19-4101121-G-A

Position:

• chr19-4101121-G-A

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 0P and 8B. BA1

This summary comes from the ClinGen Evidence Repository: The filtering allele frequency of the c.603C>T (p.Leu201=) variant in the MAP2K2 gene is 0.191% (18/6102) of African chromosomes by the Exome Aggregation Consortium, which is a high enough frequency to be classified as benign based on thresholds defined by the ClinGen RASopathy Expert Panel (BA1; PMID:29493581) LINK:https://erepo.genome.network/evrepo/ui/classification/CA137956/MONDO:0021060/004

• Frequency:
  • Genomes: 𝑓 0.00067 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00011 (0 hom.)
• Consequence: MAP2K2 NM_030662.4 synonymous
• Clinical Significance: Benign reviewed by expert panel B:9
• Conservation: PhyloP100: 0.577

Genes affected

MAP2K2 (HGNC:6842): (mitogen-activated protein kinase kinase 2) The protein encoded by this gene is a dual specificity protein kinase that belongs to the MAP kinase kinase family. This kinase is known to play a critical role in mitogen growth factor signal transduction. It phosphorylates and thus activates MAPK1/ERK2 and MAPK2/ERK3. The activation of this kinase itself is dependent on the Ser/Thr phosphorylation by MAP kinase kinase kinases. Mutations in this gene cause cardiofaciocutaneous syndrome (CFC syndrome), a disease characterized by heart defects, cognitive disability, and distinctive facial features similar to those found in Noonan syndrome. The inhibition or degradation of this kinase is also found to be involved in the pathogenesis of Yersinia and anthrax. A pseudogene, which is located on chromosome 7, has been identified for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Benign. Variant got -8 ACMG points.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MAP2K2	NM_030662.4	c.603C>T	p.Leu201=	synonymous_variant	6/11	ENST00000262948.10
MAP2K2	XM_006722799.3	c.603C>T	p.Leu201=	synonymous_variant	6/9
MAP2K2	XM_047439100.1	c.33C>T	p.Leu11=	synonymous_variant	4/9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MAP2K2	ENST00000262948.10	c.603C>T	p.Leu201=	synonymous_variant	6/11	1	NM_030662.4	P1

Frequencies

GnomAD3 genomes AF: 0.000671 AC: 102 AN: 152096 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00227

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000414

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000882

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000193 AC: 46 AN: 238866 Hom.: 0 AF XY: 0.000186 AC XY: 24 AN XY: 129280

Gnomad AFR exome AF: 0.00174

Gnomad AMR exome AF: 0.0000893

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000241

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000839

Gnomad OTH exome AF: 0.000170

GnomAD4 exome AF: 0.000113 AC: 164 AN: 1455872 Hom.: 0 Cov.: 54 AF XY: 0.000112 AC XY: 81 AN XY: 723642

Gnomad4 AFR exome AF: 0.00210

Gnomad4 AMR exome AF: 0.0000681

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000254

Gnomad4 SAS exome AF: 0.000118

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000640

Gnomad4 OTH exome AF: 0.000150

GnomAD4 genome AF: 0.000670 AC: 102 AN: 152214 Hom.: 0 Cov.: 32 AF XY: 0.000631 AC XY: 47 AN XY: 74446

Gnomad4 AFR AF: 0.00226

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000415

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000883

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000328 Hom.: 0

Bravo AF: 0.000574

ClinVar

Significance: Benign

Submissions summary: Benign:9

Revision: reviewed by expert panel

Submissions by phenotype

not specified Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Jan 05, 2009	- -
Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Jun 04, 2018	Variant summary: MAP2K2 c.603C>T alters a non-conserved nucleotide resulting in a synonymous change. 5/5 computational tools predict no significant impact on normal splicing. However, these predictions have yet to be confirmed by functional studies. The variant was observed with an allele frequency of 0.00028 in 265334 control chromosomes (gnomAD). The observed variant frequency within African control individuals in the gnomAD database is approximately 920-folds higher than the estimated maximal expected allele frequency for a pathogenic variant in MAP2K2 causing Noonan Syndrome and Related Conditions phenotype (2.5e-06), strongly suggesting that the variant is a benign polymorphism found primarily in populations of African origin. To our knowledge, no occurrence of c.603C>T in individuals affected with Noonan Syndrome and Related Conditions and no experimental evidence demonstrating its impact on protein function have been reported. A co-occurrence with other pathogenic variant has been reported (PTPN11 c.182A>G, p.Asp61Gly) in an internal specimen, providing supporting evidence for a benign role. Two ClinVar submissions from clinical diagnostic laboratories (evaluation after 2014) cite the variant as benign. Based on the evidence outlined above, the variant was classified as benign. -

not provided Benign:2

Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Dec 01, 2023	MAP2K2: BS1 -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 03, 2015	- -

RASopathy Benign:2

Benign, reviewed by expert panel	curation	ClinGen RASopathy Variant Curation Expert Panel	May 09, 2017	The filtering allele frequency of the c.603C>T (p.Leu201=) variant in the MAP2K2 gene is 0.191% (18/6102) of African chromosomes by the Exome Aggregation Consortium, which is a high enough frequency to be classified as benign based on thresholds defined by the ClinGen RASopathy Expert Panel (BA1; PMID:29493581) -
Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 31, 2024	- -

MAP2K2-related disorder Benign:1

Benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Jun 19, 2019

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

Cardiovascular phenotype Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 14, 2024

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Noonan syndrome and Noonan-related syndrome Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Genome Diagnostics Laboratory, The Hospital for Sick Children

Feb 01, 2019

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.53
CADD	Benign	13
DANN	Benign	0.77

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.22		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.22		Position offset: -12

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

Publications

LitVar

Other links and lift over

dbSNP: rs148291450; hg19: chr19-4101119;