rs6755258

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBP6BS1

The NM_020458.4(TTC7A):c.1633G>A(p.Val545Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000145 in 1,605,468 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. V545V) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00065 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000092 ( 0 hom. )

Consequence

TTC7A
NM_020458.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:1

Conservation

PhyloP100: 0.604

Publications

5 publications found

Variant links:

Genes affected

TTC7A (HGNC:19750): (tetratricopeptide repeat domain 7A) This gene encodes a protein containing tetratricopeptide repeats. Mutations in this gene disrupt intestinal development and can cause early onset inflammatory bowel disease and intestinal atresia. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jun 2014]

TTC7A Gene-Disease associations (from GenCC):

gastrointestinal defects and immunodeficiency syndrome 1
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
multiple intestinal atresia
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, ClinGen, Ambry Genetics

TTC7A links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.00999558).

BP6

Variant 2-47024351-G-A is Benign according to our data. Variant chr2-47024351-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 528460.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.000651 (99/152190) while in subpopulation AFR AF = 0.00222 (92/41512). AF 95% confidence interval is 0.00185. There are 0 homozygotes in GnomAd4. There are 43 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TTC7A	NM_020458.4 link	c.1633G>A	p.Val545Ile	missense_variant	Exon 14 of 20	ENST00000319190.11	NP_065191.2	Q9ULT0-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TTC7A	ENST00000319190.11 link	c.1633G>A	p.Val545Ile	missense_variant	Exon 14 of 20	2	NM_020458.4	ENSP00000316699.5		Q9ULT0-1

Frequencies

GnomAD3 genomes

AF:

0.000651

AC:

AN:

152072

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00222

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000196

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:

0.0000441

Gnomad OTH

AF:

0.000478

GnomAD2 exomes

AF:

0.000216

AC:

AN:

240204

AF XY:

0.000131

show subpopulations

Gnomad AFR exome

AF:

0.00274

Gnomad AMR exome

AF:

0.0000611

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000457

Gnomad OTH exome

AF:

0.000175

GnomAD4 exome

AF:

0.0000922

AC:

134

AN:

1453278

Hom.:

Cov.:

AF XY:

0.0000886

AC XY:

AN XY:

722752

show subpopulations

African (AFR)

AF:

0.00246

AC:

AN:

32898

American (AMR)

AF:

0.0000456

AC:

AN:

43880

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25900

East Asian (EAS)

AF:

0.0000523

AC:

AN:

38268

South Asian (SAS)

AF:

0.0000823

AC:

AN:

85022

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53308

Middle Eastern (MID)

AF:

0.000174

AC:

AN:

5752

European-Non Finnish (NFE)

AF:

0.0000280

AC:

AN:

1108198

Other (OTH)

AF:

0.000167

AC:

AN:

60052

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.466

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000651

AC:

AN:

152190

Hom.:

Cov.:

AF XY:

0.000578

AC XY:

AN XY:

74404

show subpopulations

African (AFR)

AF:

0.00222

AC:

AN:

41512

American (AMR)

AF:

0.000196

AC:

AN:

15302

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5172

South Asian (SAS)

AF:

0.00

AC:

AN:

4820

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10606

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000441

AC:

AN:

67990

Other (OTH)

AF:

0.000473

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.497

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000324

Hom.:

Bravo

AF:

0.000710

ESP6500AA

AF:

0.00227

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000239

AC:

Asia WGS

AF:

0.000577

AC:

AN:

3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Multiple gastrointestinal atresias

Uncertain:1Benign:1

Aug 03, 2020

Center for Genomics, Ann and Robert H. Lurie Children's Hospital of Chicago

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

TTC7A NM_020458.3 exon 14 p.Val545Ile (c.1633G>A): This variant has not been reported in the literature but is present in 0.2% (57/24038) of African alleles in the Genome Aggregation Database (https://gnomad.broadinstitute.org/variant/2-47251490-G-A?dataset=gnomad_r2_1). This variant is present in ClinVar (Variation ID:528460). This variant amino acid Isoleucine (Ile) is present in 3 species (Chimp, White Rhino, Opossum) and is not well conserved among evolutionarily distant species; this suggests that this variant may not impact the protein. Additional computational prediction tools do not suggest an impact. In summary, data on this variant is insufficient for disease classification. Therefore, the clinical significance of this variant is uncertain. -

Jan 24, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Inborn genetic diseases

Uncertain:1

Mar 08, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.1633G>A (p.V545I) alteration is located in exon 14 (coding exon 14) of the TTC7A gene. This alteration results from a G to A substitution at nucleotide position 1633, causing the valine (V) at amino acid position 545 to be replaced by an isoleucine (I). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Gastrointestinal defects and immunodeficiency syndrome 1

Uncertain:1

Mar 30, 2021

Center for Genomics, Ann and Robert H. Lurie Children's Hospital of Chicago

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.090

BayesDel_addAF

Benign

-0.50

BayesDel_noAF

Benign

-0.49

CADD

Benign

(source)

DANN

Benign

0.96

DEOGEN2

Benign

0.037

.;T;.

Eigen

Benign

-0.80

Eigen_PC

Benign

-0.73

FATHMM_MKL

Benign

0.68

LIST_S2

Benign

0.59

T;T;T

M_CAP

Benign

0.018

MetaRNN

Benign

0.010

T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.3

.;L;L

PhyloP100

0.60

PrimateAI

Benign

0.41

PROVEAN

Benign

-0.29

N;N;N

REVEL

Benign

0.037

Sift

Benign

0.16

T;T;T

Sift4G

Benign

0.47

T;T;T

Polyphen

0.083

B;P;.

Vest4

0.22

MVP

0.27

MPC

0.076

ClinPred

0.0042

GERP RS

1.6

Varity_R

0.022

gMVP

0.13

Mutation Taster

=92/8

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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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