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Fetal anomalies

Gene: MAPK1

Green List (high evidence)
MAPK1 (mitogen-activated protein kinase 1)
EnsemblGeneIds (GRCh38): ENSG00000100030
EnsemblGeneIds (GRCh37): ENSG00000100030
OMIM: 176948, Gene2Phenotype
MAPK1 is in 4 panels

4 reviews

Arina Puzriakova (Genomics England Curator)

Green List (high evidence)

There is sufficient evidence to promote this gene to Green at the next GMS panel update, inline with the recent review by the R21 Clinical Oversight Group.
Created: 5 Sep 2025, 4:41 p.m. | Last Modified: 5 Sep 2025, 4:41 p.m.
Panel Version: 6.29
Created: 5 Sep 2025, 4:41 p.m.
Last Modified: 5 Sep 2025, 4:41 p.m.
Panel version: 6.29

Sarah Graham (West Midlands Regional Genetics Laboratory, Birmingham Women's and Children’s NHS Foundation Trust)

Green List (high evidence)

This gene and phenotype were reviewed during meetings in June & July 2025. The meetings included representatives of the North Thames and Central & South R21 testing GLHs and from the R21 Clinical Oversight Group. Clinical review and curation was performed by Natalie Chandler & Elizabeth Scotchman (North Thames GLH), Natalie Bibb, Stephanie Allen & Sarah Graham (Central & South GLH) and Alice Gardham, Esther Kinning, Vicki Harrison, Anna DeBurca, Natalie Canham, Elizabeth Wall, Sunayna Best, Soo-Mi Park & Sahar Mansour (R21 Clinical Oversight Group).
Created: 5 Sep 2025, 4:31 p.m. | Last Modified: 5 Sep 2025, 4:31 p.m.
Panel Version: 6.28
7 cases in 32721402 with de novo missense variants (described in previous review) plus additional report of patient with de novo p.His80Tyr and failure to thrive, neurodevelopmental delay, facial features and immunodeficiency, no antenatal complications (40257485). Congenital heart defects in 4 cases, raised nuchal in 1, bilateral talipes in 1. Other rasopathy genes are all on the FA panel.
Created: 5 Sep 2025, 2:55 p.m. | Last Modified: 5 Sep 2025, 2:55 p.m.
Panel Version: 6.24

Mode of inheritance
MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted

Phenotypes
Noonan syndrome 13

Publications

Mode of pathogenicity
Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments

Created: 5 Sep 2025, 2:55 p.m.
Last Modified: 5 Sep 2025, 2:55 p.m.
Panel version: 6.28

Achchuthan Shanmugasundram (Genomics England Curator)

Green List (high evidence)

The rating of this gene has been updated to green following NHS Genomic Medicine Service approval.
Created: 12 Dec 2025, 3:10 p.m. | Last Modified: 12 Dec 2025, 3:10 p.m.
Panel Version: 6.120
This gene and phenotype were reviewed during meetings between November 2023 & July 2024. The meetings included representatives of the North Thames and Central & South R21 testing GLHs and from the R21 Clinical Oversight Group. Clinical review and curation was performed by Natalie Chandler, Alison Male and Lyn Chitty (North Thames GLH), Stephanie Allen, Natalie Bibb, Esther Kinning and Denise Williams (Central & South GLH) and Natalie Canham, Anna De Burca and Samantha Doyle R21 Clinical Oversight Group.
Created: 29 Aug 2024, 8:33 p.m. | Last Modified: 29 Aug 2024, 8:33 p.m.
Panel Version: 4.36
Created: 29 Aug 2024, 8:33 p.m.
Last Modified: 29 Aug 2024, 8:33 p.m.
Panel version: 6.120

Natalie Chandler (North Thames GLH)

