rs587777185

Positions:

• chr19-7554578-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP2 PP3 PP5

The ENST00000600737.6(PNPLA6):​c.2489G>A​(p.Gly830Glu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G830R) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PNPLA6 ENST00000600737.6 missense
• Clinical Significance: Pathogenic/Likely pathogenic no assertion criteria provided P:2
• Conservation: PhyloP100: 9.90

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), PNPLA6. . Gene score misZ 4.3547 (greater than the threshold 3.09). Trascript score misZ 3.5139 (greater than threshold 3.09). GenCC has associacion of gene with trichomegaly-retina pigmentary degeneration-dwarfism syndrome, ataxia-hypogonadism-choroidal dystrophy syndrome, Laurence-Moon syndrome, cerebellar ataxia-hypogonadism syndrome, retinal dystrophy-ataxia-pituitary hormone abnormality-hypogonadism syndrome, PNPLA6-related spastic paraplegia with or without ataxia, hereditary spastic paraplegia 39.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.768
• PP5: Variant 19-7554578-G-A is Pathogenic according to our data. Variant chr19-7554578-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 101044.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PNPLA6	NM_001166114.2	c.2489G>A	p.Gly830Glu	missense_variant	21/32	ENST00000600737.6	NP_001159586.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PNPLA6	ENST00000600737.6	c.2489G>A	p.Gly830Glu	missense_variant	21/32	1	NM_001166114.2	ENSP00000473211	P3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

Alfa AF: 0.00459 Hom.: 0

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2

Revision: no assertion criteria provided

Submissions by phenotype

Hereditary spastic paraplegia 39 Pathogenic:2

Pathogenic, no assertion criteria provided	literature only	OMIM	Jan 01, 2014	- -
Likely pathogenic, no assertion criteria provided	provider interpretation	Solve-RD Consortium	Jun 01, 2022	Variant confirmed as disease-causing by referring clinical team -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.91
BayesDel_addAF	Uncertain	0.12	D
BayesDel_noAF	Uncertain	-0.070
CADD	Pathogenic	28
DANN	Uncertain	0.99
Eigen	Uncertain	0.35
Eigen_PC	Uncertain	0.38
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.97	.;D;D;D;D
M_CAP	Pathogenic	0.30	D
MetaRNN	Pathogenic	0.77	D;D;D;D;D
MetaSVM	Benign	-0.82	T
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.68	T
PROVEAN	Benign	-1.9	N;N;N;N;.
REVEL	Pathogenic	0.74
Sift	Uncertain	0.0070	D;D;D;D;.
Sift4G	Uncertain	0.038	D;T;T;D;T
Polyphen		0.23	B;.;.;B;.
Vest4		0.76
MVP		0.44
MPC		1.4
ClinPred		0.92	D
GERP RS		4.7
Varity_R		0.30
gMVP		0.96

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

Other links and lift over

dbSNP: rs587777185; hg19: chr19-7619464;