14-24260481-C-G

Variant names:

• chr14-24260481-C-G
• rs35755034
• NM_000359.3:c.726G>C

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_000359.3(TGM1):​c.726G>C​(p.Glu242Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. E242E) has been classified as Benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: TGM1 NM_000359.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.133
• Publications: 9 publications found

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]

TGM1 Gene-Disease associations (from GenCC):

• autosomal recessive congenital ichthyosis 1

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae), Myriad Women’s Health, PanelApp Australia, Genomics England PanelApp
• acral self-healing collodion baby

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• bathing suit ichthyosis

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• congenital non-bullous ichthyosiform erythroderma

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• lamellar ichthyosis

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• self-healing collodion baby

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 81 curated pathogenic missense variants (we use a threshold of 10). The gene has 20 curated benign missense variants. Gene score misZ: -0.060191 (below the threshold of 3.09). Trascript score misZ: 1.7514 (below the threshold of 3.09). GenCC associations: The gene is linked to autosomal recessive congenital ichthyosis 1, acral self-healing collodion baby, bathing suit ichthyosis, congenital non-bullous ichthyosiform erythroderma, lamellar ichthyosis, self-healing collodion baby.
• BP4: Computational evidence support a benign effect (MetaRNN=0.08876836).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TGM1	NM_000359.3	c.726G>C	p.Glu242Asp	missense_variant	Exon 4 of 15	ENST00000206765.11	NP_000350.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TGM1	ENST00000206765.11	c.726G>C	p.Glu242Asp	missense_variant	Exon 4 of 15	1	NM_000359.3	ENSP00000206765.6
TGM1	ENST00000544573.5	c.-29+1646G>C		intron_variant	Intron 2 of 8	2		ENSP00000439446.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.24
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.42
CADD	Benign	12
DANN	Uncertain	0.98
DEOGEN2	Benign	0.21	T
Eigen	Benign	-0.72
Eigen_PC	Benign	-0.44
FATHMM_MKL	Benign	0.59	D
M_CAP	Benign	0.022	T
MetaRNN	Benign	0.089	T
MetaSVM	Benign	-0.86	T
MutationAssessor	Benign	-0.75	N
PhyloP100		0.13
PrimateAI	Uncertain	0.50	T
PROVEAN	Benign	1.6	N
REVEL	Benign	0.23
Sift	Benign	1.0	T
Sift4G	Benign	1.0	T
Polyphen		0.041	B
Vest4		0.27
MutPred		0.48		Loss of sheet (P = 0.1158);
MVP		0.56
MPC		0.77
ClinPred		0.82	D
GERP RS		3.6
PromoterAI		0.032	Neutral
Varity_R		0.098
gMVP		0.39
Mutation Taster		=89/11	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: rs35755034; hg19: chr14-24729687;