I don't know

Green in ID panel only. Motta et al (2020 - PMID:32721402) report on 7 unrelated individuals harboring de novo missense MAPK1 pathogenic variants. The phenotype corresponded to a neurodevelopmental disorder and - as the authors comment - consistently included DD, ID , behavioral problems. Postnatal growth delay was observed in approximately half. Hypertelorism, ptosis, downslant of palpebral fissures, wide nasal bridge as low-set/posteriorly rotated ears were among the facial features observed (each in 3 or more subjects within this cohort). Together with short/webbed neck and abnormalities of skin (lentigines / CAL spots) and growth delay these led to clinical suspicion of Noonans or disorder of the same pathway in some. Congenital heart defects (ASD, mitral valve insufficiency, though not cardiomyopathy) occurred in 4/7. Bleeding diathesis and lymphedema were reported only once. MAPK1 encodes the mitogen-activated protein kinase 1 (also known as ERK2) a serine/threonine kinase of the RAS-RAF-MEK-(MAPK/)ERK pathway. 5/6 cases pregnancy uneventful 1/6 increased nuchal. 1/6 presented at birth with bilateral clubfeet, hypotonia, ptosis and cryptorchidism. Others all presented to clilnic aged 2-3. Suggest amber as new noonans gene so may link to hydrops with more cases.
Created: 29 Aug 2024, 8:07 p.m. | Last Modified: 29 Aug 2024, 8:07 p.m.
Panel Version: 4.35

Mode of inheritance
MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted

Phenotypes
Noonan syndrome 13, OMIM:619087

Publications

Created: 29 Aug 2024, 8:07 p.m.
Last Modified: 29 Aug 2024, 8:07 p.m.
Panel version: 4.35

Details

Mode of Inheritance
MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Sources
  • Expert Review Green
  • NHS GMS
Phenotypes
  • Noonan syndrome 13, OMIM:619087
OMIM
176948
Clinvar variants
Variants in MAPK1
Penetrance
None
Publications
Mode of Pathogenicity
Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments
Panels with this gene

History Filter Activity

16 Dec 2025, Gel status: 3

Removed Tag, Removed Tag

Achchuthan Shanmugasundram (Genomics England Curator)

Tag Q3_25_promote_green was removed from gene: MAPK1. Tag Q3_25_NHS_review was removed from gene: MAPK1.

12 Dec 2025, Gel status: 3

Added New Source, Status Update

Arina Puzriakova (Genomics England Curator)

Source Expert Review Green was added to MAPK1. Rating Changed from Amber List (moderate evidence) to Green List (high evidence)

8 Sep 2025, Gel status: 2

Set Phenotypes

Arina Puzriakova (Genomics England Curator)

Phenotypes for gene: MAPK1 were changed from Noonan syndrome 13; Noonan syndrome 13, OMIM:619087 to Noonan syndrome 13, OMIM:619087

8 Sep 2025, Gel status: 2

Added Tag, Added Tag

Arina Puzriakova (Genomics England Curator)

Tag Q3_25_promote_green tag was added to gene: MAPK1. Tag Q3_25_NHS_review tag was added to gene: MAPK1.

5 Sep 2025, Gel status: 2

Set mode of pathogenicity, Set Phenotypes, Set publications

Arina Puzriakova (Genomics England Curator)

Mode of pathogenicity for gene MAPK1 was changed from to Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments Added phenotypes Noonan syndrome 13 for gene: MAPK1 Publications for gene: MAPK1 were updated from 32721402 to 32721402; 40257485

29 Aug 2024, Gel status: 2

Created, Added New Source, Set mode of inheritance, Set publications, Set Phenotypes

Achchuthan Shanmugasundram (Genomics England Curator)

gene: MAPK1 was added gene: MAPK1 was added to Fetal anomalies. Sources: Expert Review Amber,NHS GMS Mode of inheritance for gene: MAPK1 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for gene: MAPK1 were set to 32721402 Phenotypes for gene: MAPK1 were set to Noonan syndrome 13, OMIM:619087