chr11-66686005-G-A

Position:

• chr11-66686005-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 1P and 1B. PP2 BP4

The NM_006946.4(SPTBN2):​c.7039C>T​(p.Arg2347Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000253 in 1,461,370 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R2347Q) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000025 (0 hom.)
• Consequence: SPTBN2 NM_006946.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3 B:1
• Conservation: PhyloP100: 1.98

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 Uncertain_significance. Variant got 0 ACMG points.

• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), SPTBN2. . Gene score misZ 2.6349 (greater than the threshold 3.09). Trascript score misZ 4.499 (greater than threshold 3.09). GenCC has associacion of gene with autosomal recessive spinocerebellar ataxia 14, spinocerebellar ataxia type 5.
• BP4: Computational evidence support a benign effect (MetaRNN=0.27743375).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SPTBN2	NM_006946.4	c.7039C>T	p.Arg2347Trp	missense_variant	38/38	ENST00000533211.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SPTBN2	ENST00000533211.6	c.7039C>T	p.Arg2347Trp	missense_variant	38/38	5	NM_006946.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000201 AC: 5 AN: 248628 Hom.: 0 AF XY: 0.0000222 AC XY: 3 AN XY: 135026

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000289

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: 0.0000268

Gnomad OTH exome AF: 0.000164

GnomAD4 exome AF: 0.0000253 AC: 37 AN: 1461370 Hom.: 0 Cov.: 31 AF XY: 0.0000248 AC XY: 18 AN XY: 726996

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

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: 0.0000261

Gnomad4 OTH exome AF: 0.0000331

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000712 Hom.: 0

Bravo AF: 0.0000189

ExAC AF: 0.0000165 AC: 2

EpiCase AF: 0.00

EpiControl AF: 0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:2 Benign:1

Uncertain significance, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Athena Diagnostics	Oct 15, 2020	- -
Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jul 25, 2022	- -

Spinocerebellar ataxia type 5;C4706415:Autosomal recessive spinocerebellar ataxia 14 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Apr 12, 2022

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.22
BayesDel_addAF	Benign	-0.057	T
BayesDel_noAF	Benign	-0.24
CADD	Uncertain	25
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.21	T;T;.;.
Eigen	Uncertain	0.40
Eigen_PC	Uncertain	0.44
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Uncertain	0.94	.;D;.;D
M_CAP	Benign	0.065	D
MetaRNN	Benign	0.28	T;T;T;T
MetaSVM	Benign	-0.47	T
MutationAssessor	Benign	0.34	N;N;.;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.70	T
PROVEAN	Benign	-1.4	N;N;.;.
REVEL	Benign	0.24
Sift	Uncertain	0.0040	D;D;.;.
Sift4G	Uncertain	0.0090	D;D;D;D
Polyphen		1.0	D;D;.;.
Vest4		0.41
MutPred		0.24		Loss of methylation at R2347 (P = 0.021);Loss of methylation at R2347 (P = 0.021);.;.;
MVP		0.41
MPC		1.1
ClinPred		0.48	T
GERP RS		5.6
Varity_R		0.20
gMVP		0.37

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

Other links and lift over

dbSNP: rs746195427; hg19: chr11-66453476; COSMIC: COSV59450368; COSMIC: COSV59450368;