rs142832802

chr20-2403418-G-Achr20-2403418-G-C

Variant summary

Our verdict is Benign. Variant got -15 ACMG points: 0P and 15B. BP4_Moderate BP6_Very_Strong BP7 BS2

The NM_198994.3(TGM6):c.1011G>A(p.Glu337=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000504 in 1,614,172 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.00058 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00050 (0 hom.)
• Consequence: TGM6 NM_198994.3 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:4
• Conservation: PhyloP100: 1.02

Genes affected

TGM6 (HGNC:16255): (transglutaminase 6) The protein encoded by this gene belongs to the transglutaminase superfamily. It catalyzes the cross-linking of proteins and the conjugation of polyamines to proteins. Mutations in this gene are associated with spinocerebellar ataxia type 35 (SCA35). Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Dec 2011]

ACMG classification

Verdict is Benign. Variant got -15 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.4).
• BP6: Variant 20-2403418-G-A is Benign according to our data. Variant chr20-2403418-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 448663.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=1.02 with no splicing effect.
• BS2: High AC in GnomAd at 89 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TGM6	NM_198994.3	c.1011G>A	p.Glu337=	synonymous_variant	8/13	ENST00000202625.7
TGM6	NM_001254734.2	c.1011G>A	p.Glu337=	synonymous_variant	8/12

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TGM6	ENST00000202625.7	c.1011G>A	p.Glu337=	synonymous_variant	8/13	1	NM_198994.3	P1
TGM6	ENST00000381423.1	c.1011G>A	p.Glu337=	synonymous_variant	8/12	1

Frequencies

GnomAD3 genomes AF: 0.000585 AC: 89 AN: 152170 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000724

Gnomad AMI AF: 0.0307

Gnomad AMR AF: 0.000262

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.0000942

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000764

Gnomad OTH AF: 0.000479

GnomAD3 exomes AF: 0.000382 AC: 96 AN: 251414 Hom.: 0 AF XY: 0.000456 AC XY: 62 AN XY: 135906

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000260

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.0000462

Gnomad NFE exome AF: 0.000739

Gnomad OTH exome AF: 0.000326

GnomAD4 exome AF: 0.000495 AC: 724 AN: 1461884 Hom.: 0 Cov.: 32 AF XY: 0.000477 AC XY: 347 AN XY: 727242

Gnomad4 AFR exome AF: 0.0000896

Gnomad4 AMR exome AF: 0.000291

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.0000187

Gnomad4 NFE exome AF: 0.000618

Gnomad4 OTH exome AF: 0.000331

GnomAD4 genome AF: 0.000584 AC: 89 AN: 152288 Hom.: 0 Cov.: 32 AF XY: 0.000604 AC XY: 45 AN XY: 74464

Gnomad4 AFR AF: 0.0000722

Gnomad4 AMR AF: 0.000261

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.0000942

Gnomad4 NFE AF: 0.000764

Gnomad4 OTH AF: 0.000474

Alfa AF: 0.000564 Hom.: 0

Bravo AF: 0.000718

EpiCase AF: 0.000818

EpiControl AF: 0.00124

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Sep 01, 2021	- -
Likely benign, criteria provided, single submitter	clinical testing	Invitae	Sep 04, 2023	- -

not specified Benign:1

Benign, criteria provided, single submitter

clinical testing

Athena Diagnostics

Apr 06, 2017

- -

Spinocerebellar ataxia type 35 Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.40
Cadd	Benign	6.2
Dann	Benign	0.64

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: rs142832802; hg19: chr20-2384064;