Genetic Variant TTC32:p.Ile85Met (chr2-19897930-T-C) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001008237.3(TTC32):c.255A>G(p.Ile85Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000806 in 1,612,804 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000062 ( 0 hom. )

Consequence

TTC32
NM_001008237.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.31

Variant links:

Genes affected

TTC32 (HGNC:32954): (tetratricopeptide repeat domain 32)

TTC32 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 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
TTC32	NM_001008237.3 link	c.255A>G	p.Ile85Met	missense_variant	Exon 2 of 3	ENST00000333610.4	NP_001008238.1	Q5I0X7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
TTC32	ENST00000333610.4 link	c.255A>G	p.Ile85Met	missense_variant	Exon 2 of 3	1	NM_001008237.3	ENSP00000333018.3	Q5I0X7
TTC32	ENST00000431392.1 link	c.198A>G	p.Ile66Met	missense_variant	Exon 2 of 2	3		ENSP00000412874.1	C9JV54
TTC32	ENST00000402414.1 link	c.150-804A>G		intron_variant	Intron 1 of 1	5		ENSP00000385708.1	B5MCJ1
TTC32	ENST00000495698.1 link	n.548A>G		non_coding_transcript_exon_variant	Exon 1 of 2	2

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152240

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

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

GnomAD3 exomes

AF:

0.0000318

AC:

AN:

251356

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135872

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000232

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS 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:

1460564

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

726600

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000157

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152240

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74378

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000262

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000151

ExAC

AF:

0.0000247

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Nov 30, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.255A>G (p.I85M) alteration is located in exon 2 (coding exon 2) of the TTC32 gene. This alteration results from a A to G substitution at nucleotide position 255, causing the isoleucine (I) at amino acid position 85 to be replaced by a methionine (M). 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

0.17

BayesDel_addAF

Benign

-0.020

BayesDel_noAF

Uncertain

0.030

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.18

T;.

Eigen

Uncertain

0.22

Eigen_PC

Benign

0.10

FATHMM_MKL

Benign

0.47

LIST_S2

Benign

0.80

T;D

M_CAP

Uncertain

0.10

MetaRNN

Uncertain

0.57

D;D

MetaSVM

Uncertain

-0.19

MutationAssessor

Pathogenic

3.2

M;.

PrimateAI

Benign

0.39

PROVEAN

Uncertain

-2.5

D;N

REVEL

Uncertain

0.56

Sift

Uncertain

0.0040

D;D

Sift4G

Uncertain

0.0050

D;.

Polyphen

1.0

D;.

Vest4

0.83

MutPred

0.69

Gain of disorder (P = 0.0631);.;

MVP

0.64

MPC

0.26

ClinPred

0.81

GERP RS

1.2

Varity_R

0.53

gMVP

0.60

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over