rs369050575

Positions:

chr22-19761172-TGAA-T

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 1P and 9B. PM4_SupportingBP6BS1BS2

The NM_001379200.1(TBX1):c.336_338delGAA(p.Lys112del) variant causes a disruptive inframe deletion change. The variant allele was found at a frequency of 0.000142 in 1,526,856 control chromosomes in the GnomAD database, including 1 homozygotes. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00033 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00012 ( 1 hom. )

Consequence

TBX1
NM_001379200.1 disruptive_inframe_deletion

Scores

Not classified

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:7

Conservation

PhyloP100: 4.20

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 -8 ACMG points.

PM4

Nonframeshift variant in NON repetitive region in NM_001379200.1. Strenght limited to Supporting due to length of the change: 1aa.

BP6

Variant 22-19761172-TGAA-T is Benign according to our data. Variant chr22-19761172-TGAA-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 455791.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=1, Likely_benign=2, Benign=2}. Variant chr22-19761172-TGAA-T is described in Lovd as [Likely_benign].

BS1

Variant frequency is greater than expected in population eas. gnomad4 allele frequency = 0.000332 (50/150402) while in subpopulation EAS AF= 0.00731 (37/5062). AF 95% confidence interval is 0.00545. There are 0 homozygotes in gnomad4. There are 24 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High AC in GnomAd4 at 50 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TBX1	NM_001379200.1 link	c.336_338delGAA	p.Lys112del	disruptive_inframe_deletion	1/7	ENST00000649276.2	NP_001366129.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TBX1	ENST00000649276.2 link	c.336_338delGAA	p.Lys112del	disruptive_inframe_deletion	1/7		NM_001379200.1	ENSP00000497003.1		A0A3B3IS18

Frequencies

GnomAD3 genomes

AF:

0.000333

AC:

AN:

150306

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000977

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000264

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00728

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000148

Gnomad OTH

AF:

0.00193

GnomAD3 exomes

AF:

0.000398

AC:

AN:

198560

Hom.:

AF XY:

0.000290

AC XY:

AN XY:

110292

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00655

Gnomad SAS exome

AF:

0.0000787

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000221

GnomAD4 exome

AF:

0.000121

AC:

167

AN:

1376454

Hom.:

AF XY:

0.0000949

AC XY:

AN XY:

684920

show subpopulations

Gnomad4 AFR exome

AF:

0.0000356

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00312

Gnomad4 SAS exome

AF:

0.0000251

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000281

Gnomad4 OTH exome

AF:

0.00114

GnomAD4 genome

AF:

0.000332

AC:

AN:

150402

Hom.:

Cov.:

AF XY:

0.000327

AC XY:

AN XY:

73430

show subpopulations

Gnomad4 AFR

AF:

0.0000974

Gnomad4 AMR

AF:

0.000264

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00731

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000148

Gnomad4 OTH

AF:

0.00192

Alfa

AF:

0.000142

Hom.:

Bravo

AF:

0.000310

Asia WGS

AF:

0.00325

AC:

AN:

3404

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:7

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1Benign:3

Likely benign, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Feb 28, 2019	This variant is associated with the following publications: (PMID: 28272434) -
Likely benign, no assertion criteria provided	clinical testing	Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)	-	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Oct 01, 2020	- -

not specified

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Sep 24, 2024

Variant summary: TBX1 c.309_311delGAA (p.Lys103del) results in an in-frame deletion that is predicted to remove one amino acid from the encoded protein. The variant allele was found at a frequency of 0.0004 in 198560 control chromosomes, predominantly at a frequency of 0.65% within the East Asian subpopulation in the gnomAD database, including 2 homozygotes. The observed variant frequency within East Asian control individuals in the gnomAD database exceeds the estimated maximal expected allele frequency for a pathogenic variant in TBX1 causing TBX1-Related Disorders phenotype. The variant, c.309_311delGAA, has been reported in a cohort of Chinese individuals affected with (suspected) TBX1-Related Disorders with an allele frequency of 1.2%, including 1 homozygous patient (Xu_2017). Authors of this study also reported experimental evidence evaluating an impact on protein function, and demonstrated decreased protein levels together with decreased transcriptional activity in in vitro expression systems (Xu_2017), however neither decreased mRNA levels, nor increased protein degradation was found which could explain their findings, thus these data do not allow convincing conclusions about the variant effect. The following publication have been ascertained in the context of this evaluation (PMID: 28272434). ClinVar contains an entry for this variant (Variation ID: 455791). Based on the evidence outlined above, the variant was classified as likely benign. -

TBX1-related disorder

Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Nov 27, 2019

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

DiGeorge syndrome

Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 18, 2024

- -

Cardiovascular phenotype

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 25, 2018

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

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