Genetic Variant TTC34:p.Asp1057Asn (chr1-2641439-C-T) – ACMG Classification: Likely_benign (-4 pts)

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_Strong

The NM_001242672.3(TTC34):c.3169G>A(p.Asp1057Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000267 in 1,535,220 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000039 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000025 ( 0 hom. )

Consequence

TTC34
NM_001242672.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -1.37

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: Likely_benign. The variant received -4 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.027472764).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TTC34	NM_001242672.3 link	c.3169G>A	p.Asp1057Asn	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.3169G>A	p.Asp1057Asn	missense_variant	Exon 9 of 9	5	NM_001242672.3	ENSP00000383873.4		A0A1C7CYW7
TTC34	ENST00000637179.1 link	c.1630G>A	p.Asp544Asn	missense_variant	Exon 7 of 7	5		ENSP00000490537.1		A8MYJ7

Frequencies

GnomAD3 genomes

AF:

0.0000394

AC:

AN:

152122

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000724

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.000414

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000899

AC:

AN:

133452

AF XY:

0.000138

show subpopulations

Gnomad AFR exome

AF:

0.000155

Gnomad AMR exome

AF:

0.0000410

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000286

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000192

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000253

AC:

AN:

1382980

Hom.:

Cov.:

AF XY:

0.0000410

AC XY:

AN XY:

682386

show subpopulations

African (AFR)

AF:

0.0000317

AC:

AN:

31588

American (AMR)

AF:

0.0000281

AC:

AN:

35632

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25114

East Asian (EAS)

AF:

0.0000280

AC:

AN:

35730

South Asian (SAS)

AF:

0.000278

AC:

AN:

79148

European-Finnish (FIN)

AF:

0.00

AC:

AN:

33806

Middle Eastern (MID)

AF:

0.000176

AC:

AN:

5670

European-Non Finnish (NFE)

AF:

0.00000742

AC:

AN:

1078448

Other (OTH)

AF:

0.0000173

AC:

AN:

57844

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.514

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000394

AC:

AN:

152240

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74450

show subpopulations

African (AFR)

AF:

0.0000722

AC:

AN:

41530

American (AMR)

AF:

0.00

AC:

AN:

15304

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.000193

AC:

AN:

5176

South Asian (SAS)

AF:

0.000414

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10624

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67988

Other (OTH)

AF:

0.00

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.417

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000416

ExAC

AF:

0.000216

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jan 22, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.1630G>A (p.D544N) alteration is located in exon 7 (coding exon 7) of the TTC34 gene. This alteration results from a G to A substitution at nucleotide position 1630, causing the aspartic acid (D) at amino acid position 544 to be replaced by an asparagine (N). 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

0.075

BayesDel_addAF

Benign

-0.60

BayesDel_noAF

Benign

-0.80

CADD

Benign

0.048

(source)

DANN

Benign

0.85

DEOGEN2

Benign

0.0022

.;T

Eigen

Benign

-1.2

Eigen_PC

Benign

-1.2

FATHMM_MKL

Benign

0.021

LIST_S2

Benign

0.43

T;.

M_CAP

Benign

0.011

MetaRNN

Benign

0.027

T;T

MetaSVM

Benign

-0.99

MutationAssessor

Benign

-0.20

.;N

PhyloP100

-1.4

PrimateAI

Benign

0.45

REVEL

Benign

0.013

MutPred

0.26

.;Gain of MoRF binding (P = 0.0454);

MVP

0.067

ClinPred

0.012

GERP RS

-0.69

Varity_R

0.032

gMVP

0.065

Mutation Taster

=98/2

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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1-2641439-C-T

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