rs111033601

chr16-173236-C-Achr16-173236-C-Gchr16-173236-C-N

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_000517.6(HBA2):c.207C>A(p.Asn69Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000144 in 1,385,422 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 10/17 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another nucleotide change resulting in same amino acid change has been previously reported as Likely benignin ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N69?) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000077 ( 0 hom., cov: 21)

Exomes 𝑓: 8.0e-7 ( 0 hom. )

Consequence

HBA2
NM_000517.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -8.51

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.935

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HBA2	NM_000517.6 linkuse as main transcript	c.207C>A	p.Asn69Lys	missense_variant	2/3	ENST00000251595.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris
HBA2	ENST00000251595.11 linkuse as main transcript	c.207C>A	p.Asn69Lys	missense_variant	2/3	1	NM_000517.6	P1
HBA2	ENST00000484216.1 linkuse as main transcript	c.177C>A	p.Asn59Lys	missense_variant	2/2	1
HBA2	ENST00000482565.1 linkuse as main transcript	n.343C>A		non_coding_transcript_exon_variant	1/2	1
HBA2	ENST00000397806.1 linkuse as main transcript	c.111C>A	p.Asn37Lys	missense_variant	2/3	2

Frequencies

GnomAD3 genomes

AF:

0.00000773

AC:

AN:

129334

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000364

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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

GnomAD4 exome

AF:

7.96e-7

AC:

AN:

1256088

Hom.:

Cov.:

AF XY:

0.00000160

AC XY:

AN XY:

625918

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:

0.00000103

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000773

AC:

AN:

129334

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

62406

show subpopulations

Gnomad4 AFR

AF:

0.0000364

Gnomad4 AMR

AF:

0.00

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

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Quest Diagnostics Nichols Institute San Juan Capistrano

Nov 04, 2019

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Benign

-0.010

BayesDel_noAF

Benign

-0.25

Cadd

Benign

0.025

Dann

Benign

0.78

Eigen

Benign

-1.9

Eigen_PC

Benign

-2.0

FATHMM_MKL

Benign

0.035

M_CAP

Uncertain

0.14

MetaRNN

Pathogenic

0.93

D;D

MetaSVM

Benign

-0.44

MutationTaster

Benign

1.0

N;N

PrimateAI

Benign

0.45

PROVEAN

Benign

-0.89

N;N

REVEL

Uncertain

0.38

Sift

Benign

1.0

T;T

Sift4G

Benign

0.56

T;T

Vest4

0.66

MutPred

0.95

Gain of ubiquitination at N69 (P = 0.0211);.;

MVP

0.96

MPC

1.4

ClinPred

0.080

GERP RS

-8.4

gMVP

0.77

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