8-96273367-T-C

Variant summary

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

The NM_014754.3(PTDSS1):c.248T>C(p.Ile83Thr) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,460,406 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I83L) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

PTDSS1
NM_014754.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 5.32

Variant links:

Genes affected

PTDSS1 (HGNC:9587): (phosphatidylserine synthase 1) The protein encoded by this gene catalyzes the formation of phosphatidylserine from either phosphatidylcholine or phosphatidylethanolamine. Phosphatidylserine localizes to the mitochondria-associated membrane of the endoplasmic reticulum, where it serves a structural role as well as a signaling role. Defects in this gene are a cause of Lenz-Majewski hyperostotic dwarfism. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Mar 2014]

PTDSS1 links:

LOC105375652 (HGNC:):

LOC105375652 links:

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ACMG classification

Classification made for transcript

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
PTDSS1	NM_014754.3 linkuse as main transcript	c.248T>C	p.Ile83Thr	missense_variant	2/13	ENST00000517309.6
LOC105375652	XR_928431.3 linkuse as main transcript	n.91-7030A>G		intron_variant, non_coding_transcript_variant
PTDSS1	NM_001290225.2 linkuse as main transcript	c.-21T>C		5_prime_UTR_variant	2/11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PTDSS1	ENST00000517309.6 linkuse as main transcript	c.248T>C	p.Ile83Thr	missense_variant	2/13	1	NM_014754.3	P1	P48651-1
PTDSS1	ENST00000337004.8 linkuse as main transcript	c.248T>C	p.Ile83Thr	missense_variant, NMD_transcript_variant	2/11	1
PTDSS1	ENST00000517557.5 linkuse as main transcript	n.322T>C		non_coding_transcript_exon_variant	2/4	2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000400

AC:

AN:

250266

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135272

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000292

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1460406

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726552

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000449

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.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Nov 20, 2022

This variant has not been reported in the literature in individuals affected with PTDSS1-related conditions. 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. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on PTDSS1 protein function. This variant is present in population databases (no rsID available, gnomAD 0.003%). This sequence change replaces isoleucine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 83 of the PTDSS1 protein (p.Ile83Thr). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.83

BayesDel_addAF

Pathogenic

0.18

BayesDel_noAF

Uncertain

0.10

Cadd

Uncertain

Dann

Uncertain

1.0

DEOGEN2

Uncertain

0.70

Eigen

Uncertain

0.66

Eigen_PC

Pathogenic

0.67

FATHMM_MKL

Uncertain

0.94

LIST_S2

Uncertain

0.96

M_CAP

Benign

0.038

MetaRNN

Uncertain

0.69

MetaSVM

Benign

-0.63

MutationAssessor

Pathogenic

3.0

MutationTaster

Benign

1.0

D;D

PrimateAI

Pathogenic

0.85

PROVEAN

Uncertain

-4.1

REVEL

Uncertain

0.35

Sift

Uncertain

0.0010

Sift4G

Uncertain

0.0040

Polyphen

0.96

Vest4

0.62

MutPred

0.50

Loss of sheet (P = 0.0142);

MVP

0.35

MPC

0.98

ClinPred

0.98

GERP RS

5.5

Varity_R

0.62

gMVP

0.89

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

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