rs772829778

Variant names:

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBA1

The NM_000517.6(HBA2):c.-24C>G variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.0 ( 0 hom., cov: 0)

Exomes 𝑓: 0.082 ( 1242 hom. )

Failed GnomAD Quality Control

Consequence

HBA2
NM_000517.6 5_prime_UTR

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:6

Conservation

PhyloP100: -2.42

Publications

4 publications found

Variant links:

Genes affected

HBA2 (HGNC:4824): (hemoglobin subunit alpha 2) The human alpha globin gene cluster located on chromosome 16 spans about 30 kb and includes seven loci: 5'- zeta - pseudozeta - mu - pseudoalpha-1 - alpha-2 - alpha-1 - theta - 3'. The alpha-2 (HBA2) and alpha-1 (HBA1) coding sequences are identical. These genes differ slightly over the 5' untranslated regions and the introns, but they differ significantly over the 3' untranslated regions. Two alpha chains plus two beta chains constitute HbA, which in normal adult life comprises about 97% of the total hemoglobin; alpha chains combine with delta chains to constitute HbA-2, which with HbF (fetal hemoglobin) makes up the remaining 3% of adult hemoglobin. Alpha thalassemias result from deletions of each of the alpha genes as well as deletions of both HBA2 and HBA1; some nondeletion alpha thalassemias have also been reported. [provided by RefSeq, Jul 2008]

HBA2 Gene-Disease associations (from GenCC):

alpha thalassemia spectrum
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), ClinGen
erythrocytosis, familial, 7
Inheritance: AD Classification: STRONG, LIMITED Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
hemoglobin M disease
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Hb Bart's hydrops fetalis
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
hemoglobin H disease
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
Heinz body anemia
Inheritance: AD Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)
methemoglobinemia, alpha type
Inheritance: AD Classification: LIMITED Submitted by: ClinGen

HBA2 links:

ENSG00000294455 (HGNC:):

ENSG00000294455 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -20 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.89).

BP6

Variant 16-172889-C-G is Benign according to our data. Variant chr16-172889-C-G is described in ClinVar as Benign. ClinVar VariationId is 439113.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BA1

GnomAdExome4 highest subpopulation (MID) allele frequency at 95% confidence interval = 0.102 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HBA2	NM_000517.6 link	c.-24C>G		5_prime_UTR_variant	Exon 1 of 3	ENST00000251595.11	NP_000508.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HBA2	ENST00000251595.11 link	c.-24C>G		5_prime_UTR_variant	Exon 1 of 3	1	NM_000517.6	ENSP00000251595.6

Frequencies

GnomAD3 genomes

AF:

0.00

AC:

AN:

Hom.:

Cov.:

Gnomad AMR

AF:

0.00

Gnomad NFE

AF:

0.00

GnomAD2 exomes

AF:

0.0687

AC:

3594

AN:

52298

AF XY:

0.0707

show subpopulations

Gnomad AFR exome

AF:

0.0148

Gnomad AMR exome

AF:

0.0618

Gnomad ASJ exome

AF:

0.150

Gnomad EAS exome

AF:

0.000387

Gnomad FIN exome

AF:

0.0696

Gnomad NFE exome

AF:

0.0968

Gnomad OTH exome

AF:

0.0995

GnomAD4 exome

AF:

0.0816

AC:

17551

AN:

215140

Hom.:

1242

Cov.:

AF XY:

0.0851

AC XY:

9799

AN XY:

115192

show subpopulations

African (AFR)

AF:

0.0187

AC:

100

AN:

5360

American (AMR)

AF:

0.0578

AC:

667

AN:

11548

Ashkenazi Jewish (ASJ)

AF:

0.136

AC:

731

AN:

5382

East Asian (EAS)

AF:

0.000407

AC:

AN:

9838

South Asian (SAS)

AF:

0.102

AC:

3980

AN:

39030

European-Finnish (FIN)

AF:

0.0513

AC:

512

AN:

9990

Middle Eastern (MID)

AF:

0.123

AC:

AN:

750

European-Non Finnish (NFE)

AF:

0.0866

AC:

10600

AN:

122352

Other (OTH)

AF:

0.0794

AC:

865

AN:

10890

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.527

Heterozygous variant carriers

829

1659

2488

3318

4147

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

136

204

272

340

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Data not reliable, filtered out with message: AC0;AS_VQSR

AF:

0.00

AC:

AN:

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

African (AFR)

AF:

0.00

AC:

AN:

American (AMR)

AF:

0.00

AC:

AN:

Ashkenazi Jewish (ASJ)

AC:

AN:

East Asian (EAS)

AC:

AN:

South Asian (SAS)

AC:

AN:

European-Finnish (FIN)

AC:

AN:

Middle Eastern (MID)

AC:

AN:

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

Other (OTH)

AC:

AN:

Alfa

AF:

0.0351

Hom.:

ClinVar

Significance: Benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:3

Apr 05, 2023

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Apr 21, 2020

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jul 09, 2018

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is associated with the following publications: (PMID: 31478238) -

alpha Thalassemia

Benign:2

Sep 16, 2020

Natera, Inc.

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Nov 25, 2019

The ITHANET community portal, The Cyprus Institute of Neurology and Genetics

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:curation

- -

not specified

Benign:1

Mar 04, 2025

Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.89

CADD

Benign

0.59

(source)

DANN

Benign

0.64

PhyloP100

-2.4

PromoterAI

0.26

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Mutation Taster

=300/0

polymorphism (auto)

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over