11-5226683-C-T

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM2PM5BP4_Moderate

The NM_000518.5(HBB):c.209G>A(p.Gly70Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000124 in 1,613,954 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely benign in UniProt. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G70R) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

HBB
NM_000518.5 missense

Scores

Clinical Significance

Likely benign criteria provided, single submitter P:1B:1

Conservation

PhyloP100: -1.25

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr11-5226684-C-T is described in Lovd as [Pathogenic].

BP4

Computational evidence support a benign effect (MetaRNN=0.20877975).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HBB	NM_000518.5 link	c.209G>A	p.Gly70Asp	missense_variant	Exon 2 of 3	ENST00000335295.4	NP_000509.1	P68871D9YZU5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HBB	ENST00000335295.4 link	c.209G>A	p.Gly70Asp	missense_variant	Exon 2 of 3	1	NM_000518.5	ENSP00000333994.3		P68871

Frequencies

GnomAD3 genomes

AF:

0.00000658

AC:

AN:

152080

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251428

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135882

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:

0.00000879

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461874

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727244

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

AF:

0.00000658

AC:

AN:

152080

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74296

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000655

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Likely benign

Submissions summary: Pathogenic:1Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Pathogenic:1

May 01, 2000

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

not provided

Benign:1

Oct 23, 2024

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The Hb Rambam variant (HBB: c.209G>A; p.Gly70Asp, also known as Gly69Asp when numbered from the mature protein, HbVar ID: 376, rs34718174) has been reported heterozygously in multiple individuals with no associated clinical symptoms (Bisse 1998, HbVar database and references therein). It has also been found in-trans with a pathogenic HBB variant in individuals, but did not contribute to their clinical symptoms (Plaseska-Karanfilska 2000). The variant is listed in ClinVar (Variation ID: 15226), and is observed once in the Genome Aggregation Database general population database (1/251428 alleles). The glycine at residue 70 is weakly conserved, but computational analyses are uncertain whether this variant is neutral or deleterious (REVEL:0.564). Based on the above information, the variant is considered likely benign. References: Link to HbVar database: https://globin.bx.psu.edu/hbvar/menu.html Bissé E et al. Hemoglobin Rambam (beta69(E13)Gly-->Asp), a pitfall in the assessment of diabetic control: characterization by electrospray mass spectrometry and HPLC. Clin Chem. 1998 Oct;44(10):2172-7. PMID: 9761252. Plaseska-Karanfilska D, de Weinstein BI, Efremov GD. Hb Rambam (beta69(E13)Gly-->Asp)/beta0-thalassemia (codon 5 (-CT)) in a family from Argentina. Hemoglobin. 2000 May;24(2):157-61. PMID: 10870889. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.32

BayesDel_addAF

Uncertain

0.13

BayesDel_noAF

Uncertain

-0.050

CADD

Benign

5.3

DANN

Benign

0.56

DEOGEN2

Benign

0.021

T;T;.;T

Eigen

Benign

-1.4

Eigen_PC

Benign

-1.5

FATHMM_MKL

Benign

0.029

LIST_S2

Benign

0.69

.;T;T;T

M_CAP

Uncertain

0.14

MetaRNN

Benign

0.21

T;T;T;T

MetaSVM

Benign

-0.54

MutationAssessor

Benign

-0.41

N;N;.;.

PrimateAI

Benign

0.36

PROVEAN

Benign

0.92

N;.;.;N

REVEL

Uncertain

0.56

Sift

Benign

0.88

T;.;.;T

Sift4G

Benign

0.66

T;.;.;.

Polyphen

0.0

B;B;.;.

Vest4

0.55

MutPred

0.21

Loss of catalytic residue at A71 (P = 0.0859);Loss of catalytic residue at A71 (P = 0.0859);Loss of catalytic residue at A71 (P = 0.0859);Loss of catalytic residue at A71 (P = 0.0859);

MVP

0.63

MPC

0.039

ClinPred

0.033

GERP RS

-10

Varity_R

0.092

gMVP

0.76

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

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