rs377625550

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PP3_Moderate

The NM_181486.4(TBX5):c.781A>T(p.Ser261Cys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000496 in 1,614,026 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000048 ( 0 hom. )

Consequence

TBX5
NM_181486.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 7.67

Variant links:

Genes affected

TBX5 (HGNC:11604): (T-box transcription factor 5) 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 is closely linked to related family member T-box 3 (ulnar mammary syndrome) on human chromosome 12. The encoded protein may play a role in heart development and specification of limb identity. Mutations in this gene have been associated with Holt-Oram syndrome, a developmental disorder affecting the heart and upper limbs. Several transcript variants encoding different isoforms have been described for this gene. [provided by RefSeq, Jul 2008]

TBX5 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.864

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
TBX5	NM_181486.4 linkuse as main transcript	c.781A>T	p.Ser261Cys	missense_variant	8/9	ENST00000405440.7
TBX5	NM_000192.3 linkuse as main transcript	c.781A>T	p.Ser261Cys	missense_variant	8/9
TBX5	NM_080717.4 linkuse as main transcript	c.631A>T	p.Ser211Cys	missense_variant	7/8
TBX5	XM_017019912.2 linkuse as main transcript	c.829A>T	p.Ser277Cys	missense_variant	8/9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TBX5	ENST00000405440.7 linkuse as main transcript	c.781A>T	p.Ser261Cys	missense_variant	8/9	1	NM_181486.4	P1	Q99593-1
TBX5	ENST00000310346.8 linkuse as main transcript	c.781A>T	p.Ser261Cys	missense_variant	8/9	1		P1	Q99593-1
TBX5	ENST00000349716.9 linkuse as main transcript	c.631A>T	p.Ser211Cys	missense_variant	7/8	1			Q99593-3
TBX5	ENST00000526441.1 linkuse as main transcript	c.781A>T	p.Ser261Cys	missense_variant	7/7	1			Q99593-2

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152144

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:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251182

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135788

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.00000479

AC:

AN:

1461882

Hom.:

Cov.:

AF XY:

0.00000688

AC XY:

AN XY:

727244

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

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:

0.00000450

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152144

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74322

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

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:

0.00

Alfa

AF:

0.0000282

Hom.:

Bravo

AF:

0.0000151

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Holt-Oram syndrome

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Aug 05, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Baylor Genetics	Sep 29, 2022	- -

Aortic valve disease 2

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Sep 25, 2023

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. Experimental studies have shown that this missense change affects TBX5 function (PMID: 26859351). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt TBX5 protein function. ClinVar contains an entry for this variant (Variation ID: 518540). This missense change has been observed in individual(s) with Holt-Oram syndrome (PMID: 12789647). It has also been observed to segregate with disease in related individuals. This variant is present in population databases (rs377625550, gnomAD 0.003%). This sequence change replaces serine, which is neutral and polar, with cysteine, which is neutral and slightly polar, at codon 261 of the TBX5 protein (p.Ser261Cys). -

Cardiovascular phenotype

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 20, 2023

The p.S261C variant (also known as c.781A>T), located in coding exon 7 of the TBX5 gene, results from an A to T substitution at nucleotide position 781. The serine at codon 261 is replaced by cysteine, an amino acid with dissimilar properties. This variant was previously reported in a family with features of Holt-Oram syndrome, and one study proposed this alteration may impact gene interactions involved in transcription and cardiac development (Brassington AM et al. Am J Hum Genet. 2003;73:74-85; Waldron L et al. Dev Cell. 2016;36(3):262-75). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.35

BayesDel_addAF

Pathogenic

0.32

BayesDel_noAF

Pathogenic

0.31

Cadd

Pathogenic

Dann

Uncertain

0.99

Eigen

Pathogenic

0.82

Eigen_PC

Pathogenic

0.80

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.93

D;.;D;D

M_CAP

Uncertain

0.21

MetaRNN

Pathogenic

0.86

D;D;D;D

MetaSVM

Uncertain

0.54

MutationTaster

Benign

1.0

D;D;D;D

PrimateAI

Uncertain

0.77

PROVEAN

Uncertain

-2.4

N;D;D;N

REVEL

Pathogenic

0.88

Sift

Pathogenic

0.0

D;D;D;D

Sift4G

Uncertain

0.0060

D;D;D;D

Polyphen

1.0, 1.0

.;D;D;D

Vest4

0.77

MVP

0.89

MPC

1.8

ClinPred

0.98

GERP RS

5.6

Varity_R

0.60

gMVP

0.59

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

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