rs775628426

Variant names:

• chr3-12351593-A-G
• rs775628426
• ENST00000287820.10:c.1A>G

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PVS1_Moderate

The ENST00000287820.10(PPARG):​c.1A>G​(p.Met1?) variant causes a start lost change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000414 in 1,449,356 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: PPARG ENST00000287820.10 start_lost
• Clinical Significance: Uncertain significance no assertion criteria provided U:1
• Conservation: PhyloP100: 1.72
• Publications: 1 publications found

Genes affected

PPARG (HGNC:9236): (peroxisome proliferator activated receptor gamma) This gene encodes a member of the peroxisome proliferator-activated receptor (PPAR) subfamily of nuclear receptors. PPARs form heterodimers with retinoid X receptors (RXRs) and these heterodimers regulate transcription of various genes. Three subtypes of PPARs are known: PPAR-alpha, PPAR-delta, and PPAR-gamma. The protein encoded by this gene is PPAR-gamma and is a regulator of adipocyte differentiation. Additionally, PPAR-gamma has been implicated in the pathology of numerous diseases including obesity, diabetes, atherosclerosis and cancer. Alternatively spliced transcript variants that encode different isoforms have been described. [provided by RefSeq, Jul 2008]

PPARG Gene-Disease associations (from GenCC):

• PPARG-related familial partial lipodystrophy

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, Ambry Genetics, G2P, Genomics England PanelApp
• Berardinelli-Seip congenital lipodystrophy

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PVS1: Start lost variant, next in-frame start position is after 1 pathogenic variants. Next in-frame start position is after 29 codons. Genomic position: 12379706. Lost 0.056 part of the original CDS.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PPARG	NM_138711.6	c.-8-28111A>G		intron_variant	Intron 2 of 7	ENST00000651735.1	NP_619725.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PPARG	ENST00000651735.1	c.-8-28111A>G		intron_variant	Intron 2 of 7		NM_138711.6	ENSP00000498313.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000797 AC: 2 AN: 251000 AF XY: 0.0000147

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000545

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000881

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000414 AC: 6 AN: 1449356 Hom.: 0 Cov.: 30 AF XY: 0.00000693 AC XY: 5 AN XY: 721746

African (AFR) AF: 0.00 AC: 0 AN: 33268

American (AMR) AF: 0.00 AC: 0 AN: 44710

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26072

East Asian (EAS) AF: 0.0000252 AC: 1 AN: 39614

South Asian (SAS) AF: 0.00 AC: 0 AN: 85972

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53332

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5744

European-Non Finnish (NFE) AF: 9.09e-7 AC: 1 AN: 1100602

Other (OTH) AF: 0.0000666 AC: 4 AN: 60042

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000756

ExAC AF: 0.00000824 AC: 1

EpiCase AF: 0.00

EpiControl AF: 0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: no assertion criteria provided

Submissions by phenotype

PPARG-related disorder Uncertain:1

May 08, 2024

PreventionGenetics, part of Exact Sciences

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

The PPARG c.1A>G variant is predicted to disrupt the translation initiation site (Start loss). To our knowledge, this variant has not been reported in the literature. A downstream methionine codon is located at amino acid 29, and it is unknown whether protein translation is able to initiate at alternative methionine residues. This variant is reported in 0.0054% of alleles in individuals of East Asian descent in gnomAD. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Uncertain	0.028	T
BayesDel_noAF	Uncertain	-0.030
CADD	Benign	20
DANN	Benign	0.96
DEOGEN2	Benign	0.27	T
Eigen	Benign	-0.28
Eigen_PC	Benign	-0.17
FATHMM_MKL	Benign	0.28	N
LIST_S2	Uncertain	0.90	D
M_CAP	Pathogenic	0.50	D
MetaRNN	Pathogenic	0.98	D
MetaSVM	Uncertain	-0.27	T
PhyloP100		1.7
PROVEAN	Benign	-0.050	N
REVEL	Uncertain	0.38
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.0	B
Vest4		0.70
MutPred		0.99		Gain of glycosylation at T4 (P = 0.0325);
MVP		0.94
ClinPred		0.98	D
GERP RS		2.4
PromoterAI		0.026	Neutral
Varity_R		0.83
gMVP		0.16
Mutation Taster		=138/62	polymorphism

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

Other links and lift over

dbSNP: rs775628426; hg19: chr3-12393092;