17-54999625-G-T

Variant names:

• chr17-54999625-G-T
• rs11658717
• NM_178509.6:c.288-7G>T

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PVS1_Strong PM2

The NM_001398481.1(STXBP4):​c.288-1G>T variant causes a splice acceptor, intron 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. 2/2 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: STXBP4 NM_001398481.1 splice_acceptor, intron
• Scores: Splicing: ADA: 0.00003839
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.24
• Publications: 29 publications found

Genes affected

STXBP4 (HGNC:19694): (syntaxin binding protein 4) Enables syntaxin binding activity. Involved in several processes, including positive regulation of cell cycle G1/S phase transition; positive regulation of keratinocyte proliferation; and protein stabilization. Located in extracellular exosome. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.13009593 fraction of the gene. Cryptic splice site detected, with MaxEntScore 8.4, offset of 6, new splice context is: tgatttctttttattactAGgtt. Cryptic site results in inframe change. If cryptic site found is not functional and variant results in exon loss, it results in frameshift change.
• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001398481.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	STXBP4	NM_178509.6	MANE Select	c.288-7G>T		splice_region intron	N/A	NP_848604.3	Q6ZWJ1-1
	STXBP4	NM_001398481.1		c.288-1G>T		splice_acceptor intron	N/A	NP_001385410.1
	STXBP4	NM_001398483.1		c.288-7G>T		splice_region intron	N/A	NP_001385412.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	STXBP4	ENST00000376352.6	TSL:2 MANE Select	c.288-7G>T		splice_region intron	N/A	ENSP00000365530.2	Q6ZWJ1-1
	STXBP4	ENST00000434978.6	TSL:1	c.288-7G>T		splice_region intron	N/A	ENSP00000391087.2	E7EPP7
	STXBP4	ENST00000398391.6	TSL:1	c.57-1G>T		splice_acceptor intron	N/A	ENSP00000381427.2	Q6ZWJ1-2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 110272

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.40	T
BayesDel_noAF	Benign	-0.82
CADD	Benign	0.80
DANN	Benign	0.72
Eigen	Benign	0.11
Eigen_PC	Benign	-0.21
FATHMM_MKL	Benign	0.036	N
PhyloP100		1.2
PromoterAI		0.0030	Neutral

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.000038
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

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

Other links and lift over

dbSNP: rs11658717;

hg19: chr17-53076986;