17-61456554-G-T

Variant names:

• chr17-61456554-G-T
• NM_001321120.2:c.64G>T

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_001321120.2(TBX4):​c.64G>T​(p.Gly22*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: TBX4 NM_001321120.2 stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:1 O:1
• Conservation: PhyloP100: 1.03

Genes affected

TBX4 (HGNC:11603): (T-box transcription factor 4) 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 the human homolog of mouse Tbx4, which is closely linked to Tbx2 on mouse chromosome 11. Similarly this gene, like TBX2, maps to human chromosome 17. Expression studies in mouse and chicken show that Tbx4 is expressed in developing hindlimb, but not in forelimb buds, suggesting a role for this gene in regulating limb development and specification of limb identity. [provided by RefSeq, Jul 2008]

LOC124904042 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 53 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 17-61456554-G-T is Pathogenic according to our data. Variant chr17-61456554-G-T is described in ClinVar as [Pathogenic]. Clinvar id is 1341425.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TBX4	NM_001321120.2	c.64G>T	p.Gly22*	stop_gained	Exon 2 of 9	ENST00000644296.1	NP_001308049.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TBX4	ENST00000644296.1	c.64G>T	p.Gly22*	stop_gained	Exon 2 of 9		NM_001321120.2	ENSP00000495986.1
TBX4	ENST00000240335.1	c.64G>T	p.Gly22*	stop_gained	Exon 1 of 8	1		ENSP00000240335.1
TBX4	ENST00000642491.1	c.64G>T	p.Gly22*	stop_gained	Exon 1 of 8			ENSP00000495714.1
TBX4	ENST00000589003.5	c.-125-70G>T		intron_variant	Intron 1 of 5	3		ENSP00000467588.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1399198 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 690512

Gnomad4 AFR exome AF: 0.00

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1 Other:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

May 18, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with pulmonary arterial hypertension (PMID: 30578397). ClinVar contains an entry for this variant (Variation ID: 1341425). For these reasons, this variant has been classified as Pathogenic. This sequence change creates a premature translational stop signal (p.Gly22*) in the TBX4 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in TBX4 are known to be pathogenic (PMID: 15106123, 31151956, 31761294, 31965066, 32079640). -

Pulmonary hypertension, primary, 1 Other:1

-

Wendy Chung Laboratory, Columbia University Medical Center

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.49	D
BayesDel_noAF	Pathogenic	0.46
CADD	Pathogenic	37
DANN	Uncertain	0.99
Eigen	Uncertain	0.54
Eigen_PC	Uncertain	0.32
FATHMM_MKL	Uncertain	0.92	D
Vest4		0.71
GERP RS		2.5

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr17-59533915;