11-66700998-A-T

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 3P and 4B. PM2 PP2 BP4_Strong

The NM_006946.4(SPTBN2):c.3101T>A(p.Val1034Glu) variant causes a missense 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. 15/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V1034A) has been classified as Benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SPTBN2 NM_006946.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.199

Genes affected

SPTBN2 (HGNC:11276): (spectrin beta, non-erythrocytic 2) Spectrins are principle components of a cell's membrane-cytoskeleton and are composed of two alpha and two beta spectrin subunits. The protein encoded by this gene (SPTBN2), is called spectrin beta non-erythrocytic 2 or beta-III spectrin. It is related to, but distinct from, the beta-II spectrin gene which is also known as spectrin beta non-erythrocytic 1 (SPTBN1). SPTBN2 regulates the glutamate signaling pathway by stabilizing the glutamate transporter EAAT4 at the surface of the plasma membrane. Mutations in this gene cause a form of spinocerebellar ataxia, SCA5, that is characterized by neurodegeneration, progressive locomotor incoordination, dysarthria, and uncoordinated eye movements. [provided by RefSeq, Dec 2009]

ACMG classification

Verdict is Likely_benign. Variant got -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, SPTBN2
• BP4: Computational evidence support a benign effect (MetaRNN=0.015538514).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SPTBN2	NM_006946.4	c.3101T>A	p.Val1034Glu	missense_variant	17/38	ENST00000533211.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SPTBN2	ENST00000533211.6	c.3101T>A	p.Val1034Glu	missense_variant	17/38	5	NM_006946.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.074
BayesDel_addAF	Benign	-0.27	T
BayesDel_noAF	Benign	-0.62
Cadd	Benign	10
Dann	Benign	0.23
DEOGEN2	Benign	0.064	T;T;.
Eigen	Benign	-1.4
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.036	N
M_CAP	Benign	0.0056	T
MetaRNN	Benign	0.016	T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	-1.7	N;N;N
MutationTaster	Benign	1.0	P;P;P
PrimateAI	Benign	0.36	T
PROVEAN	Benign	3.0	N;N;N
REVEL	Benign	0.19
Sift	Benign	1.0	T;T;T
Sift4G	Benign	1.0	T;T;T
Polyphen		0.0	B;B;.
Vest4		0.056
MutPred		0.42		Gain of disorder (P = 0.0093);Gain of disorder (P = 0.0093);Gain of disorder (P = 0.0093);
MVP		0.068
MPC		0.69
ClinPred		0.041	T
GERP RS		4.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.2
Varity_R		0.069
gMVP		0.15

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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

Other links and lift over

dbSNP: rs506028; hg19: chr11-66468469;