chr14-64767686-C-CAA

Position:

• chr14-64767686-C-CAA

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_001355436.2(SPTB):​c.6195_6196insTT​(p.Ala2066LeufsTer12) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SPTB NM_001355436.2 frameshift
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: -1.14

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]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 14-64767686-C-CAA is Pathogenic according to our data. Variant chr14-64767686-C-CAA is described in ClinVar as [Likely_pathogenic]. Clinvar id is 523132.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SPTB	NM_001355436.2	c.6195_6196insTT	p.Ala2066LeufsTer12	frameshift_variant	30/36	ENST00000644917.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SPTB	ENST00000644917.1	c.6195_6196insTT	p.Ala2066LeufsTer12	frameshift_variant	30/36		NM_001355436.2	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary spherocytosis Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

MVZ Dr. Eberhard & Partner Dortmund

Mar 20, 2018

Frameshift mutation that generates a premature stop at exon 30 which results in a modified, c-terminal self assoscation site, p.(Ala2066Leufs*12). -

Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1555366592; hg19: chr14-65234404;