Genetic Variant SPTBN4:p.Arg34Trp (chr19-40472721-C-T) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_020971.3(SPTBN4):c.100C>T(p.Arg34Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000162 in 1,608,710 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000072 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000010 ( 0 hom. )

Consequence

SPTBN4
NM_020971.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.11

Variant links:

Genes affected

SPTBN4 (HGNC:14896): (spectrin beta, non-erythrocytic 4) Spectrin is an actin crosslinking and molecular scaffold protein that links the plasma membrane to the actin cytoskeleton, and functions in the determination of cell shape, arrangement of transmembrane proteins, and organization of organelles. It is composed of two antiparallel dimers of alpha- and beta- subunits. This gene is one member of a family of beta-spectrin genes. The encoded protein localizes to the nuclear matrix, PML nuclear bodies, and cytoplasmic vesicles. A highly similar gene in the mouse is required for localization of specific membrane proteins in polarized regions of neurons. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

SPTBN4 links:

Genome browser will be placed here

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
SPTBN4	NM_020971.3 link	c.100C>T	p.Arg34Trp	missense_variant	Exon 2 of 36	ENST00000598249.6	NP_066022.2	Q9H254-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
SPTBN4	ENST00000598249.6 link	c.100C>T	p.Arg34Trp	missense_variant	Exon 2 of 36	1	NM_020971.3	ENSP00000469242.1	Q9H254-1
SPTBN4	ENST00000352632.7 link	c.100C>T	p.Arg34Trp	missense_variant	Exon 2 of 36	5		ENSP00000263373.2	Q9H254-1
SPTBN4	ENST00000595535.5 link	c.100C>T	p.Arg34Trp	missense_variant	Exon 2 of 27	5		ENSP00000470693.1	M0QZQ3

Frequencies

GnomAD3 genomes

AF:

0.0000724

AC:

AN:

151892

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000967

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000209

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000882

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000836

AC:

AN:

239288

Hom.:

AF XY:

0.00

AC XY:

AN XY:

130388

show subpopulations

Gnomad AFR exome

AF:

0.000134

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000103

AC:

AN:

1456818

Hom.:

Cov.:

AF XY:

0.00000690

AC XY:

AN XY:

724442

show subpopulations

Gnomad4 AFR exome

AF:

0.0000898

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000117

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000901

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000724

AC:

AN:

151892

Hom.:

Cov.:

AF XY:

0.0000539

AC XY:

AN XY:

74164

show subpopulations

Gnomad4 AFR

AF:

0.0000967

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000209

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000882

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000658

Hom.:

Bravo

AF:

0.0000907

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.00000826

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Jan 10, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.100C>T (p.R34W) alteration is located in exon 2 (coding exon 1) of the SPTBN4 gene. This alteration results from a C to T substitution at nucleotide position 100, causing the arginine (R) at amino acid position 34 to be replaced by a tryptophan (W). 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

Benign

0.16

BayesDel_addAF

Benign

-0.048

BayesDel_noAF

Uncertain

-0.060

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.022

.;T;T;T;T

Eigen

Benign

0.11

Eigen_PC

Benign

0.18

FATHMM_MKL

Benign

0.62

LIST_S2

Uncertain

0.88

D;.;.;D;D

M_CAP

Uncertain

0.26

MetaRNN

Uncertain

0.71

D;D;D;D;D

MetaSVM

Uncertain

-0.18

MutationAssessor

Benign

0.69

.;.;N;N;.

PrimateAI

Uncertain

0.61

PROVEAN

Benign

-1.6

.;.;N;.;N

REVEL

Uncertain

0.54

Sift

Uncertain

0.0060

.;.;D;.;D

Sift4G

Uncertain

0.016

D;D;D;D;D

Polyphen

1.0

.;.;D;D;.

Vest4

0.70

MVP

0.76

ClinPred

0.45

GERP RS

4.0

Varity_R

0.087

gMVP

0.50

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