chr2-54664591-A-G

Variant names:

• chr2-54664591-A-G
• NM_003128.3:c.6559A>G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 5P and 1B. PM1 PM2 PP2 BP4

The NM_003128.3(SPTBN1):​c.6559A>G​(p.Thr2187Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SPTBN1 NM_003128.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.30

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-AS2 (HGNC:40563): (SPTBN1 antisense RNA 2)

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a modified_residue Phosphothreonine (size 0) in uniprot entity SPTB2_HUMAN
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the SPTBN1 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 13 curated pathogenic missense variants (we use a threshold of 10). The gene has 20 curated benign missense variants. Gene score misZ: 4.5424 (above the threshold of 3.09). Trascript score misZ: 5.885 (above the threshold of 3.09). GenCC associations: The gene is linked to developmental delay, impaired speech, and behavioral abnormalities.
• BP4: Computational evidence support a benign effect (MetaRNN=0.41580603).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SPTBN1	NM_003128.3	c.6559A>G	p.Thr2187Ala	missense_variant	Exon 33 of 36	ENST00000356805.9	NP_003119.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SPTBN1	ENST00000356805.9	c.6559A>G	p.Thr2187Ala	missense_variant	Exon 33 of 36	1	NM_003128.3	ENSP00000349259.4
SPTBN1	ENST00000615901.4	c.6565A>G	p.Thr2189Ala	missense_variant	Exon 35 of 38	5
SPTBN1	ENST00000467371.1	n.1691A>G		non_coding_transcript_exon_variant	Exon 1 of 4	2
SPTBN1-AS2	ENST00000626206.1	n.466+7T>C		splice_region_variant, intron_variant	Intron 2 of 3	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

SPTBN1-related disorder Uncertain:1

Dec 01, 2022

PreventionGenetics, part of Exact Sciences

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The SPTBN1 c.6559A>G variant is predicted to result in the amino acid substitution p.Thr2187Ala. To our knowledge, this variant has not been reported in the literature or in a large population database (http://gnomad.broadinstitute.org), indicating this variant is rare. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.59
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.050
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.46	T;T
Eigen	Uncertain	0.20
Eigen_PC	Uncertain	0.36
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Benign	0.76	T;T
M_CAP	Benign	0.019	T
MetaRNN	Benign	0.42	T;T
MetaSVM	Benign	-0.61	T
MutationAssessor	Benign	0.55	N;.
PrimateAI	Uncertain	0.61	T
PROVEAN	Benign	-1.5	N;.
REVEL	Uncertain	0.29
Sift	Benign	0.27	T;.
Sift4G	Benign	0.60	T;T
Polyphen		0.077	B;.
Vest4		0.59
MutPred		0.19		Loss of glycosylation at T2187 (P = 0.0081);.;
MVP		0.84
MPC		0.40
ClinPred		0.71	D
GERP RS		5.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.071
gMVP		0.31

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-54891728;