12-114394847-A-T

Variant names:

• chr12-114394847-A-T
• rs1555226019
• NM_181486.4:c.557T>A

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_181486.4(TBX5):​c.557T>A​(p.Val186Glu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V186G) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TBX5 NM_181486.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 9.25
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• Holt-Oram syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), ClinGen, G2P, PanelApp Australia, Orphanet
• heart conduction disease

  Inheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.932

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_181486.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TBX5	NM_181486.4	MANE Select	c.557T>A	p.Val186Glu	missense	Exon 6 of 9	NP_852259.1	Q99593-1
	TBX5	NM_000192.3		c.557T>A	p.Val186Glu	missense	Exon 6 of 9	NP_000183.2	Q99593-1
	TBX5	NM_080717.4		c.407T>A	p.Val136Glu	missense	Exon 5 of 8	NP_542448.1	Q99593-3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TBX5	ENST00000405440.7	TSL:1 MANE Select	c.557T>A	p.Val186Glu	missense	Exon 6 of 9	ENSP00000384152.3	Q99593-1
	TBX5	ENST00000310346.8	TSL:1	c.557T>A	p.Val186Glu	missense	Exon 6 of 9	ENSP00000309913.4	Q99593-1
	TBX5	ENST00000349716.9	TSL:1	c.407T>A	p.Val136Glu	missense	Exon 5 of 8	ENSP00000337723.5	Q99593-3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
PhyloP100		9.2
Varity_R		0.98
gMVP		0.95
Mutation Taster		=1/99	disease causing

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs1555226019; hg19: chr12-114832652;