rs773955314

Variant names:

Your query was ambiguous. Multiple possible variants found:

Variant summary

Our verdict is Pathogenic. The variant received 14 ACMG points: 14P and 0B. PS1PM1PM2PP2PP3_StrongPP5

The NM_001166114.2(PNPLA6):c.3355G>A(p.Gly1119Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000205 in 1,613,374 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a pathogenic outcome for this variant. 12/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely pathogenic in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G1119V) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000021 ( 1 hom. )

Consequence

PNPLA6
NM_001166114.2 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:4U:1

Conservation

PhyloP100: 9.86

Publications

9 publications found

Variant links:

Genes affected

PNPLA6 (HGNC:16268): (patatin like phospholipase domain containing 6) This gene encodes a phospholipase that deacetylates intracellular phosphatidylcholine to produce glycerophosphocholine. It is thought to function in neurite outgrowth and process elongation during neuronal differentiation. The protein is anchored to the cytoplasmic face of the endoplasmic reticulum in both neurons and non-neuronal cells. Mutations in this gene result in autosomal recessive spastic paraplegia, and the protein is the target for neurodegeneration induced by organophosphorus compounds and chemical warfare agents. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2009]

PNPLA6 Gene-Disease associations (from GenCC):

ataxia-hypogonadism-choroidal dystrophy syndrome
Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: G2P, Orphanet
PNPLA6-related spastic paraplegia with or without ataxia
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
retinal dystrophy-ataxia-pituitary hormone abnormality-hypogonadism syndrome
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
hereditary spastic paraplegia 39
Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet
cerebellar ataxia-hypogonadism syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
Laurence-Moon syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
trichomegaly-retina pigmentary degeneration-dwarfism syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

PNPLA6 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 14 ACMG points.

PS1

Transcript NM_001166114.2 (PNPLA6) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in ClinVar as 1496092

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 5 uncertain in NM_001166114.2

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant in the PNPLA6 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 29 curated pathogenic missense variants (we use a threshold of 10). The gene has 7 curated benign missense variants. Gene score misZ: 4.3547 (above the threshold of 3.09). Trascript score misZ: 3.5139 (above the threshold of 3.09). GenCC associations: The gene is linked to retinal dystrophy-ataxia-pituitary hormone abnormality-hypogonadism syndrome, cerebellar ataxia-hypogonadism syndrome, PNPLA6-related spastic paraplegia with or without ataxia, ataxia-hypogonadism-choroidal dystrophy syndrome, trichomegaly-retina pigmentary degeneration-dwarfism syndrome, hereditary spastic paraplegia 39, Laurence-Moon syndrome.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.967

PP5

Variant 19-7557242-G-A is Pathogenic according to our data. Variant chr19-7557242-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 409993.We mark this variant Likely_pathogenic, oryginal submission is: [Conflicting_classifications_of_pathogenicity].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PNPLA6	NM_001166114.2 link	c.3355G>A	p.Gly1119Arg	missense_variant	Exon 27 of 32	ENST00000600737.6	NP_001159586.1	Q8IY17A0A384DVU0

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PNPLA6	ENST00000600737.6 link	c.3355G>A	p.Gly1119Arg	missense_variant	Exon 27 of 32	1	NM_001166114.2	ENSP00000473211.1		A0A384DVU0

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152234

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000320

AC:

AN:

250180

AF XY:

0.0000295

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000869

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000353

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000205

AC:

AN:

1461140

Hom.:

Cov.:

AF XY:

0.0000206

AC XY:

AN XY:

726944

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33474

American (AMR)

AF:

0.0000671

AC:

AN:

44712

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26108

East Asian (EAS)

AF:

0.00

AC:

AN:

39692

South Asian (SAS)

AF:

0.0000232

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52972

Middle Eastern (MID)

AF:

0.000173

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.0000207

AC:

AN:

1111782

Other (OTH)

AF:

0.0000166

AC:

AN:

60378

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.480

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152234

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74362

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41460

American (AMR)

AF:

0.00

AC:

