Genetic Variant TTC22:p.Ala334Glu (chr1-54786002-G-T) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001114108.2(TTC22):c.1001C>A(p.Ala334Glu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,316 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A334V) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

TTC22
NM_001114108.2 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 8.72

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:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 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
TTC22	NM_001114108.2 link	c.1001C>A	p.Ala334Glu	missense_variant	Exon 5 of 7	ENST00000371276.9	NP_001107580.1	Q5TAA0-1
TTC22	NM_017904.4 link	c.1001C>A	p.Ala334Glu	missense_variant	Exon 5 of 6		NP_060374.2	Q5TAA0-2
TTC22	XM_011541671.3 link	c.1001C>A	p.Ala334Glu	missense_variant	Exon 5 of 6		XP_011539973.1
TTC22	XM_017001582.2 link	c.428C>A	p.Ala143Glu	missense_variant	Exon 5 of 7		XP_016857071.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
TTC22	ENST00000371276.9 link	c.1001C>A	p.Ala334Glu	missense_variant	Exon 5 of 7	5	NM_001114108.2	ENSP00000360323.4	Q5TAA0-1
TTC22	ENST00000371274.8 link	c.1001C>A	p.Ala334Glu	missense_variant	Exon 5 of 6	2		ENSP00000360321.4	Q5TAA0-2
TTC22	ENST00000448308.2 link	c.344C>A	p.Ala115Glu	missense_variant	Exon 3 of 4	3		ENSP00000390300.2	H0Y486
TTC22	ENST00000488771.1 link	n.1994C>A		non_coding_transcript_exon_variant	Exon 1 of 3	2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1460316

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726448

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33468

American (AMR)

AF:

0.00

AC:

AN:

44650

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26106

East Asian (EAS)

AF:

0.00

AC:

AN:

39660

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86204

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52606

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5700

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111702

Other (OTH)

AF:

0.00

AC:

AN:

60220

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.93

BayesDel_addAF

Pathogenic

0.24

BayesDel_noAF

Uncertain

0.11

CADD

Pathogenic

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.19

T;.;.

Eigen

Uncertain

0.61

Eigen_PC

Uncertain

0.60

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Benign

0.81

T;T;D

M_CAP

Uncertain

0.11

MetaRNN

Uncertain

0.63

D;D;D

MetaSVM

Uncertain

0.19

MutationAssessor

Uncertain

2.2

M;M;.

PhyloP100

8.7

PrimateAI

Uncertain

0.51

PROVEAN

Uncertain

-4.2

D;N;D

REVEL

Uncertain

0.47

Sift

Uncertain

0.0030

D;D;D

Sift4G

Uncertain

0.0060

D;D;D

Polyphen

1.0

D;D;.

Vest4

0.90

MutPred

0.39

Gain of solvent accessibility (P = 0.0145);Gain of solvent accessibility (P = 0.0145);.;

MVP

0.81

MPC

1.1

ClinPred

0.99

GERP RS

4.2

Varity_R

0.75

gMVP

0.88

Mutation Taster

=36/64

disease causing

(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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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over