rs929233099

chr11-824780-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_020376.4(PNPLA2):c.1433A>G(p.Gln478Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000115 in 1,386,332 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000012 (0 hom.)
• Consequence: PNPLA2 NM_020376.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.66

Genes affected

PNPLA2 (HGNC:30802): (patatin like phospholipase domain containing 2) This gene encodes an enzyme which catalyzes the first step in the hydrolysis of triglycerides in adipose tissue. Mutations in this gene are associated with neutral lipid storage disease with myopathy. [provided by RefSeq, Jul 2010]

(HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.1300596).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PNPLA2	NM_020376.4	c.1433A>G	p.Gln478Arg	missense_variant	10/10	ENST00000336615.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PNPLA2	ENST00000336615.9	c.1433A>G	p.Gln478Arg	missense_variant	10/10	1	NM_020376.4	P1
PNPLA2	ENST00000529255.1	n.863A>G		non_coding_transcript_exon_variant	4/4	1
	ENST00000532946.1	n.307-917T>C		intron_variant, non_coding_transcript_variant		5
PNPLA2	ENST00000525250.5	n.2287A>G		non_coding_transcript_exon_variant	6/6	2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.0000115 AC: 16 AN: 1386332 Hom.: 0 Cov.: 42 AF XY: 0.0000102 AC XY: 7 AN XY: 684700

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: 0.0000148

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Neutral lipid storage myopathy Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Apr 09, 2018

This sequence change replaces glutamine with arginine at codon 478 of the PNPLA2 protein (p.Gln478Arg). The glutamine residue is weakly conserved and there is a small physicochemical difference between glutamine and arginine. While this variant is not present in population databases, the frequency information is unreliable, as metrics indicate poor data quality at this position in the ExAC database. This variant has not been reported in the literature in individuals with PNPLA2-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. 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	0.067
BayesDel_addAF	Benign	-0.19	T
BayesDel_noAF	Benign	-0.51
Cadd	Benign	12
Dann	Benign	0.73
DEOGEN2	Benign	0.18	T
Eigen	Benign	-0.95
Eigen_PC	Benign	-0.94
FATHMM_MKL	Benign	0.21	N
LIST_S2	Benign	0.23	T
M_CAP	Benign	0.015	T
MetaRNN	Benign	0.13	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.0	N
MutationTaster	Benign	1.0	N
PrimateAI	Uncertain	0.73	T
PROVEAN	Benign	-0.78	N
REVEL	Benign	0.096
Sift	Pathogenic	0.0	D
Sift4G	Benign	0.32	T
Polyphen		0.047	B
Vest4		0.28
MutPred		0.057		Gain of glycosylation at P477 (P = 0.05);
MVP		0.19
MPC		0.24
ClinPred		0.21	T
GERP RS		1.6
Varity_R		0.10
gMVP		0.21

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: rs929233099; hg19: chr11-824780;