Variant 3-39109107-A-G details in Genebe, Genetics Data Aggregator

Variant summary

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

The NM_001366900.1(TTC21A):c.50A>G(p.Gln17Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,768 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (no stars).

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000027 ( 0 hom. )

Consequence

TTC21A
NM_001366900.1 missense

Scores

Clinical Significance

Uncertain significance no assertion criteria provided U:1

Conservation

PhyloP100: 1.88

Variant links:

Genes affected

TTC21A (HGNC:30761): (tetratricopeptide repeat domain 21A) Involved in flagellated sperm motility and spermatid development. Predicted to be located in cilium. Predicted to be part of intraciliary transport particle A. Implicated in spermatogenic failure 37. [provided by Alliance of Genome Resources, Apr 2022]

TTC21A links:

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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=0.08596188).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TTC21A	NM_001366900.1 linkuse as main transcript	c.50A>G	p.Gln17Arg	missense_variant	2/29	ENST00000683103.1	NP_001353829.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TTC21A	ENST00000683103.1 linkuse as main transcript	c.50A>G	p.Gln17Arg	missense_variant	2/29		NM_001366900.1	ENSP00000507739	P1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000401

AC:

AN:

249528

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135374

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000274

AC:

AN:

1461768

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

727184

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000827

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: no assertion criteria provided

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Department of Pathology and Laboratory Medicine, Sinai Health System

The TTC21A p.Gln17Arg variant was not identified in the literature nor was it identified in ClinVar. The variant was identified in dbSNP (ID: rs762980982) and in control databases in 1 of 249528 chromosomes at a frequency of 0.000004008 (Genome Aggregation Database March 6, 2019, v2.1.1). The variant was observed in the South Asian population in 1 of 30602 chromosomes (freq: 0.000033), but was not observed in the African, Latino, Ashkenazi Jewish, East Asian, European (Finnish), European (non-Finnish), or Other populations. The p.Gln17 residue is not conserved in mammals and computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) do not suggest a high likelihood of impact to the protein; however, this information is not predictive enough to rule out pathogenicity. The variant occurs outside of the splicing consensus sequence and in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer) do not predict a difference in splicing. In summary, based on the above information the clinical significance of this variant cannot be determined with certainty at this time. This variant is classified as a variant of uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.067

BayesDel_addAF

Benign

-0.14

BayesDel_noAF

Benign

-0.34

CADD

Benign

DANN

Benign

0.95

DEOGEN2

Benign

0.0054

T;.

Eigen

Benign

-0.22

Eigen_PC

Benign

-0.092

FATHMM_MKL

Uncertain

0.78

LIST_S2

Benign

0.74

T;T

M_CAP

Benign

0.018

MetaRNN

Benign

0.086

T;T

MetaSVM

Benign

-0.96

MutationAssessor

Benign

1.6

L;L

MutationTaster

Benign

0.94

N;N;N

PrimateAI

Benign

0.30

PROVEAN

Benign

-1.4

N;N

REVEL

Benign

0.13

Sift

Benign

0.54

T;T

Sift4G

Benign

0.29

T;T

Polyphen

0.48

P;B

Vest4

0.16

MutPred

0.47

Gain of glycosylation at Y14 (P = 0.0977);Gain of glycosylation at Y14 (P = 0.0977);

MVP

0.58

MPC

0.14

ClinPred

0.079

GERP RS

4.3

Varity_R

0.11

gMVP

0.35

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

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