Genetic Variant NM_178509.6:c.1127T>C (chr17-55073015-T-C) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_178509.6(STXBP4):c.1127T>C(p.Leu376Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000821 in 1,461,698 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000082 ( 0 hom. )

Consequence

STXBP4
NM_178509.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.67

Variant links:

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]

STXBP4 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.859

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
STXBP4	NM_178509.6 link	c.1127T>C	p.Leu376Pro	missense_variant	Exon 13 of 18	ENST00000376352.6	NP_848604.3	Q6ZWJ1-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
STXBP4	ENST00000376352.6 link	c.1127T>C	p.Leu376Pro	missense_variant	Exon 13 of 18	2	NM_178509.6	ENSP00000365530.2		Q6ZWJ1-1
STXBP4	ENST00000434978.6 link	c.1061T>C	p.Leu354Pro	missense_variant	Exon 12 of 17	1		ENSP00000391087.2		E7EPP7

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000199

AC:

AN:

251018

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135642

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000545

Gnomad SAS exome

AF:

0.000131

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000821

AC:

AN:

1461698

Hom.:

Cov.:

AF XY:

0.00000963

AC XY:

AN XY:

727138

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000504

Gnomad4 SAS exome

AF:

0.000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Oct 29, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1127T>C (p.L376P) alteration is located in exon 13 (coding exon 11) of the STXBP4 gene. This alteration results from a T to C substitution at nucleotide position 1127, causing the leucine (L) at amino acid position 376 to be replaced by a proline (P). 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

0.94

BayesDel_addAF

Uncertain

0.090

BayesDel_noAF

Uncertain

0.13

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.29

T;T

Eigen

Pathogenic

0.82

Eigen_PC

Pathogenic

0.79

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.83

T;D

M_CAP

Uncertain

0.15

MetaRNN

Pathogenic

0.86

D;D

MetaSVM

Benign

-0.38

MutationAssessor

Uncertain

2.7

M;.

PrimateAI

Uncertain

0.68

PROVEAN

Uncertain

-4.1

D;D

REVEL

Uncertain

0.51

Sift

Uncertain

0.022

D;D

Sift4G

Uncertain

0.0040

D;D

Polyphen

1.0

D;D

Vest4

0.99

MutPred

0.39

Loss of stability (P = 0.0137);.;

MVP

0.87

MPC

0.84

ClinPred

0.94

GERP RS

5.6

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.87

gMVP

0.69

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

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