1-118884889-G-A

Variant names:

• chr1-118884889-G-A
• NM_001330677.2:c.1652C>T

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001330677.2(TBX15):​c.1652C>T​(p.Ala551Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000342 in 1,461,868 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: TBX15 NM_001330677.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.46
• Publications: 0 publications found

Genes affected

TBX15 (HGNC:11594): (T-box transcription factor 15) This gene belongs to the T-box family of genes, which encode a phylogenetically conserved family of transcription factors that regulate a variety of developmental processes. All these genes contain a common T-box DNA-binding domain. Mutations in this gene are associated with Cousin syndrome.[provided by RefSeq, Oct 2009]

TBX15 Gene-Disease associations (from GenCC):

• pelviscapular dysplasia

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Labcorp Genetics (formerly Invitae), Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TBX15	NM_001330677.2	c.1652C>T	p.Ala551Val	missense_variant	Exon 8 of 8	ENST00000369429.5	NP_001317606.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TBX15	ENST00000369429.5	c.1652C>T	p.Ala551Val	missense_variant	Exon 8 of 8	5	NM_001330677.2	ENSP00000358437.3
TBX15	ENST00000207157.7	c.1334C>T	p.Ala445Val	missense_variant	Exon 8 of 8	1		ENSP00000207157.3
TBX15	ENST00000449873.5	c.836C>T	p.Ala279Val	missense_variant	Exon 4 of 4	5		ENSP00000398625.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000342 AC: 5 AN: 1461868 Hom.: 0 Cov.: 33 AF XY: 0.00000275 AC XY: 2 AN XY: 727228

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39688

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53416

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000450 AC: 5 AN: 1112002

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Jul 26, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 445 of the TBX15 protein (p.Ala445Val). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with TBX15-related conditions. ClinVar contains an entry for this variant (Variation ID: 1932803). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be tolerated. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.087
BayesDel_addAF	Pathogenic	0.20	D
BayesDel_noAF	Uncertain	0.050
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.025	.;T;T
Eigen	Uncertain	0.38
Eigen_PC	Uncertain	0.52
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.89	D;D;D
M_CAP	Benign	0.038	D
MetaRNN	Uncertain	0.46	T;T;T
MetaSVM	Uncertain	0.057	D
MutationAssessor	Benign	1.8	.;.;L
PhyloP100		9.5
PrimateAI	Uncertain	0.68	T
PROVEAN	Benign	-0.81	N;N;N
REVEL	Uncertain	0.46
Sift	Uncertain	0.014	D;D;D
Sift4G	Benign	0.25	T;D;T
Polyphen		0.39	.;.;B
Vest4		0.46
MutPred		0.11		.;.;Gain of catalytic residue at A551 (P = 0.1693);
MVP		0.60
MPC		0.43
ClinPred		0.93	D
GERP RS		5.3
Varity_R		0.29
gMVP		0.29
Mutation Taster		=56/44	polymorphism

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

hg19: chr1-119427512;