NM_002834.5:c.217_218delACinsCT

Variant names:

• chr12-112450397-AC-CT
• rs397516802
• NM_002834.5:c.217_218delACinsCT

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM1 PM2 PM5 PP2 PP3 PP5_Very_Strong

The NM_002834.5(PTPN11):​c.217_218delACinsCT​(p.Thr73Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T73I) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PTPN11 NM_002834.5 missense
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 9.31

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 16 ACMG points.

• PM1: In a strand (size 3) in uniprot entity PTN11_HUMAN there are 13 pathogenic changes around while only 0 benign (100%) 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 chr12-112450398-C-T is described in Lovd as [Likely_pathogenic].
• PP2: Missense variant in the PTPN11 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 131 curated pathogenic missense variants (we use a threshold of 10). The gene has 13 curated benign missense variants. Gene score misZ: 3.1293 (above the threshold of 3.09). Trascript score misZ: 4.9438 (above the threshold of 3.09). GenCC associations: The gene is linked to 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: No computational evidence supports a deleterious effect, but strongly conserved according to phyloP
• PP5: Variant 12-112450397-AC-CT is Pathogenic according to our data. Variant chr12-112450397-AC-CT is described in ClinVar as [Pathogenic]. Clinvar id is 44604.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PTPN11	NM_002834.5	c.217_218delACinsCT	p.Thr73Leu	missense_variant		ENST00000351677.7	NP_002825.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PTPN11	ENST00000351677.7	c.217_218delACinsCT	p.Thr73Leu	missense_variant		1	NM_002834.5	ENSP00000340944.3
PTPN11	ENST00000635625.1	c.217_218delACinsCT	p.Thr73Leu	missense_variant		5		ENSP00000489597.1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Noonan syndrome 1 Pathogenic:1

Feb 14, 2023

Genomic Medicine Lab, University of California San Francisco

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Noonan syndrome Pathogenic:1

Apr 02, 2013

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The Thr73Leu variant in PTPN11 has previously been reported in the literature in one individual with clinical features of Noonan syndrome where it was reported to have occurred de novo (Ezquieta 2012). This variant was not identified in ei ther parent of this individual and therefore likely occurred de novo, assuming t hat non-medical explanations including alternate paternity or undisclosed adopti on have been ruled out In addition, a different amino acid change at this locati on (Thr73Ile) has previously been reported in the literature in many individuals with Noonan syndrome and Noonan syndrome with Juvenile myelomonocytic leukemia or myelodysplasia (Tartaglia 2003, Kratz 2005, Tartaglia 2006, Jongmans 2005) an d is classified as pathogenic in our laboratory. The evidence above taken togeth er supports that this variant is disease causing and responsible for Noonan synd rome and possibly Juvenile myelomonocytic leukemia or myelodysplasia in this ind ividual. In summary, this variant meets our criteria to be classified as pathoge nic (http://pcpgm.partners.org/LMM). -

Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs397516802; hg19: chr12-112888201;