8-37762729-G-T

Position:

• chr8-37762729-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM1 PM2 BP4

The NM_007198.4(PLPBP):​c.70G>T​(p.Val24Leu) variant causes a missense change. The variant allele was found at a frequency of 0.000000698 in 1,433,274 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 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. V24M) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
• Consequence: PLPBP NM_007198.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.61

Genes affected

PLPBP (HGNC:9457): (pyridoxal phosphate binding protein) This gene encodes a pyridoxal 5'-phosphate binding protein involved in the homeostatic regulation of intracellular pyridoxal 5'-phosphate. This gene has a tumor suppressive effect on hepatocellular carcinoma and other solid tumors of epithelial origin. Naturally occurring mutations in this gene are associated with a pyridoxine-dependent epilepsy. [provided by RefSeq, Mar 2017]

PLPBP (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM1: In a chain Pyridoxal phosphate homeostasis protein (size 274) in uniprot entity PLPHP_HUMAN there are 4 pathogenic changes around while only 1 benign (80%) in NM_007198.4
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.34593415).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PLPBP	NM_007198.4	c.70G>T	p.Val24Leu	missense_variant	1/8	ENST00000328195.8	NP_009129.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PLPBP	ENST00000328195.8	c.70G>T	p.Val24Leu	missense_variant	1/8	1	NM_007198.4	ENSP00000333551.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.98e-7 AC: 1 AN: 1433274 Hom.: 0 Cov.: 34 AF XY: 0.00 AC XY: 0 AN XY: 711324

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: 0.0000168

GnomAD4 genome Cov.: 32

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

Labcorp Genetics (formerly Invitae), Labcorp

Aug 09, 2022

This sequence change replaces valine, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 24 of the PROSC protein (p.Val24Leu). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with PROSC-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). 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	0.18
BayesDel_addAF	Benign	-0.12	T
BayesDel_noAF	Benign	-0.41
CADD	Uncertain	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.14	T;T
Eigen	Uncertain	0.29
Eigen_PC	Uncertain	0.36
FATHMM_MKL	Benign	0.70	D
LIST_S2	Benign	0.75	T;T
M_CAP	Benign	0.040	D
MetaRNN	Benign	0.35	T;T
MetaSVM	Benign	-0.84	T
PrimateAI	Uncertain	0.71	T
PROVEAN	Benign	-1.5	N;N
REVEL	Benign	0.13
Sift	Uncertain	0.019	D;D
Sift4G	Uncertain	0.031	D;T
Polyphen		0.60	P;.
Vest4		0.32
MutPred		0.61		Loss of MoRF binding (P = 0.1872);Loss of MoRF binding (P = 0.1872);
MVP		0.57
MPC		0.45
ClinPred		0.95	D
GERP RS		4.6
Varity_R		0.35
gMVP		0.65

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs35423325; hg19: chr8-37620247;