Genetic Variant TTC31:p.Arg51Gly (chr2-74490046-C-G) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_022492.6(TTC31):c.151C>G(p.Arg51Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000192 in 1,559,964 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 Uncertain significance (★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

TTC31
NM_022492.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.327

Publications

1 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 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TTC31	NM_022492.6 link	c.151C>G	p.Arg51Gly	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.151C>G	p.Arg51Gly	missense_variant	Exon 3 of 13	1	NM_022492.6	ENSP00000233623.6		Q49AM3-1

Frequencies

GnomAD3 genomes

AF:

0.00000659

AC:

AN:

151664

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000656

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000112

AC:

AN:

177980

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000765

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:

0.00000142

AC:

AN:

1408300

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

695958

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

32356

American (AMR)

AF:

0.0000543

AC:

AN:

36822

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25034

East Asian (EAS)

AF:

0.00

AC:

AN:

37252

South Asian (SAS)

AF:

0.00

AC:

AN:

80724

European-Finnish (FIN)

AF:

0.00

AC:

AN:

49744

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5636

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1082570

Other (OTH)

AF:

0.00

AC:

AN:

58162

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.450

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.00000659

AC:

AN:

151664

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74062

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41298

American (AMR)

AF:

0.0000656

AC:

AN:

15254

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3466

East Asian (EAS)

AF:

0.00

AC:

AN:

5154

South Asian (SAS)

AF:

0.00

AC:

AN:

4776

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10484

Middle Eastern (MID)

AF:

0.00

AC:

AN:

314

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67924

Other (OTH)

AF:

0.00

AC:

AN:

2082

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:

0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Apr 24, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.151C>G (p.R51G) alteration is located in exon 3 (coding exon 3) of the TTC31 gene. This alteration results from a C to G substitution at nucleotide position 151, causing the arginine (R) at amino acid position 51 to be replaced by a glycine (G). 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

0.13

BayesDel_addAF

Benign

-0.22

BayesDel_noAF

Benign

-0.37

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.013

.;.;T

Eigen

Benign

-0.54

Eigen_PC

Benign

-0.68

FATHMM_MKL

Benign

0.078

LIST_S2

Benign

0.76

T;T;T

M_CAP

Benign

0.0039

MetaRNN

Benign

0.13

T;T;T

MetaSVM

Benign

-0.99

MutationAssessor

Benign

1.8

L;.;L

PhyloP100

-0.33

PrimateAI

Benign

0.28

PROVEAN

Uncertain

-3.2

.;D;N

REVEL

Benign

0.068

Sift

Uncertain

0.0080

.;D;D

Sift4G

Pathogenic

0.0

D;D;D

Polyphen

0.65

.;.;P

Vest4

0.46

MutPred

0.36

Loss of helix (P = 0.028);Loss of helix (P = 0.028);Loss of helix (P = 0.028);

MVP

0.59

MPC

0.28

ClinPred

0.58

GERP RS

-0.62

Varity_R

0.19

gMVP

0.38

Mutation Taster

=99/1

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.22

Details are displayed if max score is > 0.2

DS_AL_spliceai

0.22

Position offset: -21

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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chr2-74490046-C-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