chr9-127612411-C-G

Variant names:

• chr9-127612411-C-G
• rs575515332
• NM_003165.6:c.8C>G

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 4P and 1B. PM1 PM2 BP4

The NM_003165.6(STXBP1):​c.8C>G​(p.Pro3Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 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. P3L) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 30)
• Consequence: STXBP1 NM_003165.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.438
• 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):

• 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

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 8 uncertain in NM_003165.6
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.39134148).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
STXBP1	NM_003165.6	c.8C>G	p.Pro3Arg	missense_variant	Exon 1 of 20	ENST00000373302.8	NP_003156.1
STXBP1	NM_001032221.6	c.8C>G	p.Pro3Arg	missense_variant	Exon 1 of 19	ENST00000373299.5	NP_001027392.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
STXBP1	ENST00000373302.8	c.8C>G	p.Pro3Arg	missense_variant	Exon 1 of 20	1	NM_003165.6	ENSP00000362399.3
STXBP1	ENST00000373299.5	c.8C>G	p.Pro3Arg	missense_variant	Exon 1 of 19	1	NM_001032221.6	ENSP00000362396.2

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 30

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.58
BayesDel_addAF	Benign	-0.038	T
BayesDel_noAF	Benign	-0.29
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.030	.;T;.;T;.
Eigen	Uncertain	0.28
Eigen_PC	Benign	0.18
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Uncertain	0.97	D;D;D;D;.
M_CAP	Pathogenic	0.99	D
MetaRNN	Benign	0.39	T;T;T;T;T
MetaSVM	Uncertain	0.067	D
MutationAssessor	Uncertain	2.0	M;.;.;M;.
PhyloP100		0.44
PrimateAI	Pathogenic	0.87	D
PROVEAN	Benign	-1.4	N;.;.;N;.
REVEL	Uncertain	0.38
Sift	Uncertain	0.0040	D;.;.;D;.
Sift4G	Uncertain	0.0070	D;.;.;D;.
Polyphen		0.98	D;.;.;D;.
Vest4		0.17
MutPred		0.51		Gain of MoRF binding (P = 0);Gain of MoRF binding (P = 0);Gain of MoRF binding (P = 0);Gain of MoRF binding (P = 0);Gain of MoRF binding (P = 0);
MVP		0.40
MPC		1.6
ClinPred		0.68	D
GERP RS		2.7
PromoterAI		0.0044	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.26
gMVP		0.78
Mutation Taster		=84/16	polymorphism

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

Other links and lift over

dbSNP: rs575515332; hg19: chr9-130374690;