2-54526450-A-G

Variant names:

• chr2-54526450-A-G
• rs1670821258
• NM_003128.3:c.32A>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_003128.3(SPTBN1):​c.32A>G​(p.Asn11Ser) variant causes a missense change. The variant allele was found at a frequency of 0.00000274 in 1,461,886 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. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: SPTBN1 NM_003128.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.34
• Publications: 0 publications found

Genes affected

SPTBN1 (HGNC:11275): (spectrin beta, non-erythrocytic 1) 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 contains an N-terminal actin-binding domain, and 17 spectrin repeats which are involved in dimer formation. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

SPTBN1-AS1 (HGNC:40562): (SPTBN1 antisense RNA 1)

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.2130835).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003128.3. 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
	SPTBN1	NM_003128.3	MANE Select	c.32A>G	p.Asn11Ser	missense	Exon 2 of 36	NP_003119.2	Q01082-1
	SPTBN1-AS1	NR_185881.1		n.1205-5985T>C		intron	N/A

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SPTBN1	ENST00000356805.9	TSL:1 MANE Select	c.32A>G	p.Asn11Ser	missense	Exon 2 of 36	ENSP00000349259.4	Q01082-1
	SPTBN1	ENST00000389980.7	TSL:1	c.32A>G	p.Asn11Ser	missense	Exon 2 of 14	ENSP00000374630.3	F8W6C1
	SPTBN1	ENST00000602898.1	TSL:1	n.677A>G		non_coding_transcript_exon	Exon 2 of 2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461886 Hom.: 0 Cov.: 30 AF XY: 0.00000138 AC XY: 1 AN XY: 727246

⚠️ 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: 33480

American (AMR) AF: 0.0000447 AC: 2 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1112004

Other (OTH) AF: 0.00 AC: 0 AN: 60396

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.00000000000213107), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.22	T
BayesDel_noAF	Benign	-0.56
CADD	Benign	20
DANN	Uncertain	0.98
DEOGEN2	Benign	0.41	T
Eigen	Benign	0.096
Eigen_PC	Uncertain	0.26
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.90	D
M_CAP	Benign	0.0053	T
MetaRNN	Benign	0.21	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.7	L
PhyloP100		5.3
PrimateAI	Uncertain	0.64	T
PROVEAN	Benign	-1.2	N
REVEL	Benign	0.090
Sift	Benign	0.47	T
Sift4G	Benign	0.29	T
Polyphen		0.0050	B
Vest4		0.077
MutPred		0.38		Gain of helix (P = 0.0696)
MVP		0.55
MPC		1.1
ClinPred		0.58	D
GERP RS		5.8
Varity_R		0.093
gMVP		0.79
Mutation Taster		=70/30	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: rs1670821258; hg19: chr2-54753587;