chr14-90593522-G-A

Position:

• chr14-90593522-G-A

Variant summary

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

The NM_001010854.2(TTC7B):​c.2071C>T​(p.Pro691Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000686 in 1,457,652 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: TTC7B NM_001010854.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.69

Genes affected

TTC7B (HGNC:19858): (tetratricopeptide repeat domain 7B) Involved in phosphatidylinositol phosphate biosynthetic process and protein localization to plasma membrane. Located in cytosol and plasma membrane. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TTC7B	NM_001010854.2	c.2071C>T	p.Pro691Ser	missense_variant	18/20	ENST00000328459.11
TTC7B	NM_001401365.1	c.2284C>T	p.Pro762Ser	missense_variant	20/22
TTC7B	NM_001320421.2	c.1816C>T	p.Pro606Ser	missense_variant	19/21

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TTC7B	ENST00000328459.11	c.2071C>T	p.Pro691Ser	missense_variant	18/20	1	NM_001010854.2	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.86e-7 AC: 1 AN: 1457652 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 724874

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 31, 2023

The c.2071C>T (p.P691S) alteration is located in exon 18 (coding exon 18) of the TTC7B gene. This alteration results from a C to T substitution at nucleotide position 2071, causing the proline (P) at amino acid position 691 to be replaced by a serine (S). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.37
BayesDel_addAF	Uncertain	0.16	D
BayesDel_noAF	Uncertain	-0.010
CADD	Pathogenic	29
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.023	T;T;T
Eigen	Pathogenic	0.72
Eigen_PC	Pathogenic	0.75
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.94	D;D;D
M_CAP	Benign	0.024	T
MetaRNN	Uncertain	0.51	D;D;D
MetaSVM	Benign	-0.61	T
MutationAssessor	Benign	1.9	L;.;.
MutationTaster	Benign	1.0	D;D
PrimateAI	Pathogenic	0.88	D
PROVEAN	Benign	-0.050	N;N;N
REVEL	Benign	0.17
Sift	Benign	0.067	T;T;T
Sift4G	Benign	0.067	T;T;T
Polyphen		1.0	D;.;.
Vest4		0.75
MutPred		0.37		Loss of glycosylation at P691 (P = 0.0255);.;.;
MVP		0.21
MPC		0.81
ClinPred		0.75	D
GERP RS		5.6
Varity_R		0.27
gMVP		0.61

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr14-91059866;