chr14-102432126-C-T

Position:

• chr14-102432126-C-T

Variant summary

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

The NM_014844.5(TECPR2):​c.1415C>T​(p.Thr472Ile) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000433 in 1,407,924 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/23 in silico tools predict a benign outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000043 (0 hom.)
• Consequence: TECPR2 NM_014844.5 missense, splice_region
• Scores: Splicing: ADA: 0.9990
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.34

Genes affected

TECPR2 (HGNC:19957): (tectonin beta-propeller repeat containing 2) The protein encoded by this gene is a member of the tectonin beta-propeller repeat-containing (TECPR) family, and contains both TECPR and tryptophan-aspartic acid repeat (WD repeat) domains. This gene has been implicated in autophagy, as reduced expression levels of this gene have been associated with impaired autophagy. Recessive mutations in this gene have been associated with a hereditary form of spastic paraparesis (HSP). HSP is characterized by progressive spasticity and paralysis of the legs. There is also some evidence linking mutations in this gene with birdshot chorioretinopathy (BSCR), which results in inflammation of the choroid and retina. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Aug 2015]

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	Protein	UniProt
TECPR2	NM_014844.5	c.1415C>T	p.Thr472Ile	missense_variant, splice_region_variant	8/20	ENST00000359520.12	NP_055659.2
TECPR2	NM_001172631.3	c.1415C>T	p.Thr472Ile	missense_variant, splice_region_variant	8/17		NP_001166102.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TECPR2	ENST00000359520.12	c.1415C>T	p.Thr472Ile	missense_variant, splice_region_variant	8/20	1	NM_014844.5	ENSP00000352510.7
TECPR2	ENST00000558678.1	c.1415C>T	p.Thr472Ile	missense_variant, splice_region_variant	8/17	1		ENSP00000453671.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.0000433 AC: 61 AN: 1407924 Hom.: 0 Cov.: 31 AF XY: 0.0000461 AC XY: 32 AN XY: 694346

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: 0.0000564

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000135 AC: 1

ExAC AF: 0.00000850 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary spastic paraplegia 49 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 20, 2022

This sequence change replaces threonine, which is neutral and polar, with isoleucine, which is neutral and non-polar, at codon 472 of the TECPR2 protein (p.Thr472Ile). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with TECPR2-related conditions. ClinVar contains an entry for this variant (Variation ID: 408915). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.25	T
BayesDel_noAF	Benign	-0.60
CADD	Uncertain	24
DANN	Benign	0.97
DEOGEN2	Benign	0.0020	T;.
Eigen	Benign	-0.096
Eigen_PC	Benign	0.084
FATHMM_MKL	Uncertain	0.81	D
LIST_S2	Benign	0.68	T;T
M_CAP	Benign	0.0052	T
MetaRNN	Benign	0.10	T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.5	L;L
PrimateAI	Benign	0.37	T
PROVEAN	Benign	-0.44	N;N
REVEL	Benign	0.072
Sift	Benign	0.14	T;T
Sift4G	Benign	0.077	T;T
Polyphen		0.0030	B;.
Vest4		0.17
MVP		0.043
MPC		0.33
ClinPred		0.35	T
GERP RS		4.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.092
gMVP		0.15

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.79
SpliceAI score (max)		0.070		Details are displayed if max score is > 0.2

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

Publications

LitVar

Other links and lift over

dbSNP: rs370462085; hg19: chr14-102898463;