chr2-174944942-T-A

Variant names:

• chr2-174944942-T-A
• rs121912792
• NM_001822.7:c.60A>T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP5

The NM_001822.7(CHN1):​c.60A>T​(p.Leu20Phe) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: CHN1 NM_001822.7 missense, splice_region
• Scores: Splicing: ADA: 0.00003479
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: -0.341

Genes affected

CHN1 (HGNC:1943): (chimerin 1) This gene encodes GTPase-activating protein for ras-related p21-rac and a phorbol ester receptor. It is predominantly expressed in neurons, and plays an important role in neuronal signal-transduction mechanisms. Mutations in this gene are associated with Duane's retraction syndrome 2 (DURS2). Alternatively spliced transcript variants encoding different isoforms have been described for this gene. [provided by RefSeq, Apr 2011]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 2-174944942-T-A is Pathogenic according to our data. Variant chr2-174944942-T-A is described in ClinVar as [Pathogenic]. Clinvar id is 17550.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHN1	NM_001822.7	c.60A>T	p.Leu20Phe	missense_variant, splice_region_variant	Exon 3 of 13	ENST00000409900.9	NP_001813.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CHN1	ENST00000409900.9	c.60A>T	p.Leu20Phe	missense_variant, splice_region_variant	Exon 3 of 13	1	NM_001822.7	ENSP00000386741.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Duane retraction syndrome 2 Pathogenic:1

Aug 08, 2008

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.22	D
BayesDel_noAF	Uncertain	0.080
CADD	Benign	18
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.52	D;.
Eigen	Benign	-0.16
Eigen_PC	Benign	-0.32
FATHMM_MKL	Benign	0.49	N
LIST_S2	Uncertain	0.95	D;D
M_CAP	Uncertain	0.13	D
MetaRNN	Uncertain	0.55	D;D
MetaSVM	Uncertain	-0.073	T
MutationAssessor	Uncertain	2.7	M;M
PrimateAI	Pathogenic	0.80	D
PROVEAN	Uncertain	-2.5	N;N
REVEL	Uncertain	0.49
Sift	Uncertain	0.0020	D;D
Sift4G	Uncertain	0.0030	D;D
Polyphen		0.97	D;.
Vest4		0.65
MutPred		0.58		Loss of helix (P = 0.1299);Loss of helix (P = 0.1299);
MVP		0.84
MPC		0.60
ClinPred		0.91	D
GERP RS		-6.5
Varity_R		0.52
gMVP		0.53

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.000035
dbscSNV1_RF	Benign	0.17
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: rs121912792; hg19: chr2-175809670;