chr22-19760999-CCCG-C

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 0P and 3B. BP3BP6_Moderate

The NM_001379200.1(TBX1):c.170_172delCGC(p.Pro57del) variant causes a disruptive inframe deletion change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00149 in 782,448 control chromosomes in the GnomAD database, with no homozygous occurrence. There is a variant allele frequency bias in the population database for this variant (GnomAdExome4), which may indicate mosaicism or somatic mutations in the reference population data. Variant has been reported in ClinVar as Likely benign (★). Synonymous variant affecting the same amino acid position (i.e. P57P) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0 ( 0 hom., cov: 31)

Exomes 𝑓: 0.0015 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

TBX1
NM_001379200.1 disruptive_inframe_deletion

Scores

Not classified

Clinical Significance

Likely benign criteria provided, single submitter B:1

Conservation

PhyloP100: 1.41

Publications

0 publications found

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 Gene-Disease associations (from GenCC):

conotruncal heart malformations
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
DiGeorge syndrome
Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
velocardiofacial syndrome
Inheritance: AD Classification: STRONG Submitted by: Ambry Genetics
22q11.2 deletion syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

TBX1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -3 ACMG points.

BP3

Nonframeshift variant in repetitive region in NM_001379200.1

BP6

Variant 22-19760999-CCCG-C is Benign according to our data. Variant chr22-19760999-CCCG-C is described in ClinVar as [Likely_benign]. Clinvar id is 3324840.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TBX1	NM_001379200.1 link	c.170_172delCGC	p.Pro57del	disruptive_inframe_deletion	Exon 1 of 7	ENST00000649276.2	NP_001366129.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TBX1	ENST00000649276.2 link	c.170_172delCGC	p.Pro57del	disruptive_inframe_deletion	Exon 1 of 7		NM_001379200.1	ENSP00000497003.1		A0A3B3IS18

Frequencies

GnomAD3 genomes

AF:

0.00

AC:

AN:

145488

Hom.:

Cov.:

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00

AC:

AN:

292

AF XY:

0.00

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00149

AC:

1165

AN:

782448

Hom.:

AF XY:

0.00150

AC XY:

544

AN XY:

362398

show subpopulations

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

African (AFR)

AF:

0.00177

AC:

AN:

14698

American (AMR)

AF:

0.00327

AC:

AN:

918

Ashkenazi Jewish (ASJ)

AF:

0.00289

AC:

AN:

4848

East Asian (EAS)

AF:

0.00180

AC:

AN:

3340

South Asian (SAS)

AF:

0.00185

AC:

AN:

16252

European-Finnish (FIN)

AF:

0.00

AC:

AN:

260

Middle Eastern (MID)

AF:

0.00195

AC:

AN:

1540

European-Non Finnish (NFE)

AF:

0.00146

AC:

1047

AN:

715028

Other (OTH)

AF:

0.00141

AC:

AN:

25564

⚠️ 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: 0.242

Heterozygous variant carriers

185

370

556

741

926

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

108

162

216

270

<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

Data not reliable, filtered out with message: AC0

AF:

0.00

AC:

AN:

145488

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

70692

African (AFR)

AF:

0.00

AC:

AN:

40636

American (AMR)

AF:

0.00

AC:

AN:

14678

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3380

East Asian (EAS)

AF:

0.00

AC:

AN:

4970

South Asian (SAS)

AF:

0.00

AC:

AN:

4784

European-Finnish (FIN)

AF:

0.00

AC:

AN:

8282

Middle Eastern (MID)

AF:

0.00

AC:

AN:

298

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

65558

Other (OTH)

AF:

0.00

AC:

AN:

1998

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Cardiovascular phenotype

Benign:1

May 15, 2024

Ambry Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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

PhyloP100

1.4

Mutation Taster

=78/22

polymorphism

(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