2-54664672-A-T

Variant names:

• chr2-54664672-A-T
• NM_003128.3:c.6640A>T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_003128.3(SPTBN1):​c.6640A>T​(p.Asn2214Tyr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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: 9.27

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 3 ACMG points.

• 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.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SPTBN1	NM_003128.3	c.6640A>T	p.Asn2214Tyr	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.6640A>T	p.Asn2214Tyr	missense_variant	Exon 33 of 36	1	NM_003128.3	ENSP00000349259.4
SPTBN1	ENST00000615901.4	c.6646A>T	p.Asn2216Tyr	missense_variant	Exon 35 of 38	5
SPTBN1	ENST00000467371.1	n.1772A>T		non_coding_transcript_exon_variant	Exon 1 of 4	2
SPTBN1-AS2	ENST00000626206.1	n.392T>A		non_coding_transcript_exon_variant	Exon 2 of 4	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

Inborn genetic diseases Uncertain:1

Nov 13, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.6640A>T (p.N2214Y) alteration is located in exon 33 (coding exon 32) of the SPTBN1 gene. This alteration results from a A to T substitution at nucleotide position 6640, causing the asparagine (N) at amino acid position 2214 to be replaced by a tyrosine (Y). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.28
BayesDel_addAF	Benign	-0.0094	T
BayesDel_noAF	Benign	-0.25
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.86	D;T
Eigen	Pathogenic	0.78
Eigen_PC	Pathogenic	0.80
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.96	D;D
M_CAP	Benign	0.042	D
MetaRNN	Uncertain	0.45	T;T
MetaSVM	Benign	-0.84	T
MutationAssessor	Uncertain	2.7	M;.
PrimateAI	Uncertain	0.75	T
PROVEAN	Uncertain	-2.8	D;.
REVEL	Benign	0.27
Sift	Uncertain	0.019	D;.
Sift4G	Uncertain	0.017	D;D
Polyphen		0.97	D;.
Vest4		0.58
MutPred		0.46		Gain of phosphorylation at N2214 (P = 0.0467);.;
MVP		0.57
MPC		1.1
ClinPred		0.97	D
GERP RS		5.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.34
gMVP		0.24

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: chr2-54891809; COSMIC: COSV61690490; COSMIC: COSV61690490;