Genetic Variant NM_022492.6:c.212G>A (chr2-74490107-G-A) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_022492.6(TTC31):c.212G>A(p.Arg71Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000753 in 1,594,440 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000069 ( 0 hom. )

Consequence

TTC31
NM_022492.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.357

Publications

0 publications found

Variant links:

Genes affected

TTC31 (HGNC:25759): (tetratricopeptide repeat domain 31)

TTC31 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.09754631).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TTC31	NM_022492.6 link	c.212G>A	p.Arg71Gln	missense_variant	Exon 3 of 13	ENST00000233623.11	NP_071937.4	Q49AM3-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TTC31	ENST00000233623.11 link	c.212G>A	p.Arg71Gln	missense_variant	Exon 3 of 13	1	NM_022492.6	ENSP00000233623.6		Q49AM3-1

Frequencies

GnomAD3 genomes

AF:

0.0000132

AC:

AN:

152088

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000385

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000190

AC:

AN:

210848

AF XY:

0.0000350

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000261

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000693

AC:

AN:

1442352

Hom.:

Cov.:

AF XY:

0.00000838

AC XY:

AN XY:

715778

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33224

American (AMR)

AF:

0.00

AC:

AN:

40590

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25654

East Asian (EAS)

AF:

0.000103

AC:

AN:

38880

South Asian (SAS)

AF:

0.00

AC:

AN:

84134

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52070

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5744

European-Non Finnish (NFE)

AF:

0.00000544

AC:

AN:

1102392

Other (OTH)

AF:

0.00

AC:

AN:

59664

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.460

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000132

AC:

AN:

152088

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74288

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41422

American (AMR)

AF:

0.00

AC:

AN:

15272

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.000385

AC:

AN:

5196

South Asian (SAS)

AF:

0.00

AC:

AN:

4822

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10604

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67984

Other (OTH)

AF:

0.00

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000189

ExAC

AF:

0.00000829

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jun 09, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.212G>A (p.R71Q) alteration is located in exon 3 (coding exon 3) of the TTC31 gene. This alteration results from a G to A substitution at nucleotide position 212, causing the arginine (R) at amino acid position 71 to be replaced by a glutamine (Q). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.080

BayesDel_addAF

Benign

-0.41

BayesDel_noAF

Benign

-0.53

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.0017

.;.;T

Eigen

Benign

-0.34

Eigen_PC

Benign

-0.27

FATHMM_MKL

Benign

0.56

LIST_S2

Benign

0.72

T;T;T

M_CAP

Benign

0.010

MetaRNN

Benign

0.098

T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.2

L;.;L

PhyloP100

0.36

PrimateAI

Benign

0.28

PROVEAN

Benign

-1.3

.;N;N

REVEL

Benign

0.10

Sift

Benign

0.11

.;T;T

Sift4G

Pathogenic

0.0

D;D;D

Polyphen

0.052

.;.;B

Vest4

0.18

MutPred

0.70

Gain of helix (P = 0.0325);Gain of helix (P = 0.0325);Gain of helix (P = 0.0325);

MVP

0.52

MPC

0.098

ClinPred

0.12

GERP RS

1.4

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.032

gMVP

0.16

Mutation Taster

=95/5

polymorphism

(source)

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

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NM_022492.6:c.212G>A

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over