9-127612242-G-GCTCGCGCCGCGCC

Variant summary

Our verdict is Benign. Variant got -10 ACMG points: 0P and 10B. BP6_Moderate BS1 BS2

The ENST00000637953.1(STXBP1):c.-160_-148dup variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0014 in 589,374 control chromosomes in the GnomAD database, including 5 homozygotes. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.0050 (4 hom., cov: 30)
  • Exomes 𝑓: 0.00019 (1 hom.)
• Consequence: STXBP1 ENST00000637953.1 5_prime_UTR
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.505

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 -10 ACMG points.

• BP6: Variant 9-127612242-G-GCTCGCGCCGCGCC is Benign according to our data. Variant chr9-127612242-G-GCTCGCGCCGCGCC is described in ClinVar as [Likely_benign]. Clinvar id is 1195695.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.005 (739/147738) while in subpopulation AFR AF= 0.0167 (682/40902). AF 95% confidence interval is 0.0156. There are 4 homozygotes in gnomad4. There are 354 alleles in male gnomad4 subpopulation. Median coverage is 30. This position pass quality control queck.
• BS2: High AC in GnomAd at 738 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
STXBP1	NM_001032221.6			upstream_gene_variant		ENST00000373299.5
STXBP1	NM_003165.6			upstream_gene_variant		ENST00000373302.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
STXBP1	ENST00000373299.5			upstream_gene_variant		1	NM_001032221.6	A1
STXBP1	ENST00000373302.8			upstream_gene_variant		1	NM_003165.6	P3

Frequencies

GnomAD3 genomes AF: 0.00500 AC: 738 AN: 147628 Hom.: 4 Cov.: 30

Gnomad AFR AF: 0.0167

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00349

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: 0.00

Gnomad OTH AF: 0.00245

GnomAD4 exome AF: 0.000195 AC: 86 AN: 441636 Hom.: 1 Cov.: 8 AF XY: 0.000179 AC XY: 40 AN XY: 223806

Gnomad4 AFR exome AF: 0.00901

Gnomad4 AMR exome AF: 0.000889

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000277

Gnomad4 OTH exome AF: 0.000670

GnomAD4 genome AF: 0.00500 AC: 739 AN: 147738 Hom.: 4 Cov.: 30 AF XY: 0.00492 AC XY: 354 AN XY: 71998

Gnomad4 AFR AF: 0.0167

Gnomad4 AMR AF: 0.00349

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00242

Alfa AF: 0.00379 Hom.: 0

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Jul 27, 2018

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Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs556763394; hg19: chr9-130374521;