chr17-41973500-C-T

Position:

• chr17-41973500-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_033133.5(CNP):​c.842C>T​(p.Ala281Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: CNP NM_033133.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.51

Genes affected

CNP (HGNC:2158): (2',3'-cyclic nucleotide 3' phosphodiesterase) Predicted to enable 2',3'-cyclic-nucleotide 3'-phosphodiesterase activity. Involved in substantia nigra development. Located in several cellular components, including extracellular space; microtubule; and plasma membrane. Implicated in hypomyelinating leukodystrophy 20; multiple sclerosis; and schizophrenia. Biomarker of alcoholic liver cirrhosis; multiple sclerosis; and restless legs syndrome. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.19033101).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CNP	NM_033133.5	c.842C>T	p.Ala281Val	missense_variant	4/4	ENST00000393892.8
CNP	NM_001330216.2	c.782C>T	p.Ala261Val	missense_variant	4/4
CNP	XM_011524340.3	c.782C>T	p.Ala261Val	missense_variant	4/4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CNP	ENST00000393892.8	c.842C>T	p.Ala281Val	missense_variant	4/4	1	NM_033133.5	P3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Leukodystrophy, hypomyelinating, 20 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Neuberg Centre For Genomic Medicine, NCGM

-

The missense variant p.A281V in CNP (NM_033133.5) has not been reported previously as a pathogenic variant nor as a benign variant, to our knowledge. The p.A281V variant is novel (not in any individuals) in gnomAD Exomes and is novel (not in any individuals) in 1000 Genomes. There is a small physicochemical difference between alanine and valine, which is not likely to impact secondary protein structure as these residues share similar properties. This variant has not been reported to the ClinVar database. In silico tools predict the variant to be tolerated. The residue is conserved across species. The amino acid change p.Ala281Val in CNP is predicted as conserved by GERP++ and PhyloP across 100 vertebrates. For these reasons, this variant has been classified as Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.46
BayesDel_addAF	Benign	-0.20	T
BayesDel_noAF	Benign	-0.53
CADD	Benign	22
DANN	Benign	0.97
DEOGEN2	Benign	0.12	T;.
Eigen	Benign	-0.11
Eigen_PC	Benign	0.030
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Uncertain	0.89	D;D
M_CAP	Benign	0.010	T
MetaRNN	Benign	0.19	T;T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	2.0	M;.
MutationTaster	Benign	0.79	D;D;N;N
PrimateAI	Benign	0.41	T
PROVEAN	Benign	-0.90	N;N
REVEL	Benign	0.053
Sift	Benign	0.24	T;T
Sift4G	Benign	0.55	T;T
Polyphen		0.45	B;.
Vest4		0.042
MutPred		0.63		Loss of helix (P = 0.0196);.;
MVP		0.43
MPC		0.54
ClinPred		0.62	D
GERP RS		3.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.10
gMVP		0.54

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr17-40125518;