AN:

15284

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5198

South Asian (SAS)

AF:

0.00

AC:

AN:

4838

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10618

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000441

AC:

AN:

68046

Other (OTH)

AF:

0.00

AC:

AN:

2094

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.0000782

Hom.:

Bravo

AF:

0.0000227

ExAC

AF:

0.0000330

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:4Uncertain:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Trichomegaly-retina pigmentary degeneration-dwarfism syndrome

Pathogenic:1

Feb 01, 2015

OMIM

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Ataxia-hypogonadism-choroidal dystrophy syndrome

Pathogenic:1

Jul 12, 2021

Molecular Medicine for Neurodegenerative and Neuromuscular Diseases Unit, IRCCS Fondazione Stella Maris

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:research

- -

not provided

Pathogenic:1

Jul 15, 2019

Genetic Services Laboratory, University of Chicago

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

DNA sequence analysis of the PNPLA6 gene demonstrated a sequence change, c.3241G>A, in exon 30 that results in an amino acid change, p.Gly1081Arg. This sequence change (described in the literature as c.3385G>A, p.Gly1129Arg) has been reported with a second pathogenic variant in patients clinically diagnosed with Oliver-McFarlane syndrome with features of Laurence-Moon syndrome (PMID: 25480986). A different nucleotide substitution resulting in the same amino acid change (c.3241G>C; described in the literature as c.3385G>C) has also been identified in patients with Oliver McFarlane syndrome (PMID: 25574898). The c.3241G>A sequence change has been described in the gnomAD database with a low population frequency of 0.0087% in the Latino sub-population (dbSNP rs773955314). The p.Gly1081Arg change affects a highly conserved amino acid residue located in a domain of the PNPLA6 protein that is known to be functional. The p.Gly1081Arg substitution appears to be deleterious using several in-silico pathogenicity prediction tools (SIFT, PolyPhen2, Align GVGD, REVEL). -

Hereditary spastic paraplegia 39

Pathogenic:1

Jan 24, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

ClinVar contains an entry for this variant (Variation ID: 409993). This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 1081 of the PNPLA6 protein (p.Gly1081Arg). This variant is present in population databases (rs773955314, gnomAD 0.009%), including at least one homozygous and/or hemizygous individual. This missense change has been observed in individuals with Oliver-McFarlane syndrome and/or Laurence-Moon syndrome (PMID: 25480986, 25574898). This variant is also known as p.Gly1129Arg. 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) performed at Invitae indicates that this missense variant is expected to disrupt PNPLA6 protein function. Experimental studies have shown that this missense change affects PNPLA6 function (PMID: 25480986). For these reasons, this variant has been classified as Pathogenic. -

Laurence-Moon syndrome;C1848745:Trichomegaly-retina pigmentary degeneration-dwarfism syndrome;C1859093:Ataxia-hypogonadism-choroidal dystrophy syndrome;C2677586:Hereditary spastic paraplegia 39

Uncertain:1

Apr 08, 2023

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:research

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.92

BayesDel_addAF

Pathogenic

0.29

BayesDel_noAF

Pathogenic

0.37

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

Eigen

Pathogenic

0.74

Eigen_PC

Uncertain

0.59

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

1.0

.;D;D;D;D

M_CAP

Pathogenic

0.91

MetaRNN

Pathogenic

0.97

D;D;D;D;D

MetaSVM

Uncertain

0.74

PhyloP100

9.9

PrimateAI

Pathogenic

0.87

PROVEAN

Pathogenic

-7.2

D;D;D;D;.

REVEL

Pathogenic

0.85

Sift

Uncertain

0.0010

D;D;D;D;.

Sift4G

Pathogenic

0.0010

D;D;D;D;D

Polyphen

1.0

D;.;.;D;.

Vest4

0.95

MVP

0.79

MPC

2.2

ClinPred

0.98

GERP RS

4.1

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.8

Varity_R

0.82

gMVP

0.93

Mutation Taster

=0/100

disease causing (ClinVar)

(source)

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

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rs773955314

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over