rs72551364

Positions:

• chr3-12433900-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM2 PP2 PP3_Strong PP5_Moderate

The NM_138711.6(PPARG):​c.1183C>T​(p.Arg395Cys) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,782 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 1/1 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: PPARG NM_138711.6 missense, splice_region
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 7.86

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 (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 9 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), PPARG. . Gene score misZ 2.1192 (greater than the threshold 3.09). Trascript score misZ 3.0978 (greater than threshold 3.09). GenCC has associacion of gene with PPARG-related familial partial lipodystrophy, Berardinelli-Seip congenital lipodystrophy.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.985
• PP5: Variant 3-12433900-C-T is Pathogenic according to our data. Variant chr3-12433900-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 8142.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PPARG	NM_138711.6	c.1183C>T	p.Arg395Cys	missense_variant, splice_region_variant	8/8	ENST00000651735.1	NP_619725.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PPARG	ENST00000651735.1	c.1183C>T	p.Arg395Cys	missense_variant, splice_region_variant	8/8		NM_138711.6	ENSP00000498313.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461782 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 727186

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: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000588 Hom.: 0

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Feb 27, 2019

DNA sequence analysis of the PPARG gene demonstrated a sequence change, c.1273C>T, in exon 7 that results in an amino acid change, p.Arg425Cys. The p.Arg425Cys change affects a moderately conserved amino acid residue located in a C-terminal ligand binding domain (LBD) of the PPARG protein that is known to be functional. The p.Arg425Cys substitution appears to be deleterious using several in-silico pathogenicity prediction tools (SIFT, CADD, Align GVGD, REVEL). This is a novel sequence change that is not present in population databases. PMID: 11788685 identified this sequence change in a patient with diabetes mellitus, hypertriglyceridemia, hirsutism and lipodystrophy of the extremities and face. X ray crystallographic structural studies also showed that tertiary configuration of protein is lost when arginine 425 residue is changed to cysteine. Further structural and functional studies by PMID: 17312272 demonstrated that the substitution to a cysteine residue at this position impairs the PPARG transcriptional activity leading to an inhibition of adipocyte differentiation. -

PPARG-related familial partial lipodystrophy Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Jan 01, 2002

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.36	D
BayesDel_noAF	Pathogenic	0.28
CADD	Pathogenic	33
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.79	.;.;.;.;.;.;.;D;D
Eigen	Pathogenic	0.81
Eigen_PC	Pathogenic	0.80
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.96	.;.;.;.;.;.;D;.;D
M_CAP	Uncertain	0.21	D
MetaRNN	Pathogenic	0.99	D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.26	D
MutationAssessor	Uncertain	2.9	.;.;.;.;.;.;.;.;M
PrimateAI	Pathogenic	0.89	D
PROVEAN	Pathogenic	-5.9	D;D;D;.;.;.;D;D;D
REVEL	Pathogenic	0.79
Sift	Uncertain	0.017	D;D;D;.;.;.;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;.;.;.;D;D;D
Polyphen		0.86	.;.;.;.;.;.;.;.;P
Vest4		0.81
MutPred		0.97		.;.;.;.;.;.;.;.;Gain of catalytic residue at P426 (P = 0.2467);
MVP		0.94
MPC		2.1
ClinPred		0.99	D
GERP RS		5.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.91
gMVP		0.89

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: rs72551364; hg19: chr3-12475399;