20-2395392-G-C

Variant names:

• chr20-2395392-G-C
• rs146964822
• NM_198994.3:c.380G>C

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 0P and 1B. BS2_Supporting

The NM_198994.3(TGM6):​c.380G>C​(p.Arg127Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000242 in 1,614,120 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. R127Q) has been classified as Benign.

• Frequency:
  • Genomes: 𝑓 0.000020 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000025 (0 hom.)
• Consequence: TGM6 NM_198994.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.130
• Publications: 2 publications found

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]

TGM6 Gene-Disease associations (from GenCC):

• spinocerebellar ataxia type 35

  Inheritance: AD Classification: STRONG, MODERATE, SUPPORTIVE, LIMITED Submitted by: Ambry Genetics, Illumina, Labcorp Genetics (formerly Invitae), Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -1 ACMG points.

• BS2: High AC in GnomAdExome4 at 36 AD gene. Variant has AC lower than other variant known as pathogenic in the gene, so the strength is limited to Supporting.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_198994.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TGM6	NM_198994.3	MANE Select	c.380G>C	p.Arg127Pro	missense	Exon 3 of 13	NP_945345.2
	TGM6	NM_001254734.2		c.380G>C	p.Arg127Pro	missense	Exon 3 of 12	NP_001241663.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TGM6	ENST00000202625.7	TSL:1 MANE Select	c.380G>C	p.Arg127Pro	missense	Exon 3 of 13	ENSP00000202625.2
	TGM6	ENST00000381423.1	TSL:1	c.380G>C	p.Arg127Pro	missense	Exon 3 of 12	ENSP00000370831.1
	TGM6	ENST00000477505.1	TSL:5	n.174+767G>C		intron	N/A

Frequencies

GnomAD3 genomes AF: 0.0000197 AC: 3 AN: 152226 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000441

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000199 AC: 5 AN: 251492 AF XY: 0.0000368

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000439

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000246 AC: 36 AN: 1461894 Hom.: 0 Cov.: 31 AF XY: 0.0000330 AC XY: 24 AN XY: 727248

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.0000324 AC: 36 AN: 1112012

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome AF: 0.0000197 AC: 3 AN: 152226 Hom.: 0 Cov.: 32 AF XY: 0.0000134 AC XY: 1 AN XY: 74360

African (AFR) AF: 0.00 AC: 0 AN: 41460

American (AMR) AF: 0.00 AC: 0 AN: 15282

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5200

South Asian (SAS) AF: 0.00 AC: 0 AN: 4830

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10620

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000441 AC: 3 AN: 68044

Other (OTH) AF: 0.00 AC: 0 AN: 2092

Alfa AF: 0.0000427 Hom.: 0

Bravo AF: 0.0000151

ExAC AF: 0.0000330 AC: 4

EpiCase AF: 0.000109

EpiControl AF: 0.00

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.43
BayesDel_addAF	Benign	-0.075	T
BayesDel_noAF	Benign	-0.21
CADD	Benign	17
DANN	Uncertain	0.99
DEOGEN2	Benign	0.0048	T
Eigen	Benign	-0.32
Eigen_PC	Benign	-0.34
FATHMM_MKL	Benign	0.048	N
LIST_S2	Benign	0.65	T
M_CAP	Uncertain	0.089	D
MetaRNN	Uncertain	0.45	T
MetaSVM	Benign	-0.63	T
MutationAssessor	Benign	0.55	N
PhyloP100		0.13
PrimateAI	Benign	0.30	T
PROVEAN	Benign	-2.0	N
REVEL	Uncertain	0.47
Sift	Benign	0.16	T
Sift4G	Benign	0.24	T
Polyphen		0.49	P
Vest4		0.62
MutPred		0.44		Loss of MoRF binding (P = 0.0034)
MVP		0.67
MPC		0.33
ClinPred		0.55	D
GERP RS		2.2
Varity_R		0.27
gMVP		0.70
Mutation Taster		=70/30	polymorphism

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

Other links and lift over

dbSNP: rs146964822; hg19: chr20-2376038;