12-114354623-T-C

Position:

• chr12-114354623-T-C

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BS1 BS2

The NM_181486.4(TBX5):​c.*909A>G variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0019 in 152,774 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency:
  • Genomes: 𝑓 0.0019 (2 hom., cov: 32)
  • Exomes 𝑓: 0.0046 (0 hom.)
• Consequence: TBX5 NM_181486.4 3_prime_UTR
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.719

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]

ACMG classification

Verdict is Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.84).
• BP6: Variant 12-114354623-T-C is Benign according to our data. Variant chr12-114354623-T-C is described in ClinVar as [Benign]. Clinvar id is 307278.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS1: Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.0019 (289/152342) while in subpopulation AMR AF= 0.00301 (46/15306). AF 95% confidence interval is 0.00231. There are 2 homozygotes in gnomad4. There are 154 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 289 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TBX5	NM_181486.4	c.*909A>G		3_prime_UTR_variant	9/9	ENST00000405440.7
TBX5	NM_000192.3	c.*909A>G		3_prime_UTR_variant	9/9
TBX5	NM_080717.4	c.*909A>G		3_prime_UTR_variant	8/8
TBX5	XM_017019912.2	c.*909A>G		3_prime_UTR_variant	9/9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TBX5	ENST00000405440.7	c.*909A>G		3_prime_UTR_variant	9/9	1	NM_181486.4	P1
TBX5	ENST00000310346.8	c.*909A>G		3_prime_UTR_variant	9/9	1		P1
TBX5	ENST00000349716.9	c.*909A>G		3_prime_UTR_variant	8/8	1

Frequencies

GnomAD3 genomes AF: 0.00190 AC: 289 AN: 152224 Hom.: 2 Cov.: 32

Gnomad AFR AF: 0.000531

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00301

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00602

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00223

Gnomad OTH AF: 0.00191

GnomAD4 exome AF: 0.00463 AC: 2 AN: 432 Hom.: 0 Cov.: 0 AF XY: 0.00758 AC XY: 2 AN XY: 264

Gnomad4 FIN exome AF: 0.00472

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.00190 AC: 289 AN: 152342 Hom.: 2 Cov.: 32 AF XY: 0.00207 AC XY: 154 AN XY: 74506

Gnomad4 AFR AF: 0.000529

Gnomad4 AMR AF: 0.00301

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00602

Gnomad4 NFE AF: 0.00223

Gnomad4 OTH AF: 0.00189

Alfa AF: 0.00201 Hom.: 0

Bravo AF: 0.00153

Asia WGS AF: 0.000577 AC: 2 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Holt-Oram syndrome Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.84
CADD	Benign	0.47
DANN	Benign	0.72

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

LitVar

Other links and lift over

dbSNP: rs184360838; hg19: chr12-114792428;