Genetic Variant PIP4P1:p.Pro74Arg (chr14-20460767-G-C) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_144568.4(PIP4P1):c.221C>G(p.Pro74Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000657 in 152,130 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Consequence

PIP4P1
NM_144568.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 9.33

Variant links:

Genes affected

PIP4P1 (HGNC:19299): (phosphatidylinositol-4,5-bisphosphate 4-phosphatase 1) TMEM55B catalyzes the degradation of phosphatidylinositol 4,5-bisphosphate (PtdIns-4,5-P2) by removing the 4-phosphate (Ungewickell et al., 2005 [PubMed 16365287]).[supplied by OMIM, Mar 2008]

PIP4P1 links:

Genome browser will be placed here

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 rank	MANE	Protein	UniProt
PIP4P1	NM_144568.4 link	c.221C>G	p.Pro74Arg	missense_variant	Exon 2 of 7	ENST00000250489.9	NP_653169.2	Q86T03-1
PIP4P1	NM_001100814.3 link	c.242C>G	p.Pro81Arg	missense_variant	Exon 2 of 7		NP_001094284.1	Q86T03-2
PIP4P1	XM_024449739.2 link	c.242C>G	p.Pro81Arg	missense_variant	Exon 2 of 6		XP_024305507.1
PIP4P1	XM_024449740.2 link	c.221C>G	p.Pro74Arg	missense_variant	Exon 2 of 6		XP_024305508.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PIP4P1	ENST00000250489.9 link	c.221C>G	p.Pro74Arg	missense_variant	Exon 2 of 7	1	NM_144568.4	ENSP00000250489.4		Q86T03-1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152130

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

Cov.:

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152130

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74308

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000189

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Aug 11, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.242C>G (p.P81R) alteration is located in exon 2 (coding exon 2) of the TMEM55B gene. This alteration results from a C to G substitution at nucleotide position 242, causing the proline (P) at amino acid position 81 to be replaced by an arginine (R). 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

0.83

BayesDel_addAF

Pathogenic

0.40

BayesDel_noAF

Pathogenic

0.34

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Benign

0.22

T;.

Eigen

Pathogenic

0.82

Eigen_PC

Pathogenic

0.81

FATHMM_MKL

Uncertain

0.97

LIST_S2

Uncertain

0.91

D;D

M_CAP

Benign

0.023

MetaRNN

Uncertain

0.74

D;D

MetaSVM

Uncertain

-0.22

PrimateAI

Uncertain

0.78

PROVEAN

Uncertain

-3.1

D;D

REVEL

Uncertain

0.42

Sift

Uncertain

0.0040

D;D

Sift4G

Uncertain

0.0060

D;D

Polyphen

1.0

D;D

Vest4

0.71

MutPred

0.57

Gain of catalytic residue at G77 (P = 0.0051);.;

MVP

0.28

MPC

1.6

ClinPred

0.99

GERP RS

5.1

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.6

Varity_R

0.51

gMVP

0.36

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