1-155910695-T-G

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM1PM2PM5PP3_ModeratePP5_Very_Strong

The NM_006912.6(RIT1):​c.67A>C​(p.Lys23Gln) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. K23N) has been classified as Pathogenic.

Frequency

Genomes: not found (cov: 33)

Consequence

RIT1
NM_006912.6 missense

Scores

8
10
1

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:5U:1

Conservation

PhyloP100: 4.48
Variant links:
Genes affected
RIT1 (HGNC:10023): (Ras like without CAAX 1) This gene encodes a member of a subfamily of Ras-related GTPases. The encoded protein is involved in regulating p38 MAPK-dependent signaling cascades related to cellular stress. This protein also cooperates with nerve growth factor to promote neuronal development and regeneration. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Feb 2012]

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ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 16 ACMG points.

PM1
In a strand (size 5) in uniprot entity RIT1_HUMAN there are 4 pathogenic changes around while only 0 benign (100%) in NM_006912.6
PM2
Very rare variant in population databases, with high coverage;
PM5
Other missense variant is known to change same aminoacid residue: Variant chr1-155910693-T-G is described in ClinVar as [Pathogenic]. Clinvar id is 581105.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
PP3
MetaRNN computational evidence supports a deleterious effect, 0.894
PP5
Variant 1-155910695-T-G is Pathogenic according to our data. Variant chr1-155910695-T-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 224122.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
RIT1NM_006912.6 linkc.67A>C p.Lys23Gln missense_variant Exon 2 of 6 ENST00000368323.8 NP_008843.1 Q92963-1
RIT1NM_001256821.2 linkc.118A>C p.Lys40Gln missense_variant Exon 2 of 6 NP_001243750.1 Q92963-3
RIT1NM_001256820.2 linkc.-2-189A>C intron_variant Intron 1 of 4 NP_001243749.1 Q92963-2

Ensembl

Gene Transcript HGVSc HGVSp Effect Exon rank TSL MANE Protein Appris UniProt
RIT1ENST00000368323.8 linkc.67A>C p.Lys23Gln missense_variant Exon 2 of 6 1 NM_006912.6 ENSP00000357306.3 Q92963-1

Frequencies

GnomAD3 genomes
Cov.:
33
GnomAD4 exome
Cov.:
32
GnomAD4 genome
Cov.:
33

ClinVar

Significance: Pathogenic/Likely pathogenic
Submissions summary: Pathogenic:5Uncertain:1
Revision: criteria provided, multiple submitters, no conflicts
LINK: link

Submissions by phenotype

Noonan syndrome 8 Pathogenic:2
Jun 09, 2015
HudsonAlpha Institute for Biotechnology, HudsonAlpha Institute for Biotechnology
Significance: Pathogenic
Review Status: criteria provided, single submitter
Collection Method: research

- -

Oct 27, 2024
Labcorp Genetics (formerly Invitae), Labcorp
Significance: Pathogenic
Review Status: criteria provided, single submitter
Collection Method: clinical testing

This sequence change replaces lysine, which is basic and polar, with glutamine, which is neutral and polar, at codon 23 of the RIT1 protein (p.Lys23Gln). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individuals with clinical features of Noonan syndrome (PMID: 28554332; internal data). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 224122). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is expected to disrupt RIT1 protein function with a positive predictive value of 95%. This variant disrupts the p.Lys23 amino acid residue in RIT1. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 26518681, 27101134, 29734338; internal data). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -

Hypertelorism;C0239340:Pedal edema;C0349588:Short stature;C0423110:Downslanted palpebral fissures Pathogenic:1
Jan 01, 2017
Centre for Mendelian Genomics, University Medical Centre Ljubljana
Significance: Likely pathogenic
Review Status: criteria provided, single submitter
Collection Method: clinical testing

- -

not provided Pathogenic:1
Dec 18, 2019
GeneDx
Significance: Likely pathogenic
Review Status: criteria provided, single submitter
Collection Method: clinical testing

Not observed in large population cohorts (Lek et al., 2016); In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect; This variant is associated with the following publications: (PMID: 26518681, 28554332) -

Cardiovascular phenotype Pathogenic:1
Aug 09, 2023
Ambry Genetics
Significance: Likely pathogenic
Review Status: criteria provided, single submitter
Collection Method: clinical testing

The p.K23Q variant (also known as c.67A>C), located in coding exon 1 of the RIT1 gene, results from an A to C substitution at nucleotide position 67. The lysine at codon 23 is replaced by glutamine, an amino acid with similar properties. This variant has been detected in individuals with features consistent with Noonan syndrome, including a de novo occurrence (Bowling KM et al. Genome Med, 2017 May;9:43; external communication). 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, the in silico prediction for this alteration is inconclusive. Based on the majority of available evidence to date, this variant is likely to be pathogenic. -

not specified Uncertain:1
Nov 15, 2016
Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine
Significance: Uncertain significance
Review Status: flagged submission
Collection Method: clinical testing

Variant classified as Uncertain Significance - Favor Pathogenic. The p.Lys40Gln variant in RIT1 has not been previously reported in individuals with clinical fe atures of a RASopathy and is absent from large population studies. However, anot her variant at the same position (p.Lys40Asn; reported as p.Lys23Asn on NM_00691 2.5) was identified as a de novo variant in 1 individual with Noonan syndrome (N emcikova 2015), suggesting changes at this position are not tolerated. Computati onal prediction tools and conservation analysis suggest that the p.Lys40Gln vari ant may impact the protein, though this information is not predictive enough to determine pathogenicity. In summary, while there is some suspicion for a pathoge nic role, the clinical significance of the p.Lys40Gln variant is uncertain. -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
0.87
BayesDel_addAF
Pathogenic
0.25
D
BayesDel_noAF
Uncertain
0.12
CADD
Pathogenic
28
DANN
Uncertain
0.99
DEOGEN2
Uncertain
0.61
D;.;.
Eigen
Uncertain
0.44
Eigen_PC
Uncertain
0.38
FATHMM_MKL
Uncertain
0.93
D
LIST_S2
Pathogenic
0.98
D;D;D
M_CAP
Pathogenic
0.61
D
MetaRNN
Pathogenic
0.89
D;D;D
MetaSVM
Uncertain
0.27
D
MutationAssessor
Pathogenic
3.3
M;.;.
PrimateAI
Pathogenic
0.82
D
PROVEAN
Uncertain
-3.4
D;D;.
REVEL
Pathogenic
0.79
Sift
Uncertain
0.0010
D;D;.
Sift4G
Uncertain
0.0020
D;D;.
Polyphen
0.99
D;.;.
Vest4
0.81
MutPred
0.73
Loss of methylation at K23 (P = 0.0045);.;Loss of methylation at K23 (P = 0.0045);
MVP
0.94
MPC
1.9
ClinPred
0.99
D
GERP RS
4.7
Varity_R
0.94
gMVP
0.98

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

Below is the list of publications found by LitVar. It may be empty.

Other links and lift over

dbSNP: rs869312687; hg19: chr1-155880486; API