chr11-5225502-A-G

Position:

• chr11-5225502-A-G

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_Strong BP6 BS2_Supporting

The NM_000518.5(HBB):​c.*96T>C variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00385 in 1,123,116 control chromosomes in the GnomAD database, including 18 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.0027 (2 hom., cov: 33)
  • Exomes 𝑓: 0.0040 (16 hom.)
• Consequence: HBB NM_000518.5 3_prime_UTR
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:7
• Conservation: PhyloP100: 1.92

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]

ENSG00000285498 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -6 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.76).
• BP6: Variant 11-5225502-A-G is Benign according to our data. Variant chr11-5225502-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 36331.We mark this variant Likely_benign, oryginal submissions are: {Benign=2, Likely_benign=4, Uncertain_significance=1}. Variant chr11-5225502-A-G is described in Lovd as [Benign].
• BS2: High Homozygotes in GnomAd4 at 2 SD geneVariant has number of homozygotes lower than other variant known as pathogenic in the gene, so the strength is limited to Supporting.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
HBB	NM_000518.5	c.*96T>C		3_prime_UTR_variant	3/3	ENST00000335295.4	NP_000509.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
HBB	ENST00000335295	c.*96T>C		3_prime_UTR_variant	3/3	1	NM_000518.5	ENSP00000333994.3

Frequencies

GnomAD3 genomes AF: 0.00267 AC: 407 AN: 152224 Hom.: 2 Cov.: 33

Gnomad AFR AF: 0.000989

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000916

Gnomad ASJ AF: 0.000576

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00132

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.00488

Gnomad OTH AF: 0.00144

GnomAD4 exome AF: 0.00403 AC: 3913 AN: 970774 Hom.: 16 Cov.: 13 AF XY: 0.00404 AC XY: 2038 AN XY: 504534

Gnomad4 AFR exome AF: 0.000623

Gnomad4 AMR exome AF: 0.000886

Gnomad4 ASJ exome AF: 0.000303

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000262

Gnomad4 FIN exome AF: 0.00208

Gnomad4 NFE exome AF: 0.00544

Gnomad4 OTH exome AF: 0.00282

GnomAD4 genome AF: 0.00267 AC: 407 AN: 152342 Hom.: 2 Cov.: 33 AF XY: 0.00231 AC XY: 172 AN XY: 74512

Gnomad4 AFR AF: 0.000986

Gnomad4 AMR AF: 0.000914

Gnomad4 ASJ AF: 0.000576

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00132

Gnomad4 NFE AF: 0.00488

Gnomad4 OTH AF: 0.00142

Alfa AF: 0.00374 Hom.: 0

Bravo AF: 0.00233

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:7

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Benign:4

Likely benign, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Jun 10, 2022	- -
Benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Nov 24, 2023	- -
Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 31, 2024	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Apr 04, 2019	See Variant Classification Assertion Criteria. -

beta Thalassemia Uncertain:1 Benign:2

Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Apr 27, 2017	This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -
Likely benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Aug 18, 2011	- -
Benign, criteria provided, single submitter	clinical testing	Mendelics	May 28, 2019	- -

HBB-related disorder Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Feb 28, 2020

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.76
CADD	Benign	14
DANN	Benign	0.89

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: rs34029390; hg19: chr11-5246732;