6-32084536-C-G

Variant names:

• chr6-32084536-C-G
• rs121912575
• NM_001365276.2:c.3322G>C

Variant summary

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

The NM_001365276.2(TNXB):​c.3322G>C​(p.Val1108Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 11/19 in silico tools predict a benign 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. V1108M) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TNXB NM_001365276.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.652
• Publications: 0 publications found

Genes affected

TNXB (HGNC:11976): (tenascin XB) This gene encodes a member of the tenascin family of extracellular matrix glycoproteins. The tenascins have anti-adhesive effects, as opposed to fibronectin which is adhesive. This protein is thought to function in matrix maturation during wound healing, and its deficiency has been associated with the connective tissue disorder Ehlers-Danlos syndrome. This gene localizes to the major histocompatibility complex (MHC) class III region on chromosome 6. It is one of four genes in this cluster which have been duplicated. The duplicated copy of this gene is incomplete and is a pseudogene which is transcribed but does not encode a protein. The structure of this gene is unusual in that it overlaps the CREBL1 and CYP21A2 genes at its 5' and 3' ends, respectively. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

TNXB Gene-Disease associations (from GenCC):

• Ehlers-Danlos syndrome

  Inheritance: AR Classification: DEFINITIVE Submitted by: G2P
• Ehlers-Danlos syndrome due to tenascin-X deficiency

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Illumina, PanelApp Australia, Orphanet
• familial vesicoureteral reflux

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• vesicoureteral reflux 8

  Inheritance: AD Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

ENSG00000294466 (HGNC:):

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
TNXB	NM_001365276.2	c.3322G>C	p.Val1108Leu	missense_variant	Exon 8 of 44	ENST00000644971.2	NP_001352205.1
TNXB	NM_001428335.1	c.4063G>C	p.Val1355Leu	missense_variant	Exon 9 of 45		NP_001415264.1
TNXB	NM_019105.8	c.3322G>C	p.Val1108Leu	missense_variant	Exon 8 of 44		NP_061978.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TNXB	ENST00000644971.2	c.3322G>C	p.Val1108Leu	missense_variant	Exon 8 of 44		NM_001365276.2	ENSP00000496448.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.30
BayesDel_addAF	Benign	-0.083	T
BayesDel_noAF	Benign	-0.36
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Benign	0.073	T;.;T;.
Eigen	Uncertain	0.36
Eigen_PC	Uncertain	0.25
FATHMM_MKL	Benign	0.60	D
LIST_S2	Benign	0.0	.;T;T;D
M_CAP	Benign	0.015	T
MetaRNN	Uncertain	0.51	D;D;D;D
MetaSVM	Benign	-0.84	T
MutationAssessor	Benign	0.0	.;.;.;.
PhyloP100		0.65
PrimateAI	Benign	0.43	T
PROVEAN	Benign	0.0	.;.;N;.
REVEL	Benign	0.0
Sift	Pathogenic	0.0	.;.;T;.
Sift4G	Pathogenic	0.0	.;.;T;D
Vest4		0.0
ClinPred		0.92	D
GERP RS		4.1
Varity_R		0.19
Mutation Taster		=94/6	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

dbSNP: rs121912575; hg19: chr6-32052313;