16-176780-G-C

Variant summary

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

The NM_000558.5(HBA1):c.64G>C(p.Ala22Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000668 in 149,608 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as other (no stars). Another nucleotide change resulting in same amino acid change has been previously reported as Likely benignin UniProt. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A22D) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000067 ( 0 hom., cov: 28)

Exomes 𝑓: 0.0000035 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

HBA1
NM_000558.5 missense

Scores

Clinical Significance

other no assertion criteria provided O:1

Conservation

PhyloP100: 0.806

Variant links:

Genes affected

HBA1 (HGNC:4823): (hemoglobin subunit alpha 1) 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]

HBA1 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, 0.871

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HBA1	NM_000558.5 linkuse as main transcript	c.64G>C	p.Ala22Pro	missense_variant	1/3	ENST00000320868.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris
HBA1	ENST00000320868.9 linkuse as main transcript	c.64G>C	p.Ala22Pro	missense_variant	1/3	1	NM_000558.5	P1
HBA1	ENST00000472694.1 linkuse as main transcript	n.83G>C		non_coding_transcript_exon_variant	1/2	1
HBA1	ENST00000487791.1 linkuse as main transcript	n.33G>C		non_coding_transcript_exon_variant	1/2	1
HBA1	ENST00000397797.1 linkuse as main transcript	c.-2+18G>C		intron_variant		2

Frequencies

GnomAD3 genomes

AF:

0.00000669

AC:

AN:

149528

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000211

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000122

AC:

AN:

163732

Hom.:

AF XY:

0.0000227

AC XY:

AN XY:

88070

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000847

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AS_VQSR

AF:

0.00000349

AC:

AN:

1432156

Hom.:

Cov.:

AF XY:

0.00000562

AC XY:

AN XY:

711292

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:

0.0000482

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

9.12e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000668

AC:

AN:

149608

Hom.:

Cov.:

AF XY:

0.0000137

AC XY:

AN XY:

72882

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000211

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

ExAC

AF:

0.00000866

AC:

ClinVar

Significance: other

Submissions summary: Other:1

Revision: no assertion criteria provided

LINK: link

Submissions by phenotype

HEMOGLOBIN FONTAINEBLEAU

Other:1

other, no assertion criteria provided

literature only

OMIM

Jul 20, 2016

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.25

BayesDel_addAF

Uncertain

0.12

BayesDel_noAF

Uncertain

0.12

Cadd

Benign

Dann

Uncertain

0.98

DEOGEN2

Benign

0.19

Eigen

Benign

-0.49

Eigen_PC

Benign

-0.65

FATHMM_MKL

Benign

0.57

LIST_S2

Benign

0.85

M_CAP

Pathogenic

0.47

MetaRNN

Pathogenic

0.87

MetaSVM

Uncertain

0.18

MutationTaster

Benign

1.0

N;N

PrimateAI

Benign

0.48

PROVEAN

Uncertain

-2.5

REVEL

Pathogenic

0.69

Sift

Uncertain

0.014

Sift4G

Uncertain

0.056

Vest4

0.37

MutPred

0.83

Gain of methylation at K17 (P = 0.0559);

MVP

1.0

ClinPred

0.12

GERP RS

1.2

Varity_R

0.72

gMVP

0.91

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

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