2-46917202-C-T

Position:

• chr2-46917202-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001288953.2(TTC7A):​c.7C>T​(p.Pro3Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000728 in 549,740 control chromosomes in the GnomAD database, with no homozygous occurrence. 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 Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000073 (0 hom.)
• Consequence: TTC7A NM_001288953.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.505

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]

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]

ACMG classification

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=0.14371273).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TTC7A	NM_001288953.2	c.7C>T	p.Pro3Ser	missense_variant	2/21		NP_001275882.1
MCFD2	NM_001171508.2	c.-6-8025G>A		intron_variant			NP_001164979.1
MCFD2	NM_001171511.3	c.93-9233G>A		intron_variant			NP_001164982.1
TTC7A	XM_047445148.1	c.-81+625C>T		intron_variant			XP_047301104.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TTC7A	ENST00000409245.5	c.7C>T	p.Pro3Ser	missense_variant	2/21	2		ENSP00000386307
MCFD2	ENST00000409147.1	c.-7-9233G>A		intron_variant		2		ENSP00000387082
MCFD2	ENST00000409207.5	c.-6-8025G>A		intron_variant		2		ENSP00000386386	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000728 AC: 4 AN: 549740 Hom.: 0 Cov.: 0 AF XY: 0.0000134 AC XY: 4 AN XY: 297664

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000116

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

AiLife Diagnostics, AiLife Diagnostics

Apr 13, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.36	T
BayesDel_noAF	Benign	-0.76
CADD	Benign	8.1
DANN	Benign	0.56
Eigen	Benign	-0.52
Eigen_PC	Benign	-0.83
FATHMM_MKL	Benign	0.0019	N
LIST_S2	Benign	0.38	T
M_CAP	Benign	0.00089	T
MetaRNN	Benign	0.14	T
MetaSVM	Benign	-1.0	T
MutationTaster	Benign	1.0	N;N;N;N
PROVEAN	Benign	0.23	N
REVEL	Benign	0.057
Sift	Pathogenic	0.0	D
Sift4G	Benign	1.0	T
Polyphen		0.94	P
Vest4		0.10
MutPred		0.23		Gain of phosphorylation at P3 (P = 0.0187);
MVP		0.35
ClinPred		0.13	T
GERP RS		0.23

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1300459632; hg19: chr2-47144341;