NM_001365276.2:c.12728G>A

Variant names:

• chr6-32041356-C-T
• NM_001365276.2:c.12728G>A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001365276.2(TNXB):​c.12728G>A​(p.Gly4243Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000127 in 788,118 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts 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. G4243V) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 23)
  • Exomes 𝑓: 0.0000013 (0 hom.)
• Consequence: TNXB NM_001365276.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.561

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]

CYP21A2 (HGNC:2600): (cytochrome P450 family 21 subfamily A member 2) This gene encodes a member of the cytochrome P450 superfamily of enzymes. The cytochrome P450 proteins are monooxygenases which catalyze many reactions involved in drug metabolism and synthesis of cholesterol, steroids and other lipids. This protein localizes to the endoplasmic reticulum and hydroxylates steroids at the 21 position. Its activity is required for the synthesis of steroid hormones including cortisol and aldosterone. Mutations in this gene cause congenital adrenal hyperplasia. A related pseudogene is located near this gene; gene conversion events involving the functional gene and the pseudogene are thought to account for many cases of steroid 21-hydroxylase deficiency. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.16196087).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TNXB	NM_001365276.2	c.12728G>A	p.Gly4243Glu	missense_variant	Exon 44 of 44	ENST00000644971.2	NP_001352205.1
CYP21A2	NM_000500.9	c.*222C>T		3_prime_UTR_variant	Exon 10 of 10	ENST00000644719.2	NP_000491.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TNXB	ENST00000644971.2	c.12728G>A	p.Gly4243Glu	missense_variant	Exon 44 of 44		NM_001365276.2	ENSP00000496448.1
CYP21A2	ENST00000644719.2	c.*222C>T		3_prime_UTR_variant	Exon 10 of 10		NM_000500.9	ENSP00000496625.1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome AF: 0.00000127 AC: 1 AN: 788118 Hom.: 0 Cov.: 11 AF XY: 0.00000244 AC XY: 1 AN XY: 409710

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000192

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 23

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.074
BayesDel_addAF	Benign	-0.086	T
BayesDel_noAF	Benign	-0.36
CADD	Benign	21
DANN	Benign	0.96
DEOGEN2	Benign	0.031	.;.;.;.;T
Eigen	Benign	-0.43
Eigen_PC	Benign	-0.64
FATHMM_MKL	Benign	0.062	N
LIST_S2	Benign	0.57	.;T;T;T;T
M_CAP	Uncertain	0.10	D
MetaRNN	Benign	0.16	T;T;T;T;T
MetaSVM	Benign	-1.0	T
PrimateAI	Uncertain	0.49	T
PROVEAN	Uncertain	-2.8	.;.;D;D;.
REVEL	Benign	0.088
Sift	Uncertain	0.013	.;.;D;D;.
Sift4G	Uncertain	0.015	.;.;D;T;D
Vest4		0.14, 0.19
MVP		0.25
MPC		2.4
ClinPred		0.31	T
GERP RS		1.6
Varity_R		0.18
gMVP		0.43

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr6-32009133;