rs763945497

Variant names:

• chr11-66700767-C-A
• rs763945497
• NM_006946.4:c.3332G>T

Your query was ambiguous. Multiple possible variants found:

• chr11-66700767-C-A
• chr11-66700767-C-G
• chr11-66700767-C-T

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_006946.4(SPTBN2):​c.3332G>T​(p.Arg1111Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000069 in 1,449,786 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/22 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. R1111Q) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: SPTBN2 NM_006946.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.63
• Publications: 0 publications found

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]

SPTBN2 Gene-Disease associations (from GenCC):

• spinocerebellar ataxia type 5

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: PanelApp Australia, ClinGen, G2P, Orphanet, Labcorp Genetics (formerly Invitae), Illumina
• autosomal recessive spinocerebellar ataxia 14

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: PanelApp Australia, G2P, Orphanet, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.33430648).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006946.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SPTBN2	NM_006946.4	MANE Select	c.3332G>T	p.Arg1111Leu	missense	Exon 17 of 38	NP_008877.2	O15020-1
	SPTBN2	NM_001411025.1		c.3353G>T	p.Arg1118Leu	missense	Exon 15 of 36	NP_001397954.1	A0A087WYQ1
	SPTBN2	NM_001437541.1		c.3332G>T	p.Arg1111Leu	missense	Exon 16 of 37	NP_001424470.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SPTBN2	ENST00000533211.6	TSL:5 MANE Select	c.3332G>T	p.Arg1111Leu	missense	Exon 17 of 38	ENSP00000432568.1	O15020-1
	SPTBN2	ENST00000309996.7	TSL:1	c.3332G>T	p.Arg1111Leu	missense	Exon 16 of 37	ENSP00000311489.2	O15020-1
	SPTBN2	ENST00000617502.5	TSL:5	c.3353G>T	p.Arg1118Leu	missense	Exon 15 of 36	ENSP00000482000.2	A0A087WYQ1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.90e-7 AC: 1 AN: 1449786 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 721772

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33472

American (AMR) AF: 0.00 AC: 0 AN: 44678

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26104

East Asian (EAS) AF: 0.0000252 AC: 1 AN: 39680

South Asian (SAS) AF: 0.00 AC: 0 AN: 86216

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 41828

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111760

Other (OTH) AF: 0.00 AC: 0 AN: 60282

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Benign	-0.065	T
BayesDel_noAF	Benign	-0.33
CADD	Uncertain	23
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.43	T
Eigen	Benign	0.023
Eigen_PC	Benign	0.098
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Benign	0.72	T
M_CAP	Benign	0.018	T
MetaRNN	Benign	0.33	T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	0.94	L
PhyloP100		1.6
PrimateAI	Uncertain	0.68	T
PROVEAN	Pathogenic	-4.5	D
REVEL	Benign	0.15
Sift	Uncertain	0.019	D
Sift4G	Uncertain	0.0020	D
Polyphen		0.52	P
Vest4		0.30
MutPred		0.59		Loss of methylation at R1111 (P = 0.0273)
MVP		0.46
MPC		1.1
ClinPred		0.98	D
GERP RS		4.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.40
gMVP		0.44
Mutation Taster		=72/28	polymorphism

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

Other links and lift over

dbSNP: rs763945497; hg19: chr11-66468238;