12-114366343-G-T

Variant names:

• chr12-114366343-G-T
• rs35110399
• NM_181486.4:c.804C>A

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP7

The NM_181486.4(TBX5):​c.804C>A​(p.Ala268Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. A268A) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TBX5 NM_181486.4 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.08
• Publications: 1 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: ClinGen, Labcorp Genetics (formerly Invitae), Orphanet, G2P, Ambry Genetics
• heart conduction disease

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

ACMG classification

Our verdict: Likely_benign. The variant received -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.44).
• BP7: Synonymous conserved (PhyloP=1.08 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TBX5	NM_181486.4	c.804C>A	p.Ala268Ala	synonymous_variant	Exon 8 of 9	ENST00000405440.7	NP_852259.1
TBX5	NM_000192.3	c.804C>A	p.Ala268Ala	synonymous_variant	Exon 8 of 9		NP_000183.2
TBX5	NM_080717.4	c.654C>A	p.Ala218Ala	synonymous_variant	Exon 7 of 8		NP_542448.1
TBX5	XM_017019912.2	c.852C>A	p.Ala284Ala	synonymous_variant	Exon 8 of 9		XP_016875401.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TBX5	ENST00000405440.7	c.804C>A	p.Ala268Ala	synonymous_variant	Exon 8 of 9	1	NM_181486.4	ENSP00000384152.3
TBX5	ENST00000310346.8	c.804C>A	p.Ala268Ala	synonymous_variant	Exon 8 of 9	1		ENSP00000309913.4
TBX5	ENST00000349716.9	c.654C>A	p.Ala218Ala	synonymous_variant	Exon 7 of 8	1		ENSP00000337723.5
TBX5	ENST00000526441.1	c.804C>A	p.Ala268Ala	synonymous_variant	Exon 7 of 7	1		ENSP00000433292.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.44
CADD	Benign	8.7
DANN	Benign	0.73
PhyloP100		1.1

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

Other links and lift over

dbSNP: rs35110399; hg19: chr12-114804148; COSMIC: COSV100090560;