1-54787801-C-T

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_001114108.2(TTC22):c.649G>A(p.Gly217Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,459,518 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G217D) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

TTC22
NM_001114108.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.81

Publications

0 publications found

Variant links:

Genes affected

TTC22 (HGNC:26067): (tetratricopeptide repeat domain 22) This gene encodes a protein with seven tetratricopeptide (TPR) repeats. Tetratricopeptide repeat containing motifs are found in a variety of proteins and may mediate protein-protein interactions and chaperone activity. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Jun 2011]

TTC22 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=0.10004854).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TTC22	NM_001114108.2 link	c.649G>A	p.Gly217Ser	missense_variant	Exon 3 of 7	ENST00000371276.9	NP_001107580.1	Q5TAA0-1
TTC22	NM_017904.4 link	c.649G>A	p.Gly217Ser	missense_variant	Exon 3 of 6		NP_060374.2	Q5TAA0-2
TTC22	XM_011541671.3 link	c.649G>A	p.Gly217Ser	missense_variant	Exon 3 of 6		XP_011539973.1
TTC22	XM_017001582.2 link	c.76G>A	p.Gly26Ser	missense_variant	Exon 3 of 7		XP_016857071.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TTC22	ENST00000371276.9 link	c.649G>A	p.Gly217Ser	missense_variant	Exon 3 of 7	5	NM_001114108.2	ENSP00000360323.4		Q5TAA0-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000406

AC:

AN:

246224

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000551

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1459518

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

725876

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33408

American (AMR)

AF:

0.00

AC:

AN:

44446

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26042

East Asian (EAS)

AF:

0.0000253

AC:

AN:

39572

South Asian (SAS)

AF:

0.00

AC:

AN:

85826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53212

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1110994

Other (OTH)

AF:

0.00

AC:

AN:

60252

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Aug 08, 2023

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.649G>A (p.G217S) alteration is located in exon 3 (coding exon 3) of the TTC22 gene. This alteration results from a G to A substitution at nucleotide position 649, causing the glycine (G) at amino acid position 217 to be replaced by a serine (S). 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

0.14

BayesDel_addAF

Benign

-0.11

BayesDel_noAF

Benign

-0.39

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.0080

T;.

Eigen

Benign

-0.25

Eigen_PC

Benign

-0.058

FATHMM_MKL

Uncertain

0.83

LIST_S2

Benign

0.81

T;T

M_CAP

Benign

0.0057

MetaRNN

Benign

0.10

T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.5

L;L

PhyloP100

2.8

PrimateAI

Benign

0.43

PROVEAN

Benign

-0.32

N;N

REVEL

Benign

0.066

Sift

Benign

0.56

T;T

Sift4G

Benign

0.79

T;T

Polyphen

0.030

B;B

Vest4

0.24

MutPred

0.25

Gain of sheet (P = 0.0344);Gain of sheet (P = 0.0344);

MVP

0.27

MPC

0.29

ClinPred

0.27

GERP RS

4.5

PromoterAI

0.018

Neutral

(source)

Varity_R

0.15

gMVP

0.54

Mutation Taster

=71/29

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

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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1-54787801-C-T

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