chr12-112488465-A-C

Position:

• chr12-112488465-A-C

Variant summary

Our verdict is Pathogenic. Variant got 19 ACMG points: 19P and 0B. PM1 PM2 PM5 PP2 PP3_Strong PP5_Very_Strong

The NM_002834.5(PTPN11):​c.1402A>C​(p.Thr468Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 13/22 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T468M) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PTPN11 NM_002834.5 missense
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:5
• Conservation: PhyloP100: 8.95

Genes affected

PTPN11 (HGNC:9644): (protein tyrosine phosphatase non-receptor type 11) The protein encoded by this gene is a member of the protein tyrosine phosphatase (PTP) family. PTPs are known to be signaling molecules that regulate a variety of cellular processes including cell growth, differentiation, mitotic cycle, and oncogenic transformation. This PTP contains two tandem Src homology-2 domains, which function as phospho-tyrosine binding domains and mediate the interaction of this PTP with its substrates. This PTP is widely expressed in most tissues and plays a regulatory role in various cell signaling events that are important for a diversity of cell functions, such as mitogenic activation, metabolic control, transcription regulation, and cell migration. Mutations in this gene are a cause of Noonan syndrome as well as acute myeloid leukemia. [provided by RefSeq, Aug 2016]

ACMG classification

Verdict is Pathogenic. Variant got 19 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 7 uncertain in NM_002834.5
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr12-112488466-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 13331.Status of the report is reviewed_by_expert_panel, 3 stars.
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), PTPN11. . Gene score misZ 3.1293 (greater than the threshold 3.09). Trascript score misZ 4.9438 (greater than threshold 3.09). GenCC has associacion of gene with Noonan syndrome and Noonan-related syndrome, Noonan syndrome with multiple lentigines, metachondromatosis, Noonan syndrome 1, Noonan syndrome, cardiofaciocutaneous syndrome, LEOPARD syndrome 1, Costello syndrome.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.993
• PP5: Variant 12-112488465-A-C is Pathogenic according to our data. Variant chr12-112488465-A-C is described in ClinVar as [Pathogenic]. Clinvar id is 40547.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PTPN11	NM_002834.5	c.1402A>C	p.Thr468Pro	missense_variant	12/16	ENST00000351677.7
PTPN11	NM_001330437.2	c.1414A>C	p.Thr472Pro	missense_variant	12/16
PTPN11	NM_001374625.1	c.1399A>C	p.Thr467Pro	missense_variant	12/16
PTPN11	XM_011538613.3	c.1411A>C	p.Thr471Pro	missense_variant	12/16

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PTPN11	ENST00000351677.7	c.1402A>C	p.Thr468Pro	missense_variant	12/16	1	NM_002834.5	A1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Noonan syndrome with multiple lentigines Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Dec 20, 2021

Variant summary: PTPN11 c.1402A>C (p.Thr468Pro) results in a non-conservative amino acid change located in the Tyrosine-specific protein phosphatase, PTPase domain of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant was absent in 251186 control chromosomes. c.1402A>C has been reported in the literature in individuals affected with Leopard Syndrome (e.g. Limongelli_2007, Seishima_2007). These data indicate that the variant may be associated with disease. At least one publication reports experimental evidence evaluating an impact on protein function and showed that this variant increased melanin synthesis (Motegi_2015). Two clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. Both laboratories classified the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Feb 12, 2021

Published functional studies demonstrate that the variant may enhance melanin synthesis (Motegi et al., 2015); Not observed in large population cohorts (Lek et al., 2016); In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect; The majority of missense variants in this gene are considered pathogenic (Stenson et al., 2014); This variant is associated with the following publications: (PMID: 25917897, 24803665, 30417923, 17927788) -

Cardiovascular phenotype Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 23, 2024

The p.T468P pathogenic mutation (also known as c.1402A>C), located in coding exon 12 of the PTPN11 gene, results from an A to C substitution at nucleotide position 1402. The threonine at codon 468 is replaced by proline, an amino acid with highly similar properties. This mutation has been identified in individuals with Noonan syndrome with multiple lentigines, including a de novo occurrence (Seishima M, et al. Br. J. Dermatol. 2007 Dec; 157(6):1297-9; Motegi S, et al. Acta Derm. Venereol. 2015 Nov; 95(8):978-84). This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Based on the supporting evidence, this variant is expected to be causative of PTPN11-related RASopathy; however, its clinical significance for metachondromatosis is unclear. -

RASopathy Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 30, 2022

For these reasons, this variant has been classified as Pathogenic. This variant disrupts the p.Thr468 amino acid residue in PTPN11. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 12058348, 16377799, 18372317). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. Experimental studies have shown that this missense change affects PTPN11 function (PMID: 25917897). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt PTPN11 protein function. ClinVar contains an entry for this variant (Variation ID: 40547). This missense change has been observed in individuals with Noonan Syndrome with Multiple Lentigines (NSML) (also known as LEOPARD syndrome) (PMID: 17927788, 25917897). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces threonine, which is neutral and polar, with proline, which is neutral and non-polar, at codon 468 of the PTPN11 protein (p.Thr468Pro). -

Noonan syndrome and Noonan-related syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Genome Diagnostics Laboratory, The Hospital for Sick Children

Oct 02, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
CardioboostCm	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.58	D
BayesDel_noAF	Pathogenic	0.59
CADD	Pathogenic	30
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.96	.;D;.
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.90
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.93	D;D;D
M_CAP	Pathogenic	0.79	D
MetaRNN	Pathogenic	0.99	D;D;D
MetaSVM	Pathogenic	0.93	D
MutationAssessor	Pathogenic	4.9	.;H;.
MutationTaster	Benign	1.0	D
PrimateAI	Pathogenic	0.86	D
PROVEAN	Pathogenic	-5.6	D;.;.
REVEL	Pathogenic	0.99
Sift	Uncertain	0.0010	D;.;.
Sift4G	Pathogenic	0.0010	D;D;D
Polyphen		1.0	D;.;.
Vest4		0.91
MutPred		0.96		Loss of catalytic residue at T468 (P = 0.0836);.;.;
MVP		0.99
MPC		2.2
ClinPred		1.0	D
GERP RS		5.0
Varity_R		0.99
gMVP		0.99

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: rs397507537; hg19: chr12-112926269;