rs863223405

Variant names:

• chr14-24258324-A-G
• rs863223405
• NM_000359.3:c.1363T>C

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM2 PP3_Strong PP5_Moderate

The NM_000359.3(TGM1):​c.1363T>C​(p.Trp455Arg) 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 pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: TGM1 NM_000359.3 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:3
• Conservation: PhyloP100: 7.50

Genes affected

TGM1 (HGNC:11777): (transglutaminase 1) The protein encoded by this gene is a membrane protein that catalyzes the addition of an alkyl group from an akylamine to a glutamine residue of a protein, forming an alkylglutamine in the protein. This protein alkylation leads to crosslinking of proteins and catenation of polyamines to proteins. This gene contains either one or two copies of a 22 nt repeat unit in its 3' UTR. Mutations in this gene have been associated with autosomal recessive lamellar ichthyosis (LI) and nonbullous congenital ichthyosiform erythroderma (NCIE). [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.995
• PP5: Variant 14-24258324-A-G is Pathogenic according to our data. Variant chr14-24258324-A-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 217304.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TGM1	NM_000359.3	c.1363T>C	p.Trp455Arg	missense_variant	Exon 9 of 15	ENST00000206765.11	NP_000350.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TGM1	ENST00000206765.11	c.1363T>C	p.Trp455Arg	missense_variant	Exon 9 of 15	1	NM_000359.3	ENSP00000206765.6
TGM1	ENST00000544573.5	c.37T>C	p.Trp13Arg	missense_variant	Exon 3 of 9	2		ENSP00000439446.1
TGM1	ENST00000559136.1	c.436T>C	p.Trp146Arg	missense_variant	Exon 5 of 7	5		ENSP00000453337.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, single submitter

Submissions by phenotype

Autosomal recessive congenital ichthyosis 1 Pathogenic:2

May 20, 2020

Foundation for Research in Genetics and Endocrinology, FRIGE's Institute of Human Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

A homozygous missense variation in exon 9 of the TGM1 gene that results in the amino acid substitution of Arginine for Tryptophan at codon 455 was detected. The observed variant c.1363T>C (p.Trp455Arg) has not been reported in the 1000 genomes and ExAC databases. The observed variation lies in the transglutaminase-like superfamily domain of the TGM1 protein and has previously been reported in patients affected with congenital ichthyosis (Ullah, Rahim et al. 2016). The in silico prediction of the variant are probably damaging by PolyPhen-2 (HumDiv) and damaging by SIFT, LRT and MutationTaster2. The reference codon is conserved across species. In summary, the variant meets our criteria to be classified as likely pathogenic. -

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Department of Molecular and Human Genetics, Baylor College of Medicine

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: research

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Ichthyosis Pathogenic:1

Nov 17, 2015

University of Washington Center for Mendelian Genomics, University of Washington

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: research

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.58
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.98	D;.;D
Eigen	Pathogenic	0.88
Eigen_PC	Pathogenic	0.77
FATHMM_MKL	Pathogenic	0.98	D
M_CAP	Pathogenic	0.75	D
MetaRNN	Pathogenic	0.99	D;D;D
MetaSVM	Pathogenic	0.91	D
MutationAssessor	Pathogenic	3.7	H;.;.
PrimateAI	Uncertain	0.69	T
PROVEAN	Pathogenic	-14	D;D;D
REVEL	Pathogenic	0.95
Sift	Pathogenic	0.0	D;D;D
Sift4G	Pathogenic	0.0	D;D;.
Polyphen		1.0	D;.;.
Vest4		0.96
MutPred		0.95		Gain of disorder (P = 0.0094);.;.;
MVP		1.0
MPC		1.2
ClinPred		1.0	D
GERP RS		4.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.97
gMVP		0.97

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: rs863223405; hg19: chr14-24727530;