rs33930702

Positions:

• chr11-5227019-C-A
• chr11-5227019-C-G
• chr11-5227019-C-T

Variant summary

Our verdict is Pathogenic. Variant got 13 ACMG points: 13P and 0B. PVS1 PS1_Moderate PM2 PP5

The NM_000518.5(HBB):​c.3G>T​(p.Met1?) variant causes a start lost change. 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 Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 33)
• Consequence: HBB NM_000518.5 start_lost
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 6.72

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]

ACMG classification

Verdict is Pathogenic. Variant got 13 ACMG points.

• PVS1: Start lost variant, no new inframe start found.
• PS1: Another start lost variant in NM_000518.5 (HBB) was described as [Pathogenic] in ClinVar as 869315
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 11-5227019-C-A is Pathogenic according to our data. Variant chr11-5227019-C-A is described in ClinVar as [Pathogenic]. Clinvar id is 869316.Status of the report is no_assertion_criteria_provided, 0 stars. Variant chr11-5227019-C-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HBB	NM_000518.5	c.3G>T	p.Met1?	start_lost	1/3	ENST00000335295.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HBB	ENST00000335295.4	c.3G>T	p.Met1?	start_lost	1/3	1	NM_000518.5	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 26

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

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

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.60	D
BayesDel_noAF	Pathogenic	0.36
CADD	Benign	23
DANN	Uncertain	0.99
DEOGEN2	Benign	0.036	T;T;.;T
Eigen	Uncertain	0.53
Eigen_PC	Uncertain	0.52
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.90	.;D;D;D
M_CAP	Pathogenic	0.93	D
MetaRNN	Pathogenic	0.89	D;D;D;D
MetaSVM	Uncertain	0.61	D
MutationTaster	Benign	1.0	D
PROVEAN	Benign	-2.1	N;.;.;N
REVEL	Pathogenic	0.78
Sift	Uncertain	0.0020	D;.;.;D
Sift4G	Uncertain	0.020	D;.;.;.
Polyphen		0.97	D;D;.;.
Vest4		0.99
MutPred		0.62		Gain of catalytic residue at M1 (P = 0.0305);Gain of catalytic residue at M1 (P = 0.0305);Gain of catalytic residue at M1 (P = 0.0305);Gain of catalytic residue at M1 (P = 0.0305);
MVP		0.78
ClinPred		0.93	D
GERP RS		5.2
Varity_R		0.72
gMVP		0.71

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

LitVar

Other links and lift over

dbSNP: rs33930702; hg19: chr11-5248249;