Genetic Variant CHGB:p.Thr116Ala (chr20-5922490-A-G) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_001819.3(CHGB):c.346A>G(p.Thr116Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000106 in 1,613,432 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00060 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000054 ( 0 hom. )

Consequence

CHGB
NM_001819.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.00800

Variant links:

Genes affected

CHGB (HGNC:1930): (chromogranin B) This gene encodes a tyrosine-sulfated secretory protein abundant in peptidergic endocrine cells and neurons. This protein may serve as a precursor for regulatory peptides. [provided by RefSeq, Jan 2009]

CHGB links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.011378676).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHGB	NM_001819.3 link	c.346A>G	p.Thr116Ala	missense_variant	Exon 4 of 5	ENST00000378961.9	NP_001810.2	P05060

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CHGB	ENST00000378961.9 link	c.346A>G	p.Thr116Ala	missense_variant	Exon 4 of 5	1	NM_001819.3	ENSP00000368244.4		P05060
CHGB	ENST00000455042.1 link	c.286A>G	p.Thr96Ala	missense_variant	Exon 5 of 5	3		ENSP00000416643.1		A0A0A0MT66

Frequencies

GnomAD3 genomes

AF:

0.000611

AC:

AN:

152136

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00203

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000458

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:

0.0000147

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000172

AC:

AN:

249694

Hom.:

AF XY:

0.000126

AC XY:

AN XY:

134992

show subpopulations

Gnomad AFR exome

AF:

0.00224

Gnomad AMR exome

AF:

0.000116

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000491

GnomAD4 exome

AF:

0.0000541

AC:

AN:

1461178

Hom.:

Cov.:

AF XY:

0.0000385

AC XY:

AN XY:

726758

show subpopulations

Gnomad4 AFR exome

AF:

0.00194

Gnomad4 AMR exome

AF:

0.000202

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:

0.0000828

GnomAD4 genome

AF:

0.000604

AC:

AN:

152254

Hom.:

Cov.:

AF XY:

0.000564

AC XY:

AN XY:

74466

show subpopulations

Gnomad4 AFR

AF:

0.00200

Gnomad4 AMR

AF:

0.000458

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.000296

Hom.:

Bravo

AF:

0.000684

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00

AC:

ESP6500AA

AF:

0.00272

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000157

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Dec 16, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.346A>G (p.T116A) alteration is located in exon 4 (coding exon 4) of the CHGB gene. This alteration results from a A to G substitution at nucleotide position 346, causing the threonine (T) at amino acid position 116 to be replaced by an alanine (A). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.071

BayesDel_addAF

Benign

-0.59

BayesDel_noAF

Benign

-0.63

CADD

Benign

0.091

DANN

Benign

0.38

DEOGEN2

Benign

0.065

T;T

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.1

FATHMM_MKL

Benign

0.049

LIST_S2

Benign

0.42

T;T

M_CAP

Benign

0.012

MetaRNN

Benign

0.011

T;T

MetaSVM

Benign

-0.90

MutationAssessor

Benign

1.6

L;.

PrimateAI

Benign

0.27

PROVEAN

Benign

-0.52

N;N

REVEL

Benign

0.023

Sift

Benign

0.15

T;T

Sift4G

Benign

0.78

T;T

Polyphen

0.0050

B;.

Vest4

0.028

MVP

0.17

MPC

0.094

ClinPred

0.0068

GERP RS

-1.0

Varity_R

0.041

gMVP

0.18

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