rs33970907

chr11-5249737-T-Achr11-5249737-T-C

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_000559.3(HBG1):c.68A>T(p.Asp23Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. In-silico tool predicts a benign outcome for this variant. 12/19 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D23G) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 4)
• Consequence: HBG1 NM_000559.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.13

Genes affected

HBG1 (HGNC:4831): (hemoglobin subunit gamma 1) The gamma globin genes (HBG1 and HBG2) are normally expressed in the fetal liver, spleen and bone marrow. Two gamma chains together with two alpha chains constitute fetal hemoglobin (HbF) which is normally replaced by adult hemoglobin (HbA) at birth. In some beta-thalassemias and related conditions, gamma chain production continues into adulthood. The two types of gamma chains differ at residue 136 where glycine is found in the G-gamma product (HBG2) and alanine is found in the A-gamma product (HBG1). The former is predominant at birth. The order of the genes in the beta-globin cluster is: 5'-epsilon -- gamma-G -- gamma-A -- delta -- beta--3'. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.16292828).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HBG1	NM_000559.3	c.68A>T	p.Asp23Val	missense_variant	1/3	ENST00000330597.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HBG1	ENST00000330597.5	c.68A>T	p.Asp23Val	missense_variant	1/3	1	NM_000559.3	P1
HBG1	ENST00000632727.1	c.54+14A>T		intron_variant		3
HBG1	ENST00000648735.1	n.119A>T		non_coding_transcript_exon_variant	1/2

Frequencies

GnomAD3 genomes Cov.: 4

GnomAD4 exome Cov.: 0

GnomAD4 genome Cov.: 4

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.061
BayesDel_addAF	Uncertain	0.027	T
BayesDel_noAF	Benign	-0.20
Cadd	Benign	14
Dann	Benign	0.91
Eigen	Benign	-0.97
Eigen_PC	Benign	-1.0
FATHMM_MKL	Benign	0.18	N
LIST_S2	Benign	0.77	T
M_CAP	Benign	0.0068	T
MetaRNN	Benign	0.16	T
MetaSVM	Benign	-0.61	T
MutationTaster	Benign	1.0	N
PrimateAI	Uncertain	0.49	T
PROVEAN	Benign	-2.1	N
REVEL	Uncertain	0.43
Sift	Benign	0.047	D
Sift4G	Benign	0.13	T
Polyphen		0.0	B
Vest4		0.24
MutPred		0.64		Loss of disorder (P = 0.0349);
MVP		0.75
MPC		1.6
ClinPred		0.082	T
GERP RS		-0.13
gMVP		0.48

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs33970907; hg19: chr11-5270967;