18-74560889-G-C

Position:

• chr18-74560889-G-C

Variant summary

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

The NM_032649.6(CNDP1):​c.337G>C​(p.Val113Leu) 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. 6/8 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V113I) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 31)
• Consequence: CNDP1 NM_032649.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.223

Genes affected

CNDP1 (HGNC:20675): (carnosine dipeptidase 1) This gene encodes a member of the M20 metalloprotease family. The encoded protein is specifically expressed in the brain, is a homodimeric dipeptidase which was identified as human carnosinase. This gene contains trinucleotide (CTG) repeat length polymorphism in the coding region. [provided by RefSeq, Jul 2008]

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=0.08990604).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CNDP1	NM_032649.6	c.337G>C	p.Val113Leu	missense_variant	4/12	ENST00000358821.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CNDP1	ENST00000358821.8	c.337G>C	p.Val113Leu	missense_variant	4/12	1	NM_032649.6	P1
CNDP1	ENST00000582365.1	c.208G>C	p.Val70Leu	missense_variant	3/11	5
CNDP1	ENST00000585136.1	n.469-1158G>C		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.24
BayesDel_noAF	Benign	-0.82
CADD	Benign	2.0
MetaRNN	Benign	0.090	T;T
Sift4G	Uncertain	0.028	D;D
Vest4		0.14
gMVP		0.33

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs4263028; hg19: chr18-72228124;