chr7-128252071-A-G

Position:

• chr7-128252071-A-G

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP6

The NM_000230.3(LEP):​c.53A>G​(p.Tyr18Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000326 in 1,614,106 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00025 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00033 (1 hom.)
• Consequence: LEP NM_000230.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:2
• Conservation: PhyloP100: 0.312

Genes affected

LEP (HGNC:6553): (leptin) This gene encodes a protein that is secreted by white adipocytes into the circulation and plays a major role in the regulation of energy homeostasis. Circulating leptin binds to the leptin receptor in the brain, which activates downstream signaling pathways that inhibit feeding and promote energy expenditure. This protein also has several endocrine functions, and is involved in the regulation of immune and inflammatory responses, hematopoiesis, angiogenesis, reproduction, bone formation and wound healing. Mutations in this gene and its regulatory regions cause severe obesity and morbid obesity with hypogonadism in human patients. A mutation in this gene has also been linked to type 2 diabetes mellitus development. [provided by RefSeq, Aug 2017]

ACMG classification

Verdict is Likely_benign. Variant got -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.0104468465).
• BP6: Variant 7-128252071-A-G is Benign according to our data. Variant chr7-128252071-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 910456.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=2}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LEP	NM_000230.3	c.53A>G	p.Tyr18Cys	missense_variant	2/3	ENST00000308868.5
LEP	XM_005250340.6	c.53A>G	p.Tyr18Cys	missense_variant	2/3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LEP	ENST00000308868.5	c.53A>G	p.Tyr18Cys	missense_variant	2/3	1	NM_000230.3	P1

Frequencies

GnomAD3 genomes AF: 0.000250 AC: 38 AN: 152128 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000966

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00366

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000206

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.000374 AC: 94 AN: 251496 Hom.: 0 AF XY: 0.000294 AC XY: 40 AN XY: 135922

Gnomad AFR exome AF: 0.000123

Gnomad AMR exome AF: 0.0000867

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00304

Gnomad SAS exome AF: 0.000261

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000211

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.000334 AC: 488 AN: 1461860 Hom.: 1 Cov.: 32 AF XY: 0.000309 AC XY: 225 AN XY: 727232

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.0000671

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00189

Gnomad4 SAS exome AF: 0.000128

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000324

Gnomad4 OTH exome AF: 0.000629

GnomAD4 genome AF: 0.000250 AC: 38 AN: 152246 Hom.: 0 Cov.: 32 AF XY: 0.000188 AC XY: 14 AN XY: 74430

Gnomad4 AFR AF: 0.0000963

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00367

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000206

Gnomad4 OTH AF: 0.000473

Alfa AF: 0.000266 Hom.: 0

Bravo AF: 0.000276

TwinsUK AF: 0.000270 AC: 1

ALSPAC AF: 0.00 AC: 0

ESP6500AA AF: 0.000454 AC: 2

ESP6500EA AF: 0.000465 AC: 4

ExAC AF: 0.000412 AC: 50

Asia WGS AF: 0.00202 AC: 7 AN: 3478

EpiCase AF: 0.000491

EpiControl AF: 0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2 Benign:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:1 Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Aug 31, 2021	This sequence change replaces tyrosine with cysteine at codon 18 of the LEP protein (p.Tyr18Cys). The tyrosine residue is highly conserved and there is a large physicochemical difference between tyrosine and cysteine. This variant is present in population databases (rs148407750, ExAC 0.3%). This missense change has been observed in individual(s) with morbid obesity (PMID: 28377240). ClinVar contains an entry for this variant (Variation ID: 910456). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The cysteine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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. -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 03, 2015	See Variant Classification Assertion Criteria. -

Obesity due to congenital leptin deficiency Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 18, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

LEP-related disorder Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Jun 21, 2022

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.058
BayesDel_addAF	Benign	-0.41	T
BayesDel_noAF	Benign	-0.36
CADD	Benign	1.2
DANN	Benign	0.45
DEOGEN2	Uncertain	0.72	D
Eigen	Benign	-1.0
Eigen_PC	Benign	-1.0
FATHMM_MKL	Benign	0.022	N
LIST_S2	Benign	0.83	T
M_CAP	Benign	0.0092	T
MetaRNN	Benign	0.010	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.99	L
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.43	T
PROVEAN	Uncertain	-2.9	D
REVEL	Benign	0.11
Sift	Benign	0.18	T
Sift4G	Benign	0.21	T
Polyphen		0.019	B
Vest4		0.31
MVP		0.68
MPC		0.65
ClinPred		0.0047	T
GERP RS		1.1
Varity_R		0.083
gMVP		0.77

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: rs148407750; hg19: chr7-127892124;