6-83582354-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001242792.2(SNAP91):c.2017T>C(p.Phe673Leu) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.000000685 in 1,459,244 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 1/1 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: SNAP91 NM_001242792.2 missense, splice_region
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.79

Genes affected

SNAP91 (HGNC:14986): (synaptosome associated protein 91) Predicted to enable several functions, including SNARE binding activity; clathrin binding activity; and phosphatidylinositol binding activity. Acts upstream of or within regulation of clathrin-dependent endocytosis. Predicted to be located in several cellular components, including postsynaptic density; presynaptic endosome; and presynaptic membrane. Predicted to be extrinsic component of endosome membrane. Predicted to be active in several cellular components, including Schaffer collateral - CA1 synapse; cytoplasmic vesicle; and parallel fiber to Purkinje cell synapse. Predicted to be extrinsic component of presynaptic endocytic zone membrane. Biomarker of Alzheimer's disease. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.33989227).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SNAP91	NM_001242792.2	c.2017T>C	p.Phe673Leu	missense_variant, splice_region_variant	23/30	ENST00000369694.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SNAP91	ENST00000369694.7	c.2017T>C	p.Phe673Leu	missense_variant, splice_region_variant	23/30	5	NM_001242792.2	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1459244 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 725754

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 0.00

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 17, 2023

The c.2017T>C (p.F673L) alteration is located in exon 23 (coding exon 22) of the SNAP91 gene. This alteration results from a T to C substitution at nucleotide position 2017, causing the phenylalanine (F) at amino acid position 673 to be replaced by a leucine (L). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.81
BayesDel_addAF	Uncertain	0.059	T
BayesDel_noAF	Benign	-0.15
Cadd	Uncertain	25
Dann	Uncertain	0.99
DEOGEN2	Benign	0.029	T;T;T;T;T;.;.;.;.
Eigen	Uncertain	0.49
Eigen_PC	Uncertain	0.51
FATHMM_MKL	Pathogenic	0.98	D
M_CAP	Benign	0.0096	T
MetaRNN	Benign	0.32	T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-1.1	T
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.77	T
PROVEAN	Uncertain	-2.6	D;N;D;N;N;N;N;N;N
REVEL	Benign	0.20
Sift	Benign	0.12	T;T;T;T;T;T;T;D;T
Sift4G	Benign	0.16	T;T;T;T;T;T;T;T;.
Polyphen		0.93, 0.95	.;P;.;P;P;.;P;.;.
Vest4		0.58
MutPred		0.23		Gain of glycosylation at S676 (P = 0.0902);Gain of glycosylation at S676 (P = 0.0902);Gain of glycosylation at S676 (P = 0.0902);Gain of glycosylation at S676 (P = 0.0902);Gain of glycosylation at S676 (P = 0.0902);.;.;.;.;
MVP		0.58
MPC		0.62
ClinPred		0.93	D
GERP RS		5.6
Varity_R		0.21
gMVP		0.23

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr6-84292073;