion criteria provided	clinical testing	Genetic Services Laboratory, University of Chicago	-	- -

Inborn genetic diseases Benign:1

Benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 18, 2016

This alteration is classified as 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. -

Early infantile epileptic encephalopathy with suppression bursts Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Feb 01, 2024

- -

not provided Benign:1

Benign, criteria provided, single submitter

clinical testing

Athena Diagnostics

Sep 29, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.28
CADD	Benign	3.6
DANN	Benign	0.71

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: rs58889246; hg19: chr9-130430410;