HBG2 p.Asp8Asn

Variant names:

• chr11-5254707-C-T
• rs34501593
• NM_000184.3:c.22G>A
• HBG2 p.Asp8Asn

Your query was ambiguous. Multiple possible variants found:

• chr11-5254707-C-T
• chr11-5254705-GTC-ATT

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_000184.3(HBG2):​c.22G>A​(p.Asp8Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as other (no stars).

• Frequency:
  • Genomes: not found (cov: 23)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: HBG2 NM_000184.3 missense
• Clinical Significance: other no assertion criteria provided O:1
• Conservation: PhyloP100: 0.607
• Publications: 1 publications found

Genes affected

HBG2 (HGNC:4832): (hemoglobin subunit gamma 2) 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]

HBG2 Gene-Disease associations (from GenCC):

• hemoglobinopathy Toms River

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• hereditary persistence of fetal hemoglobin-beta-thalassemia syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• hereditary persistence of fetal hemoglobin-sickle cell disease syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• cyanosis, transient neonatal

  Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

ENSG00000284931 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000184.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HBG2	NM_000184.3	MANE Select	c.22G>A	p.Asp8Asn	missense	Exon 1 of 3	NP_000175.1	D9YZU9

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HBG2	ENST00000336906.6	TSL:1 MANE Select	c.22G>A	p.Asp8Asn	missense	Exon 1 of 3	ENSP00000338082.4	P69892
	ENSG00000284931	ENST00000642908.1		c.22G>A	p.Asp8Asn	missense	Exon 1 of 3	ENSP00000495346.1	A0AA75LVZ2
	ENSG00000239920	ENST00000380259.7	TSL:5	n.*1325G>A		non_coding_transcript_exon	Exon 7 of 8	ENSP00000369609.3	A0A2U3TZJ3

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Data not reliable, filtered out with message: AC0;AS_VQSR AF: 0.00 AC: 0 AN: 579476 Hom.: 0 Cov.: 7 AF XY: 0.00 AC XY: 0 AN XY: 304682

African (AFR) AF: 0.00 AC: 0 AN: 15806

American (AMR) AF: 0.00 AC: 0 AN: 27158

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 16256

East Asian (EAS) AF: 0.00 AC: 0 AN: 32158

South Asian (SAS) AF: 0.00 AC: 0 AN: 53432

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 34062

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 2296

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 367786

Other (OTH) AF: 0.00 AC: 0 AN: 30522

GnomAD4 genome Cov.: 23

ClinVar

ClinVar submissions

Significance: other

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
-	-	-	HEMOGLOBIN F (AUCKLAND) (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.26
BayesDel_addAF	Uncertain	0.12	D
BayesDel_noAF	Uncertain	-0.070
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Benign	0.069	T
Eigen	Benign	0.00088
Eigen_PC	Benign	0.027
FATHMM_MKL	Uncertain	0.78	D
LIST_S2	Benign	0.78	T
M_CAP	Uncertain	0.17	D
MetaRNN	Uncertain	0.44	T
MetaSVM	Uncertain	0.30	D
MutationAssessor	Uncertain	2.1	M
PhyloP100		0.61
PROVEAN	Benign	-1.7	N
REVEL	Uncertain	0.43
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.0060	D
PromoterAI		0.0018	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.75
gMVP		0.62
Mutation Taster		=34/66	disease causing

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs34501593;

hg19: chr11-5275937;