rs33959855
Variant summary
Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1PM2PP5_Moderate
The NM_000518.5(HBB):c.67G>T(p.Glu23Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,554 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★).
Frequency
Genomes: not found (cov: 32)
Exomes 𝑓: 6.8e-7 ( 0 hom. )
Consequence
HBB
NM_000518.5 stop_gained
NM_000518.5 stop_gained
Scores
1
2
4
Clinical Significance
Conservation
PhyloP100: 2.21
Genes affected
HBB (HGNC:4827): (hemoglobin subunit beta) The alpha (HBA) and beta (HBB) loci determine the structure of the 2 types of polypeptide chains in adult hemoglobin, Hb A. The normal adult hemoglobin tetramer consists of two alpha chains and two beta chains. Mutant beta globin causes sickle cell anemia. Absence of beta chain causes beta-zero-thalassemia. Reduced amounts of detectable beta globin causes beta-plus-thalassemia. The order of the genes in the beta-globin cluster is 5'-epsilon -- gamma-G -- gamma-A -- delta -- beta--3'. [provided by RefSeq, Jul 2008]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 12 ACMG points.
PVS1
?
Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 325 pathogenic variants in the truncated region.
PM2
?
Very rare variant in population databases, with high coverage;
PP5
?
Variant 11-5226955-C-A is Pathogenic according to our data. Variant chr11-5226955-C-A is described in ClinVar as [Pathogenic]. Clinvar id is 869359.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr11-5226955-C-A is described in Lovd as [Pathogenic].
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
HBB | NM_000518.5 | c.67G>T | p.Glu23Ter | stop_gained | 1/3 | ENST00000335295.4 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
HBB | ENST00000335295.4 | c.67G>T | p.Glu23Ter | stop_gained | 1/3 | 1 | NM_000518.5 | P1 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD3 genomes
?
Cov.:
32
GnomAD4 exome AF: 6.84e-7 AC: 1AN: 1461554Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0AN XY: 727112
GnomAD4 exome
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1
AN:
1461554
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33
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0
AN XY:
727112
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GnomAD4 genome ? Cov.: 32
GnomAD4 genome
?
Cov.:
32
ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:2
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
beta Thalassemia Pathogenic:1
Pathogenic, no assertion criteria provided | curation | The ITHANET community portal, The Cyprus Institute of Neurology and Genetics | Nov 25, 2019 | - - |
not provided Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Dec 10, 2020 | This variant has been observed in individual(s) with beta-thalassemias (PMID: 1301930, 27756326). This variant is also known as a codon 22 nonsense mutation (GAA-TAA) or codon 22 G>T. ClinVar contains an entry for this variant (Variation ID: 869359). This variant is not present in population databases (ExAC no frequency). This sequence change creates a premature translational stop signal (p.Glu23*) in the HBB gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in HBB are known to be pathogenic (PMID: 23637309). For these reasons, this variant has been classified as Pathogenic. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Uncertain
CADD
Pathogenic
DANN
Uncertain
Eigen
Benign
Eigen_PC
Benign
FATHMM_MKL
Benign
D
MutationTaster
Benign
A
Vest4
GERP RS
Splicing
Name
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Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
DS_DG_spliceai
Position offset: 13
Find out detailed SpliceAI scores and Pangolin per-transcript scores at