3-177026399-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2 PP2 BP4

The NM_024665.7(TBL1XR1):c.1492G>A(p.Val498Ile) 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 benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: TBL1XR1 NM_024665.7 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.57

Genes affected

TBL1XR1 (HGNC:29529): (TBL1X/Y related 1) This gene is a member of the WD40 repeat-containing gene family and shares sequence similarity with transducin (beta)-like 1X-linked (TBL1X). The protein encoded by this gene is thought to be a component of both nuclear receptor corepressor (N-CoR) and histone deacetylase 3 (HDAC 3) complexes, and is required for transcriptional activation by a variety of transcription factors. Mutations in these gene have been associated with some autism spectrum disorders, and one finding suggests that haploinsufficiency of this gene may be a cause of intellectual disability with dysmorphism. Mutations in this gene as well as recurrent translocations involving this gene have also been observed in some tumors. [provided by RefSeq, Mar 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, TBL1XR1
• BP4: Computational evidence support a benign effect (MetaRNN=0.3284246).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TBL1XR1	NM_024665.7	c.1492G>A	p.Val498Ile	missense_variant	15/16	ENST00000457928.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TBL1XR1	ENST00000457928.7	c.1492G>A	p.Val498Ile	missense_variant	15/16	1	NM_024665.7	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Feb 19, 2017

The V498I variant in the TBL1XR1 gene has not been reported previously as a pathogenic variant, nor as a benign variant, to our knowledge. The V498I variant is not observed in large population cohorts (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). The V498I variant is a conservative amino acid substitution, which is not likely to impact secondary protein structure as these residues share similar properties. This substitution occurs at a position that is conserved across species. In silico analysis is inconsistent in its predictions as to whether or not the variant is damaging to the protein structure/function. We interpret V498I as a variant of uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.37
BayesDel_addAF	Uncertain	0.088	D
BayesDel_noAF	Benign	-0.11
Cadd	Uncertain	25
Dann	Uncertain	1.0
DEOGEN2	Benign	0.15	T;T
Eigen	Uncertain	0.34
Eigen_PC	Uncertain	0.50
FATHMM_MKL	Uncertain	0.97	D
M_CAP	Benign	0.016	T
MetaRNN	Benign	0.33	T;T
MetaSVM	Benign	-0.48	T
MutationAssessor	Benign	1.3	L;L
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.71	T
PROVEAN	Benign	-0.43	N;N
REVEL	Uncertain	0.31
Sift	Benign	0.41	T;T
Sift4G	Benign	0.67	T;T
Polyphen		0.55	P;P
Vest4		0.57
MutPred		0.51		Gain of ubiquitination at K497 (P = 0.1278);Gain of ubiquitination at K497 (P = 0.1278);
MVP		0.72
MPC		1.3
ClinPred		0.64	D
GERP RS		6.2
Varity_R		0.14
gMVP		0.32

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: rs1064796456; hg19: chr3-176744187;