NM_000518.5:c.*112A>G

Variant names:

• chr11-5225486-T-C
• rs63750954
• ENST00000335295:c.*112A>G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM2 PP5_Moderate BP4

The NM_000518.5(HBB):​c.*112A>G variant causes a 3 prime UTR change. The variant allele was found at a frequency of 0.00000116 in 859,910 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000012 (0 hom.)
• Consequence: HBB NM_000518.5 3_prime_UTR
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 3.64

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 Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 11-5225486-T-C is Pathogenic according to our data. Variant chr11-5225486-T-C is described in ClinVar as [Pathogenic]. Clinvar id is 15476.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr11-5225486-T-C is described in Lovd as [Pathogenic].
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.38). . Strength limited to SUPPORTING due to the PP5.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HBB	NM_000518.5	c.*112A>G		3_prime_UTR_variant	Exon 3 of 3	ENST00000335295.4	NP_000509.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HBB	ENST00000335295	c.*112A>G		3_prime_UTR_variant	Exon 3 of 3	1	NM_000518.5	ENSP00000333994.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000116 AC: 1 AN: 859910 Hom.: 0 Cov.: 12 AF XY: 0.00000221 AC XY: 1 AN XY: 451864

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: 0.00

Gnomad4 OTH exome AF: 0.0000248

GnomAD4 genome Cov.: 33

Asia WGS AF: 0.000866 AC: 3 AN: 3478

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

beta Thalassemia Pathogenic:1

Nov 13, 2024

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

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: HBB c.*112A>G is located in the untranslated mRNA region downstream of the termination codon. The variant was absent in 31396 control chromosomes (gnomAD). c.*112A>G has been reported in the literature in multiple individuals affected with Beta Thalassemia (e.g. Jankovic_1990, Huisman_1997, Phylipsen_2010, Rahim_2015, Lim_2016). These data indicate that the variant is very likely to be associated with disease. The following publications have been ascertained in the context of this evaluation (PMID: 2375910, 9342003, 1856830, 27821013, 26554253, 20110179). ClinVar contains an entry for this variant (Variation ID: 15476). Based on the evidence outlined above, the variant was classified as pathogenic. -

Beta-plus-thalassemia Pathogenic:1

Jul 20, 2016

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.38
CADD	Benign	19
DANN	Benign	0.84

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: rs63750954; hg19: chr11-5246716;