chr16-177088-C-A

Position:

chr16-177088-C-A

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 8P and 2B. PM1PM2PP3_StrongBP6_Moderate

The NM_000558.5(HBA1):c.255C>A(p.Ser85Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000129 in 1,546,446 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 Likely benign (★). Another nucleotide change resulting in same amino acid change has been previously reported as Uncertain significancein ClinVar.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 31)

Exomes 𝑓: 7.2e-7 ( 0 hom. )

Consequence

HBA1
NM_000558.5 missense

Scores

Clinical Significance

Likely benign criteria provided, single submitter B:1

Conservation

PhyloP100: -0.969

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 Likely_pathogenic. Variant got 6 ACMG points.

PM1

In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 3 benign, 15 uncertain in NM_000558.5

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.951

BP6

Variant 16-177088-C-A is Benign according to our data. Variant chr16-177088-C-A is described in ClinVar as [Likely_benign]. Clinvar id is 1679446.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HBA1	NM_000558.5 linkuse as main transcript	c.255C>A	p.Ser85Arg	missense_variant	2/3	ENST00000320868.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris
HBA1	ENST00000320868.9 linkuse as main transcript	c.255C>A	p.Ser85Arg	missense_variant	2/3	1	NM_000558.5	P1
HBA1	ENST00000472694.1 linkuse as main transcript	n.391C>A		non_coding_transcript_exon_variant	1/2	1
HBA1	ENST00000487791.1 linkuse as main transcript	n.224C>A		non_coding_transcript_exon_variant	2/2	1
HBA1	ENST00000397797.1 linkuse as main transcript	c.159C>A	p.Ser53Arg	missense_variant	2/3	2

Frequencies

GnomAD3 genomes

AF:

0.00000663

AC:

AN:

150750

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:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000149

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

7.16e-7

AC:

AN:

1395696

Hom.:

Cov.:

AF XY:

0.00000144

AC XY:

AN XY:

692090

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:

0.00

Gnomad4 OTH exome

AF:

0.0000172

GnomAD4 genome

AF:

0.00000663

AC:

AN:

150750

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

73486

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:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000149

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000378

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Dec 23, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.99

BayesDel_addAF

Pathogenic

0.22

BayesDel_noAF

Uncertain

0.080

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.37

T;.

Eigen

Benign

-0.85

Eigen_PC

Benign

-1.0

FATHMM_MKL

Benign

0.74

LIST_S2

Uncertain

0.88

D;D

M_CAP

Pathogenic

0.76

MetaRNN

Pathogenic

0.95

D;D

MetaSVM

Uncertain

0.25

MutationTaster

Benign

1.0

D;D

PrimateAI

Uncertain

0.75

PROVEAN

Pathogenic

-4.6

D;D

REVEL

Pathogenic

0.72

Sift

Pathogenic

0.0

D;D

Sift4G

Uncertain

0.028

D;D

Vest4

0.59

MutPred

0.83

Gain of methylation at S85 (P = 0.0495);.;

MVP

0.99

ClinPred

1.0

GERP RS

-7.2

Varity_R

0.98

gMVP

0.99

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