rs33966761

chr11-5225638-A-Cchr11-5225638-A-Gchr11-5225638-A-T

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PM5 PP3_Moderate

The NM_000518.5(HBB):c.404T>G(p.Val135Gly) 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 1,461,806 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V135A) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: HBB NM_000518.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.42

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 Likely_pathogenic. Variant got 8 ACMG points.

• PM1: In a hotspot region, there are 6 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 5 benign, 17 uncertain in NM_000518.5
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr11-5225638-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 15588.We mark this variant Likely_pathogenic, oryginal submissions are: {Pathogenic=1, Uncertain_significance=2}.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.879

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HBB	NM_000518.5	c.404T>G	p.Val135Gly	missense_variant	3/3	ENST00000335295.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HBB	ENST00000335295.4	c.404T>G	p.Val135Gly	missense_variant	3/3	1	NM_000518.5	P1
HBB	ENST00000647020.1	c.404T>G	p.Val135Gly	missense_variant	3/3			P1
HBB	ENST00000633227.1	c.*220T>G		3_prime_UTR_variant, NMD_transcript_variant	3/3	3
HBB	ENST00000475226.1			downstream_gene_variant		2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461806 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727228

Gnomad4 AFR exome AF: 0.0000299

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.60
BayesDel_addAF	Pathogenic	0.31	D
BayesDel_noAF	Pathogenic	0.20
Cadd	Benign	22
Dann	Uncertain	0.99
DEOGEN2	Benign	0.17	T;T
Eigen	Uncertain	0.30
Eigen_PC	Benign	0.16
FATHMM_MKL	Uncertain	0.90	D
M_CAP	Pathogenic	0.57	D
MetaRNN	Pathogenic	0.88	D;D
MetaSVM	Uncertain	0.55	D
MutationAssessor	Pathogenic	3.9	H;H
MutationTaster	Benign	1.0	D
PrimateAI	Benign	0.41	T
PROVEAN	Uncertain	-4.4	D;.
REVEL	Pathogenic	0.76
Sift	Pathogenic	0.0	D;.
Sift4G	Uncertain	0.0040	D;.
Polyphen		0.98	D;D
Vest4		0.55
MutPred		0.67		Loss of stability (P = 0.0119);Loss of stability (P = 0.0119);
MVP		0.87
MPC		0.21
ClinPred		1.0	D
GERP RS		1.1
Varity_R		0.73
gMVP		0.97

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: rs33966761; hg19: chr11-5246868;