20-37996802-A-G

Position:

• chr20-37996802-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_001303457.2(TTI1):​c.2945T>C​(p.Leu982Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TTI1 NM_001303457.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.73

Genes affected

TTI1 (HGNC:29029): (TELO2 interacting protein 1) Involved in regulation of TOR signaling. Located in cytoplasm. Part of TORC1 complex and TORC2 complex. [provided by Alliance of Genome Resources, Apr 2022]

TTI1 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.877

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TTI1	NM_001303457.2	c.2945T>C	p.Leu982Ser	missense_variant	6/8	ENST00000373447.8	NP_001290386.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TTI1	ENST00000373447.8	c.2945T>C	p.Leu982Ser	missense_variant	6/8	1	NM_001303457.2	ENSP00000362546.3
TTI1	ENST00000373448.6	c.2945T>C	p.Leu982Ser	missense_variant	7/9	1		ENSP00000362547.2
TTI1	ENST00000449821.1	c.2945T>C	p.Leu982Ser	missense_variant	5/7	2		ENSP00000407270.1
TTI1	ENST00000473288.1	n.404T>C		non_coding_transcript_exon_variant	3/4	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 20, 2024

The c.2945T>C (p.L982S) alteration is located in exon 7 (coding exon 5) of the TTI1 gene. This alteration results from a T to C substitution at nucleotide position 2945, causing the leucine (L) at amino acid position 982 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	Pathogenic	0.70
BayesDel_addAF	Pathogenic	0.35	D
BayesDel_noAF	Pathogenic	0.26
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.29	T;T;T
Eigen	Pathogenic	0.77
Eigen_PC	Pathogenic	0.74
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.82	.;.;T
M_CAP	Benign	0.039	D
MetaRNN	Pathogenic	0.88	D;D;D
MetaSVM	Benign	-0.37	T
MutationAssessor	Uncertain	2.4	M;M;M
PrimateAI	Pathogenic	0.82	D
PROVEAN	Pathogenic	-4.8	D;D;D
REVEL	Uncertain	0.61
Sift	Pathogenic	0.0	D;D;D
Sift4G	Pathogenic	0.0	D;D;D
Polyphen		1.0	D;D;D
Vest4		0.91
MutPred		0.57		Loss of ubiquitination at K981 (P = 0.0709);Loss of ubiquitination at K981 (P = 0.0709);Loss of ubiquitination at K981 (P = 0.0709);
MVP		0.81
MPC		0.73
ClinPred		0.99	D
GERP RS		5.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.78
gMVP		0.71

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: chr20-36625204;