11-66710612-T-C

Position:

• chr11-66710612-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM5 PP2 BP4_Moderate

The NM_006946.4(SPTBN2):​c.1043A>G​(p.Asn348Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000616 in 1,461,732 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 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. N348D) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000062 (0 hom.)
• Consequence: SPTBN2 NM_006946.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.85

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 1 ACMG points.

• PM5: Other missense variant is known to change same aminoacid residue: Variant chr11-66710613-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 436854.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP2: Missense variant where missense usually causes diseases, SPTBN2
• BP4: Computational evidence support a benign effect (MetaRNN=0.22922468).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SPTBN2	NM_006946.4	c.1043A>G	p.Asn348Ser	missense_variant	10/38	ENST00000533211.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SPTBN2	ENST00000533211.6	c.1043A>G	p.Asn348Ser	missense_variant	10/38	5	NM_006946.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000400 AC: 1 AN: 250210 Hom.: 0 AF XY: 0.00000738 AC XY: 1 AN XY: 135540

Gnomad AFR exome AF: 0.00

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: 0.00000886

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000616 AC: 9 AN: 1461732 Hom.: 0 Cov.: 32 AF XY: 0.00000550 AC XY: 4 AN XY: 727148

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 0.00000809

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.082
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.46
CADD	Uncertain	23
DANN	Uncertain	0.99
DEOGEN2	Benign	0.24	T;T;.;.;.
Eigen	Benign	-0.043
Eigen_PC	Benign	0.10
FATHMM_MKL	Uncertain	0.90	D
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.23	T;T;T;T;T
MetaSVM	Benign	-0.86	T
MutationAssessor	Benign	1.4	L;L;.;L;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.57	T
PROVEAN	Benign	-1.6	N;N;.;N;.
REVEL	Benign	0.11
Sift	Benign	0.65	T;T;.;T;.
Sift4G	Benign	0.50	T;T;T;T;T
Polyphen		0.38	B;B;.;.;.
Vest4		0.37
MutPred		0.41		Gain of disorder (P = 0.0544);Gain of disorder (P = 0.0544);Gain of disorder (P = 0.0544);Gain of disorder (P = 0.0544);Gain of disorder (P = 0.0544);
MVP		0.79
MPC		1.2
ClinPred		0.70	D
GERP RS		5.0
Varity_R		0.19
gMVP		0.52

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: rs797046005; hg19: chr11-66478083;