Genetic Variant STXBP5L:p.Asp250His (chr3-121152555-G-C) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001308330.2(STXBP5L):c.748G>C(p.Asp250His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000138 in 1,447,028 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

STXBP5L
NM_001308330.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 9.09

Variant links:

Genes affected

STXBP5L (HGNC:30757): (syntaxin binding protein 5L) The protein encoded by this gene is similar to syntaxin-binding protein 5 and contains ten N-terminal WD40 repeats, four variable region WD40 repeats, and a C-terminal R-SNARE domain. Studies of the orthologous proteins in mouse and rat have shown that the encoded protein may inhibit exocytosis in neurosecretory cells, and may negatively regulate the secretion of insulin. A missense variant in this gene is likely the cause of an infantile-onset neurodegenerative disorder diagnosed in two siblings of consanguineous parents. [provided by RefSeq, Jan 2017]

STXBP5L links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
STXBP5L	NM_001308330.2 link	c.748G>C	p.Asp250His	missense_variant	Exon 8 of 27	ENST00000471454.6	NP_001295259.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
STXBP5L	ENST00000471454.6 link	c.748G>C	p.Asp250His	missense_variant	Exon 8 of 27	2	NM_001308330.2	ENSP00000420019.1		E9PFI2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000829

AC:

AN:

241124

Hom.:

AF XY:

0.0000152

AC XY:

AN XY:

131390

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000673

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000138

AC:

AN:

1447028

Hom.:

Cov.:

AF XY:

0.00000278

AC XY:

AN XY:

720630

show subpopulations

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:

0.0000234

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000828

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Feb 28, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.748G>C (p.D250H) alteration is located in exon 8 (coding exon 7) of the STXBP5L gene. This alteration results from a G to C substitution at nucleotide position 748, causing the aspartic acid (D) at amino acid position 250 to be replaced by a histidine (H). 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

0.90

BayesDel_addAF

Uncertain

0.038

BayesDel_noAF

Uncertain

0.0

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Benign

0.18

T;T;T;T;.;T

Eigen

Pathogenic

0.74

Eigen_PC

Pathogenic

0.76

FATHMM_MKL

Uncertain

0.96

LIST_S2

Pathogenic

0.98

D;D;D;D;D;D

M_CAP

Benign

0.040

MetaRNN

Uncertain

0.65

D;D;D;D;D;D

MetaSVM

Benign

-0.62

MutationAssessor

Benign

2.0

M;.;.;.;.;.

PrimateAI

Pathogenic

0.83

PROVEAN

Pathogenic

-5.1

D;D;D;D;D;D

REVEL

Uncertain

0.41

Sift

Uncertain

0.0040

D;D;D;D;D;D

Sift4G

Benign

0.069

T;T;T;T;T;T

Polyphen

1.0

D;D;.;.;.;.

Vest4

0.90

MutPred

0.49

Loss of catalytic residue at D250 (P = 0.0056);Loss of catalytic residue at D250 (P = 0.0056);Loss of catalytic residue at D250 (P = 0.0056);Loss of catalytic residue at D250 (P = 0.0056);Loss of catalytic residue at D250 (P = 0.0056);Loss of catalytic residue at D250 (P = 0.0056);

MVP

0.40

MPC

0.79

ClinPred

0.95

GERP RS

5.4

Varity_R

0.72

gMVP

0.57

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.040

Details are displayed if max score is > 0.2

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over