rs33987957

Positions:

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1PM2PM5PP3

The ENST00000335295.4(HBB):c.365A>T(p.Glu122Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,812 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 Uncertain significance (★). Another nucleotide change resulting in same amino acid change has been previously reported as Likely benignin UniProt. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E122A) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

HBB
ENST00000335295.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1O:2

Conservation

PhyloP100: 2.15

Variant links:

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]

HBB links:

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ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

PM1

In a hotspot region, there are 6 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 4 benign, 15 uncertain in ENST00000335295.4

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr11-5225678-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 15292.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.777

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
HBB	NM_000518.5 linkuse as main transcript	c.365A>T	p.Glu122Val	missense_variant	3/3	ENST00000335295.4	NP_000509.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris
HBB	ENST00000335295.4 linkuse as main transcript	c.365A>T	p.Glu122Val	missense_variant	3/3	1	NM_000518.5	ENSP00000333994	P1
HBB	ENST00000647020.1 linkuse as main transcript	c.365A>T	p.Glu122Val	missense_variant	3/3			ENSP00000494175	P1
HBB	ENST00000475226.1 linkuse as main transcript	n.297A>T		non_coding_transcript_exon_variant	2/2	2
HBB	ENST00000633227.1 linkuse as main transcript	c.*181A>T		3_prime_UTR_variant, NMD_transcript_variant	3/3	3		ENSP00000488004

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251312

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135812

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000880

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461812

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727216

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

8.99e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.00000378

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1Other:2

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Apr 02, 2024

Variant summary: HBB c.365A>T (p.Glu122Val), also known as Hb Beograd, results in a non-conservative amino acid change located in the Globin domain (IPR000971) of the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. Other Hemoglobin variants have been reported at this codon. The variant allele was found at a frequency of 4e-06 in 251312 control chromosomes. c.365A>T has been reported in the literature as interacting with beta-thalassemic genotypes and resulting in a severe presentation in setting of beta-0 thalassemia in at-least report (example, Aksoy_1984, Ruvidi_1975). Another study reorts its presence in members of a Serbian family where it is reported as not changing the functional and physical properties of the hemoglobin molecule (Efremov_1973). These data indicate that the variant may be associated with disease. The following publications have been ascertained in the context of this evaluation (PMID: 6480364, 4761994, 17365000, 809962). ClinVar contains an entry for this variant (Variation ID: 15110). Based on the evidence outlined above, the variant was classified as VUS-possibly pathogenic. -

HEMOGLOBIN D (CAMPERDOWN)

Other:1

other, no assertion criteria provided

literature only

OMIM

Dec 12, 2017

- -

HEMOGLOBIN BEOGRAD

Other:1

other, no assertion criteria provided

literature only

OMIM

Dec 12, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.24

BayesDel_addAF

Pathogenic

0.42

BayesDel_noAF

Pathogenic

0.36

CADD

Benign

DANN

Benign

0.95

DEOGEN2

Benign

0.13

T;T

Eigen

Benign

-0.32

Eigen_PC

Benign

-0.39

FATHMM_MKL

Benign

0.73

LIST_S2

Uncertain

0.97

.;D

M_CAP

Pathogenic

0.34

MetaRNN

Pathogenic

0.78

D;D

MetaSVM

Uncertain

0.24

MutationAssessor

Pathogenic

3.3

M;M

MutationTaster

Benign

1.0

PrimateAI

Benign

0.37

PROVEAN

Uncertain

-4.3

D;.

REVEL

Uncertain

0.58

Sift

Pathogenic

0.0

D;.

Sift4G

Benign

0.10

T;.

Polyphen

0.50

P;P

Vest4

0.81

MutPred

0.65

Loss of disorder (P = 0.0205);Loss of disorder (P = 0.0205);

MVP

0.98

MPC

0.044

ClinPred

0.73

GERP RS

3.5

Varity_R

0.55

gMVP

0.81

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over