22-21788739-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM1 PM2 PP2

The NM_002745.5(MAPK1):c.679A>G(p.Ile227Val) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,461,822 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: MAPK1 NM_002745.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.90

Genes affected

MAPK1 (HGNC:6871): (mitogen-activated protein kinase 1) This gene encodes a member of the MAP kinase family. MAP kinases, also known as extracellular signal-regulated kinases (ERKs), act as an integration point for multiple biochemical signals, and are involved in a wide variety of cellular processes such as proliferation, differentiation, transcription regulation and development. The activation of this kinase requires its phosphorylation by upstream kinases. Upon activation, this kinase translocates to the nucleus of the stimulated cells, where it phosphorylates nuclear targets. One study also suggests that this protein acts as a transcriptional repressor independent of its kinase activity. The encoded protein has been identified as a moonlighting protein based on its ability to perform mechanistically distinct functions. Two alternatively spliced transcript variants encoding the same protein, but differing in the UTRs, have been reported for this gene. [provided by RefSeq, Jan 2014]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM1: In a domain Protein kinase (size 288) in uniprot entity MK01_HUMAN there are 9 pathogenic changes around while only 1 benign (90%) in NM_002745.5
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, MAPK1

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MAPK1	NM_002745.5	c.679A>G	p.Ile227Val	missense_variant	5/9	ENST00000215832.11
MAPK1	NM_138957.3	c.679A>G	p.Ile227Val	missense_variant	5/8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MAPK1	ENST00000215832.11	c.679A>G	p.Ile227Val	missense_variant	5/9	1	NM_002745.5	P1
MAPK1	ENST00000398822.7	c.679A>G	p.Ile227Val	missense_variant	5/8	1		P1
MAPK1	ENST00000544786.1	c.679A>G	p.Ile227Val	missense_variant	5/7	1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461822 Hom.: 0 Cov.: 30 AF XY: 0.00000138 AC XY: 1 AN XY: 727216

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: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

EpiCase AF: 0.00

EpiControl AF: 0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

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

Sep 15, 2023

Variant summary: MAPK1 c.679A>G (p.Ile227Val) results in a conservative amino acid change located in the Protein kinase domain (IPR000719) of the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. The variant was absent in 251340 control chromosomes (gnomAD). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. To our knowledge, no occurrence of c.679A>G in individuals affected with Noonan Syndrome 13 and no experimental evidence demonstrating its impact on protein function have been reported. No submitters have cited clinical-significance assessments for this variant to ClinVar after 2014. Based on the evidence outlined above, the variant was classified as uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Uncertain	0.029	T
BayesDel_noAF	Benign	-0.20
Cadd	Uncertain	25
Dann	Uncertain	1.0
DEOGEN2	Benign	0.25	T;T;.
Eigen	Uncertain	0.36
Eigen_PC	Uncertain	0.46
FATHMM_MKL	Uncertain	0.97	D
M_CAP	Benign	0.012	T
MetaRNN	Uncertain	0.49	T;T;T
MetaSVM	Benign	-0.54	T
MutationAssessor	Benign	0.34	N;N;N
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.71	T
PROVEAN	Benign	-0.90	N;N;N
REVEL	Benign	0.19
Sift	Uncertain	0.0020	D;D;D
Sift4G	Uncertain	0.0090	D;D;D
Polyphen		0.59	P;P;.
Vest4		0.48
MutPred		0.56		Loss of catalytic residue at P229 (P = 0.0307);Loss of catalytic residue at P229 (P = 0.0307);Loss of catalytic residue at P229 (P = 0.0307);
MVP		0.75
MPC		1.3
ClinPred		0.73	D
GERP RS		5.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.7
Varity_R		0.78
gMVP		0.79

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: rs2068913661; hg19: chr22-22143028;