Genetic Variant NM_000184.3:c.103G>A (chr11-5254504-C-T) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

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

The NM_000184.3(HBG2):c.103G>A(p.Val35Ile) variant causes a missense change. The variant allele was found at a frequency of 0.0000124 in 1,612,916 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as other (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V35A) has been classified as Uncertain significance.

Frequency

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

Exomes 𝑓: 0.000013 ( 0 hom. )

Consequence

HBG2
NM_000184.3 missense

Scores

Clinical Significance

other no assertion criteria provided O:1

Conservation

PhyloP100: 4.62

Publications

2 publications found

Variant links:

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)

HBG2 links:

ENSG00000284931 (HGNC:):

ENSG00000284931 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HBG2	NM_000184.3 link	c.103G>A	p.Val35Ile	missense_variant	Exon 2 of 3	ENST00000336906.6	NP_000175.1	P69892D9YZU9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
HBG2	ENST00000336906.6 link	c.103G>A	p.Val35Ile	missense_variant	Exon 2 of 3	1	NM_000184.3	ENSP00000338082.4	P69892
ENSG00000284931	ENST00000642908.1 link	c.103G>A	p.Val35Ile	missense_variant	Exon 2 of 3			ENSP00000495346.1
ENSG00000239920	ENST00000380259.7 link	n.*1406G>A		non_coding_transcript_exon_variant	Exon 8 of 8	5		ENSP00000369609.3	A0A2U3TZJ3
ENSG00000239920	ENST00000380259.7 link	n.*1406G>A		3_prime_UTR_variant	Exon 8 of 8	5		ENSP00000369609.3	A0A2U3TZJ3

Frequencies

GnomAD3 genomes

AF:

0.00000659

AC:

AN:

151702

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:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.0000130

AC:

AN:

1461214

Hom.:

Cov.:

AF XY:

0.0000151

AC XY:

AN XY:

726948

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33466

American (AMR)

AF:

0.00

AC:

AN:

44702

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26132

East Asian (EAS)

AF:

0.000428

AC:

AN:

39694

South Asian (SAS)

AF:

0.00

AC:

AN:

86248

European-Finnish (FIN)

AF:

0.0000187

AC:

AN:

53406

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111436

Other (OTH)

AF:

0.0000166

AC:

AN:

60366

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.322

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00000659

AC:

AN:

151702

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74020

show subpopulations

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

41340

American (AMR)

AF:

0.00

AC:

AN:

15208

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.000193

AC:

AN:

5176

South Asian (SAS)

AF:

0.00

AC:

AN:

4782

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10494

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67912

Other (OTH)

AF:

0.00

AC:

AN:

2094

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.00000378

ClinVar

Significance: other

Submissions summary: Other:1

Revision: no assertion criteria provided

LINK: link

Submissions by phenotype

HEMOGLOBIN F (TOKYO)

Other:1

Aug 05, 2011

OMIM

Significance:other

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.18

BayesDel_addAF

Uncertain

0.16

BayesDel_noAF

Uncertain

-0.010

CADD

Benign

(source)

DANN

Uncertain

1.0

Eigen

Benign

0.16

Eigen_PC

Benign

0.15

FATHMM_MKL

Uncertain

0.91

M_CAP

Benign

0.075

MetaRNN

Uncertain

0.54

PhyloP100

4.6

Vest4

0.60

ClinPred

0.88

GERP RS

3.0

PromoterAI

-0.035

Neutral

(source)

Varity_R

0.70

Mutation Taster

=33/67

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over