Genetic Variant TTC34:p.Ala994Val (chr1-2641627-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_001242672.3(TTC34):c.2981C>T(p.Ala994Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000248 in 1,534,692 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000025 ( 1 hom. )

Consequence

TTC34
NM_001242672.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.0390

Publications

0 publications found

Variant links:

Genes affected

TTC34 (HGNC:34297): (tetratricopeptide repeat domain 34)

TTC34 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=0.0879074).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TTC34	NM_001242672.3 link	c.2981C>T	p.Ala994Val	missense_variant	Exon 9 of 9	ENST00000401095.9	NP_001229601.2	A8MYJ7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TTC34	ENST00000401095.9 link	c.2981C>T	p.Ala994Val	missense_variant	Exon 9 of 9	5	NM_001242672.3	ENSP00000383873.4		A0A1C7CYW7
TTC34	ENST00000637179.1 link	c.1442C>T	p.Ala481Val	missense_variant	Exon 7 of 7	5		ENSP00000490537.1		A8MYJ7

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152172

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000532

AC:

AN:

131652

AF XY:

0.0000557

show subpopulations

Gnomad AFR exome

AF:

0.000159

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:

0.000119

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000246

AC:

AN:

1382520

Hom.:

Cov.:

AF XY:

0.0000264

AC XY:

AN XY:

682124

show subpopulations

African (AFR)

AF:

0.0000634

AC:

AN:

31556

American (AMR)

AF:

0.00

AC:

AN:

35640

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25136

East Asian (EAS)

AF:

0.00

AC:

AN:

35726

South Asian (SAS)

AF:

0.00

AC:

AN:

79128

European-Finnish (FIN)

AF:

0.00

AC:

AN:

33584

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5444

European-Non Finnish (NFE)

AF:

0.0000287

AC:

AN:

1078476

Other (OTH)

AF:

0.0000173

AC:

AN:

57830

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.497

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152172

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74332

show subpopulations

African (AFR)

AF:

0.0000483

AC:

AN:

41438

American (AMR)

AF:

0.0000654

AC:

AN:

15288

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5190

South Asian (SAS)

AF:

0.00

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10624

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

68014

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.500

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.0000868

Hom.:

Bravo

AF:

0.0000302

ExAC

AF:

0.0000552

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jun 07, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.1442C>T (p.A481V) alteration is located in exon 7 (coding exon 7) of the TTC34 gene. This alteration results from a C to T substitution at nucleotide position 1442, causing the alanine (A) at amino acid position 481 to be replaced by a valine (V). 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

0.085

BayesDel_addAF

Benign

-0.43

BayesDel_noAF

Benign

-0.59

CADD

Benign

(source)

DANN

Benign

0.94

DEOGEN2

Benign

0.013

.;T

Eigen

Benign

-0.52

Eigen_PC

Benign

-0.68

FATHMM_MKL

Benign

0.074

LIST_S2

Benign

0.59

T;.

M_CAP

Benign

0.023

MetaRNN

Benign

0.088

T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.4

.;L

PhyloP100

-0.039

PrimateAI

Uncertain

0.51

REVEL

Benign

0.021

MutPred

0.42

.;Loss of disorder (P = 0.0384);

MVP

0.076

ClinPred

0.016

GERP RS

1.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.8

Varity_R

0.033

gMVP

0.11

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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1-2641627-G-A

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