Genetic Variant TTC31:p.Gln142Arg (chr2-74490436-A-G) – 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.425A>G(p.Gln142Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000616 in 1,461,016 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: not found (cov: 32)

Exomes 𝑓: 0.0000062 ( 0 hom. )

Consequence

TTC31
NM_022492.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.56

Publications

0 publications found

Variant links:

Genes affected

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

TTC31 links:

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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=0.17544165).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TTC31	NM_022492.6 link	c.425A>G	p.Gln142Arg	missense_variant	Exon 4 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.425A>G	p.Gln142Arg	missense_variant	Exon 4 of 13	1	NM_022492.6	ENSP00000233623.6		Q49AM3-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000811

AC:

AN:

246574

AF XY:

0.0000149

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000616

AC:

AN:

1461016

Hom.:

Cov.:

AF XY:

0.00000413

AC XY:

AN XY:

726730

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33450

American (AMR)

AF:

0.00

AC:

AN:

44554

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26110

East Asian (EAS)

AF:

0.00

AC:

AN:

39670

South Asian (SAS)

AF:

0.0000232

AC:

AN:

86062

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53388

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00000630

AC:

AN:

1111642

Other (OTH)

AF:

0.00

AC:

AN:

60372

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.469

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000113

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Apr 25, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.425A>G (p.Q142R) alteration is located in exon 4 (coding exon 4) of the TTC31 gene. This alteration results from a A to G substitution at nucleotide position 425, causing the glutamine (Q) at amino acid position 142 to be replaced by an arginine (R). 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

0.093

BayesDel_addAF

Benign

-0.22

BayesDel_noAF

Benign

-0.36

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.016

.;.;T

Eigen

Benign

0.074

Eigen_PC

Benign

0.099

FATHMM_MKL

Uncertain

0.93

LIST_S2

Benign

0.63

T;T;T

M_CAP

Benign

0.019

MetaRNN

Benign

0.18

T;T;T

MetaSVM

Benign

-0.81

MutationAssessor

Benign

1.1

L;.;L

PhyloP100

2.6

PrimateAI

Benign

0.46

PROVEAN

Benign

-2.2

.;N;N

REVEL

Benign

0.10

Sift

Pathogenic

0.0

.;D;D

Sift4G

Uncertain

0.022

D;D;D

Polyphen

0.61

.;.;P

Vest4

0.050

MutPred

0.29

Gain of MoRF binding (P = 0.0646);Gain of MoRF binding (P = 0.0646);Gain of MoRF binding (P = 0.0646);

MVP

0.76

MPC

0.13

ClinPred

0.63

GERP RS

3.6

Varity_R

0.13

gMVP

0.080

Mutation Taster

=291/9

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.030

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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2-74490436-A-G

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over