2-46917239-C-T

Variant summary

Our verdict is Benign. Variant got -10 ACMG points: 0P and 10B. BP4_StrongBP6_ModerateBS1

The NM_001288953.2(TTC7A):c.44C>T(p.Ser15Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000778 in 700,616 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. 11/13 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

Frequency

Genomes: 𝑓 0.00026 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00092 ( 3 hom. )

Consequence

TTC7A
NM_001288953.2 missense

Scores

Clinical Significance

Likely benign criteria provided, single submitter B:1

Conservation

PhyloP100: 0.492

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 links:

MCFD2 (HGNC:18451): (multiple coagulation factor deficiency 2, ER cargo receptor complex subunit) This gene encodes a soluble luminal protein with two calmodulin-like EF-hand motifs at its C-terminus. This protein forms a complex with LMAN1 (lectin mannose binding protein 1; also known as ERGIC-53) that facilitates the transport of coagulation factors V (FV) and VIII (FVIII) from the endoplasmic reticulum to the Golgi apparatus via an endoplasmic reticulum Golgi intermediate compartment (ERGIC). Mutations in this gene cause combined deficiency of FV and FVIII (F5F8D); a rare autosomal recessive bleeding disorder characterized by mild to moderate bleeding and coordinate reduction in plasma FV and FVIII levels. This protein has also been shown to maintain stem cell potential in adult central nervous system and is a marker for testicular germ cell tumors. The 3' UTR of this gene contains a transposon-like human repeat element named 'THE 1'. A processed RNA pseudogene of this gene is on chromosome 6p22.1. Alternative splicing results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, Apr 2016]

MCFD2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -10 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0037568212).

BP6

Variant 2-46917239-C-T is Benign according to our data. Variant chr2-46917239-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 2498818.Status of the report is criteria_provided_single_submitter, 1 stars.

BS1

Variant frequency is greater than expected in population sas. gnomad4 allele frequency = 0.000256 (39/152094) while in subpopulation SAS AF= 0.00625 (30/4802). AF 95% confidence interval is 0.0045. There are 0 homozygotes in gnomad4. There are 30 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons
TTC7A	NM_001288953.2 linkuse as main transcript	c.44C>T	p.Ser15Phe	missense_variant	2/21
MCFD2	NM_001171508.2 linkuse as main transcript	c.-6-8062G>A		intron_variant
MCFD2	NM_001171511.3 linkuse as main transcript	c.93-9270G>A		intron_variant
TTC7A	XM_047445148.1 linkuse as main transcript	c.-81+662C>T		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	Appris	UniProt
TTC7A	ENST00000409245.5 linkuse as main transcript	c.44C>T	p.Ser15Phe	missense_variant	2/21	2
MCFD2	ENST00000409147.1 linkuse as main transcript	c.-7-9270G>A		intron_variant		2		Q8NI22-2
MCFD2	ENST00000409207.5 linkuse as main transcript	c.-6-8062G>A		intron_variant		2	P1	Q8NI22-1

Frequencies

GnomAD3 genomes

AF:

0.000263

AC:

AN:

151976

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00645

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000118

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00118

AC:

156

AN:

131890

Hom.:

AF XY:

0.00162

AC XY:

117

AN XY:

72284

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000126

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00643

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000177

Gnomad OTH exome

AF:

0.000495

GnomAD4 exome

AF:

0.000922

AC:

506

AN:

548522

Hom.:

Cov.:

AF XY:

0.00129

AC XY:

382

AN XY:

297062

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000117

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00653

Gnomad4 FIN exome

AF:

0.0000601

Gnomad4 NFE exome

AF:

0.000231

Gnomad4 OTH exome

AF:

0.000557

GnomAD4 genome

AF:

0.000256

AC:

AN:

152094

Hom.:

Cov.:

AF XY:

0.000403

AC XY:

AN XY:

74358

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00625

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000118

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000283

Hom.:

Bravo

AF:

0.0000869

ExAC

AF:

0.00312

AC:

Asia WGS

AF:

0.00202

AC:

AN:

3478

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

CeGaT Center for Human Genetics Tuebingen

Jan 01, 2024

TTC7A: BP4, BS2 -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Benign

-0.63

BayesDel_noAF

Benign

-0.67

Cadd

Benign

Dann

Benign

0.96

Eigen

Benign

-0.99

Eigen_PC

Benign

-1.1

FATHMM_MKL

Benign

0.010

LIST_S2

Benign

0.49

M_CAP

Benign

0.0020

MetaRNN

Benign

0.0038

MetaSVM

Benign

-1.0

MutationTaster

Benign

1.0

N;N;N;N

PROVEAN

Benign

-0.55

REVEL

Benign

0.028

Sift

Benign

0.048

Sift4G

Benign

0.40

Polyphen

0.011

Vest4

0.29

MutPred

0.20

Loss of disorder (P = 0.0059);

MVP

0.26

ClinPred

0.018

GERP RS

0.23

Splicing

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