dbSNP rs141190104: PNPLA2:p.Pro301Pro (chr11-823839-C-G) – ACMG Classification: Likely_benign (-3 pts)

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2BP4_StrongBP7

The NM_020376.4(PNPLA2):c.903C>G(p.Pro301Pro) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000695 in 1,437,988 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. P301P) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 7.0e-7 ( 0 hom. )

Consequence

PNPLA2
NM_020376.4 synonymous

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -4.90

Publications

2 publications found

Variant links:

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]

PNPLA2 Gene-Disease associations (from GenCC):

neutral lipid storage myopathy
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, ClinGen, G2P, Labcorp Genetics (formerly Invitae), Orphanet

PNPLA2 links:

ENSG00000255108 (HGNC:):

ENSG00000255108 links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.8).

BP7

Synonymous conserved (PhyloP=-4.9 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_020376.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PNPLA2	NM_020376.4	MANE Select	c.903C>G	p.Pro301Pro	synonymous	Exon 7 of 10	NP_065109.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
PNPLA2	ENST00000336615.9	TSL:1 MANE Select	c.903C>G	p.Pro301Pro	synonymous	Exon 7 of 10	ENSP00000337701.4
PNPLA2	ENST00000529255.1	TSL:1	n.191C>G		non_coding_transcript_exon	Exon 2 of 4
PNPLA2	ENST00000525250.5	TSL:2	n.1615C>G		non_coding_transcript_exon	Exon 4 of 6

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000496

AC:

AN:

201638

AF XY:

0.00000908

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000594

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.95e-7

AC:

AN:

1437988

Hom.:

Cov.:

AF XY:

0.00000140

AC XY:

AN XY:

713450

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33054

American (AMR)

AF:

0.00

AC:

AN:

41698

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25678

East Asian (EAS)

AF:

0.00

AC:

AN:

38578

South Asian (SAS)

AF:

0.00

AC:

AN:

83458

European-Finnish (FIN)

AF:

0.0000204

AC:

AN:

48982

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5744

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1101302

Other (OTH)

AF:

0.00

AC:

AN:

59494

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.325

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.80

CADD

Benign

0.048

(source)

DANN

Benign

0.76

PhyloP100

-4.9

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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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over