14-64767829-G-T

Variant names:

• chr14-64767829-G-T
• rs121918647
• NM_001355436.2:c.6053C>A

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PM1 PM2 PM5 PP3_Moderate

The NM_001355436.2(SPTB):​c.6053C>A​(p.Ala2018Asp) 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 pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A2018G) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SPTB NM_001355436.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.96
• Publications: 0 publications found

Genes affected

SPTB (HGNC:11274): (spectrin beta, erythrocytic) This locus encodes a member of the spectrin gene family. Spectrin proteins, along with ankyrin, play a role in cell membrane organization and stability. The protein encoded by this locus functions in stability of erythrocyte membranes, and mutations in this gene have been associated with spherocytosis type 2, hereditary elliptocytosis, and neonatal hemolytic anemia. Alternatively spliced transcript variants have been described. [provided by RefSeq, Nov 2009]

SPTB Gene-Disease associations (from GenCC):

• hereditary spherocytosis type 2

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• elliptocytosis 3

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• hereditary elliptocytosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• hereditary spherocytosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 4 uncertain in NM_001355436.2
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr14-64767829-G-C is described in ClinVar as Pathogenic. ClinVar VariationId is 12836.Status of the report is no_assertion_criteria_provided, 0 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.867

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SPTB	NM_001355436.2	c.6053C>A	p.Ala2018Asp	missense_variant	Exon 30 of 36	ENST00000644917.1	NP_001342365.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SPTB	ENST00000644917.1	c.6053C>A	p.Ala2018Asp	missense_variant	Exon 30 of 36		NM_001355436.2	ENSP00000495909.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

May 21, 2021

Mayo Clinic Laboratories, Mayo Clinic

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.37	D
BayesDel_noAF	Pathogenic	0.30
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.0	.;.;.;T;D;D
Eigen	Pathogenic	0.91
Eigen_PC	Pathogenic	0.85
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.0	.;.;D;D;.;D
M_CAP	Benign	0.067	D
MetaRNN	Pathogenic	0.87	D;D;D;D;D;D
MetaSVM	Uncertain	0.016	D
MutationAssessor	Pathogenic	3.7	H;H;H;.;H;H
PhyloP100		10
PrimateAI	Uncertain	0.69	T
PROVEAN	Pathogenic	-5.5	D;.;D;D;D;D
REVEL	Pathogenic	0.68
Sift	Uncertain	0.0010	D;.;D;D;D;D
Sift4G	Pathogenic	0.0	D;.;D;D;D;D
Vest4		0.92
ClinPred		1.0	D
GERP RS		5.1
RBP_binding_hub_radar		1.1
RBP_regulation_power_radar		2.8
Varity_R		0.99
gMVP		0.86
Mutation Taster		=1/99	disease causing

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: rs121918647; hg19: chr14-65234547;