1-54731621-A-G

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_004623.5(TTC4):c.817A>G(p.Arg273Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000372 in 1,614,008 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 31)

Exomes 𝑓: 0.0000034 ( 0 hom. )

Consequence

TTC4
NM_004623.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.03

Variant links:

Genes affected

TTC4 (HGNC:12394): (tetratricopeptide repeat domain 4) This gene encodes a protein that contains tetratricopeptide (TPR) repeats, which often mediate protein-protein interactions and chaperone activity. The encoded protein interacts with heat shock proteins 70 and 90. Alternative splicing results in multiple transcript variants. Naturally-occuring readthrough transcription occurs from upstream gene MROH (maestro heat-like repeat family member 7) to this gene. [provided by RefSeq, Apr 2014]

TTC4 links:

MROH7-TTC4 (HGNC:49180): (MROH7-TTC4 readthrough (NMD candidate)) This locus represents naturally occurring read-through transcription between the neighboring MROH7 (maestro heat-like repeat family member 7) and TTC4 (tetratricopeptide repeat domain 4) genes. Alternative splicing results in multiple transcript variants, which are candidates for nonsense-mediated mRNA decay (NMD) and are unlikely to produce protein products. [provided by RefSeq, Aug 2013]

MROH7-TTC4 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.24911663).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TTC4	NM_004623.5 link	c.817A>G	p.Arg273Gly	missense_variant	Exon 7 of 10	ENST00000371281.4	NP_004614.3	O95801

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
TTC4	ENST00000371281.4 link	c.817A>G	p.Arg273Gly	missense_variant	Exon 7 of 10	1	NM_004623.5	ENSP00000360329.3	O95801
MROH7-TTC4	ENST00000414150.6 link	n.*519A>G		non_coding_transcript_exon_variant	Exon 30 of 33	2		ENSP00000410192.2	A0A0A0MT08
MROH7-TTC4	ENST00000414150.6 link	n.*519A>G		3_prime_UTR_variant	Exon 30 of 33	2		ENSP00000410192.2	A0A0A0MT08

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152162

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000342

AC:

AN:

1461846

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727216

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000447

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:

0.00000180

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152162

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74342

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000654

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:

0.0000340

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Nov 03, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.817A>G (p.R273G) alteration is located in exon 7 (coding exon 7) of the TTC4 gene. This alteration results from a A to G substitution at nucleotide position 817, causing the arginine (R) at amino acid position 273 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

-0.044

BayesDel_noAF

Benign

-0.30

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Benign

0.0096

Eigen

Benign

-0.12

Eigen_PC

Benign

-0.095

FATHMM_MKL

Benign

0.74

LIST_S2

Uncertain

0.90

M_CAP

Benign

0.0081

MetaRNN

Benign

0.25

MetaSVM

Benign

-1.0

MutationAssessor

Uncertain

2.2

PrimateAI

Benign

0.32

PROVEAN

Benign

-2.3

REVEL

Benign

0.15

Sift

Benign

0.21

Sift4G

Benign

0.10

Polyphen

0.75

Vest4

0.53

MVP

0.43

MPC

0.061

ClinPred

0.31

GERP RS

0.86

Varity_R

0.24

gMVP

0.43

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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