rs1455019991

Positions:

• chr16-173043-C-T

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BP6_Very_Strong

The NM_000517.6(HBA2):​c.95+36C>T variant causes a intron 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 Likely benign (★★).

• Frequency:
  • Genomes: not found (cov: 4)
  • Exomes 𝑓: 0.000021 (2 hom.)
  • Failed GnomAD Quality Control
• Consequence: HBA2 NM_000517.6 intron
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: -0.229

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]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.88).
• BP6: Variant 16-173043-C-T is Benign according to our data. Variant chr16-173043-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 439127.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HBA2	NM_000517.6	c.95+36C>T		intron_variant		ENST00000251595.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HBA2	ENST00000251595.11	c.95+36C>T		intron_variant		1	NM_000517.6	P1
HBA2	ENST00000484216.1	c.64+36C>T		intron_variant		1
HBA2	ENST00000482565.1	n.150C>T		non_coding_transcript_exon_variant	1/2	1
HBA2	ENST00000397806.1	c.-1-82C>T		intron_variant		2

Frequencies

GnomAD3 genomes Cov.: 4

GnomAD3 exomes AF: 0.0000956 AC: 6 AN: 62738 Hom.: 1 AF XY: 0.0000941 AC XY: 3 AN XY: 31878

Gnomad AFR exome AF: 0.000394

Gnomad AMR exome AF: 0.000143

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000244

Gnomad SAS exome AF: 0.00

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: 0.0000215 AC: 10 AN: 465472 Hom.: 2 Cov.: 3 AF XY: 0.0000203 AC XY: 5 AN XY: 245790

Gnomad4 AFR exome AF: 0.000415

Gnomad4 AMR exome AF: 0.0000784

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000967

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 4

ClinVar

Significance: Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Mar 08, 2017	- -
Likely benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Dec 23, 2016	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.88
CADD	Benign	7.2
DANN	Benign	0.64

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: rs1455019991; hg19: chr16-223042;