22-19766732-T-G

Position:

chr22-19766732-T-G

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 0P and 7B. BP4_ModerateBS1_SupportingBS2

The NM_001379200.1(TBX1):c.1380T>G(p.His460Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000551 in 1,541,468 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 11/18 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000060 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000055 ( 0 hom. )

Consequence

TBX1
NM_001379200.1 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.0100

Variant links:

Genes affected

TBX1 (HGNC:11592): (T-box transcription factor 1) This gene is a member of a phylogenetically conserved family of genes that share a common DNA-binding domain, the T-box. T-box genes encode transcription factors involved in the regulation of developmental processes. This gene product shares 98% amino acid sequence identity with the mouse ortholog. DiGeorge syndrome (DGS)/velocardiofacial syndrome (VCFS), a common congenital disorder characterized by neural-crest-related developmental defects, has been associated with deletions of chromosome 22q11.2, where this gene has been mapped. Studies using mouse models of DiGeorge syndrome suggest a major role for this gene in the molecular etiology of DGS/VCFS. Several alternatively spliced transcript variants encoding different isoforms have been described for this gene. [provided by RefSeq, Jul 2008]

TBX1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -7 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.21027526).

BS1

Variant frequency is greater than expected in population sas. gnomad4 allele frequency = 0.0000596 (9/150886) while in subpopulation SAS AF= 0.000208 (1/4804). AF 95% confidence interval is 0.0000327. There are 0 homozygotes in gnomad4. There are 5 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High AC in GnomAd4 at 9 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TBX1	NM_001379200.1 linkuse as main transcript	c.1380T>G	p.His460Gln	missense_variant	7/7	ENST00000649276.2	NP_001366129.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TBX1	ENST00000649276.2 linkuse as main transcript	c.1380T>G	p.His460Gln	missense_variant	7/7		NM_001379200.1	ENSP00000497003	A2
TBX1	ENST00000332710.8 linkuse as main transcript	c.1353T>G	p.His451Gln	missense_variant	9/9	1		ENSP00000331791	P2	O43435-3
TBX1	ENST00000329705.11 linkuse as main transcript	c.1009+730T>G		intron_variant		1		ENSP00000331176	A2	O43435-1
TBX1	ENST00000359500.7 linkuse as main transcript	c.1009+730T>G		intron_variant		1		ENSP00000352483	A2	O43435-2

Frequencies

GnomAD3 genomes

AF:

0.0000597

AC:

AN:

150780

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000979

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000208

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000591

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000235

AC:

AN:

170270

Hom.:

AF XY:

0.0000309

AC XY:

AN XY:

97122

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000360

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000121

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000547

AC:

AN:

1390582

Hom.:

Cov.:

AF XY:

0.0000607

AC XY:

AN XY:

691520

show subpopulations

Gnomad4 AFR exome

AF:

0.000104

Gnomad4 AMR exome

AF:

0.0000256

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000120

Gnomad4 SAS exome

AF:

0.000174

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000488

Gnomad4 OTH exome

AF:

0.0000174

GnomAD4 genome

AF:

0.0000596

AC:

AN:

150886

Hom.:

Cov.:

AF XY:

0.0000678

AC XY:

AN XY:

73728

show subpopulations

Gnomad4 AFR

AF:

0.0000976

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000208

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000591

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000378

ExAC

AF:

0.0000269

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

DiGeorge syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 16, 2023

This sequence change replaces histidine, which is basic and polar, with glutamine, which is neutral and polar, at codon 451 of the TBX1 protein (p.His451Gln). This variant is present in population databases (rs367711718, gnomAD 0.01%). This variant has not been reported in the literature in individuals affected with TBX1-related conditions. ClinVar contains an entry for this variant (Variation ID: 956184). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Benign

-0.17

BayesDel_noAF

Benign

-0.25

CADD

Benign

DANN

Benign

0.96

Eigen

Benign

-0.84

Eigen_PC

Benign

-0.90

FATHMM_MKL

Benign

0.22

LIST_S2

Benign

0.35

T;T

M_CAP

Pathogenic

0.98

MetaRNN

Benign

0.21

T;T

MetaSVM

Benign

-0.69

MutationTaster

Benign

0.62

D;D;D

PrimateAI

Pathogenic

0.94

PROVEAN

Benign

-0.62

N;.

REVEL

Uncertain

0.31

Sift

Benign

0.035

D;.

Sift4G

Benign

0.22

T;.

Vest4

0.34

MutPred

0.092

Loss of glycosylation at P452 (P = 0.0977);.;

MVP

0.59

MPC

1.1

ClinPred

0.83

GERP RS

1.7

gMVP

0.36

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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