19-7640796-C-A

Variant names:

• chr19-7640796-C-A
• NM_006949.4:c.312C>A
• STXBP2 p.Ile104Ile

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_006949.4(STXBP2):​c.312C>A​(p.Ile104Ile) variant causes a synonymous 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. Synonymous variant affecting the same amino acid position (i.e. I104I) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: STXBP2 NM_006949.4 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.01
• Publications: 0 publications found

Genes affected

STXBP2 (HGNC:11445): (syntaxin binding protein 2) This gene encodes a member of the STXBP/unc-18/SEC1 family. The encoded protein is involved in intracellular trafficking, control of SNARE (soluble NSF attachment protein receptor) complex assembly, and the release of cytotoxic granules by natural killer cells. Mutations in this gene are associated with familial hemophagocytic lymphohistiocytosis. Alternatively spliced transcript variants encoding different isoforms have been noted for this gene. [provided by RefSeq, Jan 2013]

STXBP2 Gene-Disease associations (from GenCC):

• familial hemophagocytic lymphohistiocytosis 5

  Inheritance: AD, AR Classification: DEFINITIVE, STRONG, LIMITED Submitted by: Ambry Genetics, PanelApp Australia, Labcorp Genetics (formerly Invitae), ClinGen
• hereditary hemophagocytic lymphohistiocytosis

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• microvillus inclusion disease

  Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics

ENSG00000268400 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.49).
• BP7: Synonymous conserved (PhyloP=1.01 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006949.4. 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
	STXBP2	NM_006949.4	MANE Select	c.312C>A	p.Ile104Ile	synonymous	Exon 5 of 19	NP_008880.2	Q15833-1
	STXBP2	NM_001272034.2		c.345C>A	p.Ile115Ile	synonymous	Exon 5 of 19	NP_001258963.1	Q15833-3
	STXBP2	NM_001127396.3		c.303C>A	p.Ile101Ile	synonymous	Exon 5 of 19	NP_001120868.1	Q15833-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	STXBP2	ENST00000221283.10	TSL:1 MANE Select	c.312C>A	p.Ile104Ile	synonymous	Exon 5 of 19	ENSP00000221283.4	Q15833-1
	STXBP2	ENST00000414284.6	TSL:1	c.303C>A	p.Ile101Ile	synonymous	Exon 5 of 19	ENSP00000409471.1	Q15833-2
	STXBP2	ENST00000597068.5	TSL:1	n.312C>A		non_coding_transcript_exon	Exon 5 of 19	ENSP00000471327.1	M0R0M7

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.49
CADD	Benign	4.8
DANN	Benign	0.64
PhyloP100		1.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

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

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

Other links and lift over

hg19: chr19-7705682;