18-74556342-C-A

Variant names:

• chr18-74556342-C-A
• rs773767191
• NM_032649.6:c.29C>A

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_032649.6(CNDP1):​c.29C>A​(p.Ala10Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,508 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/20 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. A10V) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: CNDP1 NM_032649.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.985
• Publications: 0 publications found

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

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.14556035).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_032649.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CNDP1	NM_032649.6	MANE Select	c.29C>A	p.Ala10Glu	missense	Exon 2 of 12	NP_116038.4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CNDP1	ENST00000358821.8	TSL:1 MANE Select	c.29C>A	p.Ala10Glu	missense	Exon 2 of 12	ENSP00000351682.3	Q96KN2
	CNDP1	ENST00000864762.1		c.29C>A	p.Ala10Glu	missense	Exon 2 of 12	ENSP00000534821.1
	CNDP1	ENST00000954332.1		c.29C>A	p.Ala10Glu	missense	Exon 2 of 12	ENSP00000624391.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461508 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 727060

African (AFR) AF: 0.00 AC: 0 AN: 33468

American (AMR) AF: 0.00 AC: 0 AN: 44642

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26122

East Asian (EAS) AF: 0.00 AC: 0 AN: 39686

South Asian (SAS) AF: 0.00 AC: 0 AN: 86182

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53336

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5762

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1111922

Other (OTH) AF: 0.00 AC: 0 AN: 60388

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.25
BayesDel_addAF	Benign	-0.29	T
BayesDel_noAF	Benign	-0.66
CADD	Benign	15
DANN	Benign	0.94
Eigen	Benign	-0.69
Eigen_PC	Benign	-0.71
FATHMM_MKL	Benign	0.13	N
M_CAP	Benign	0.0064	T
MetaRNN	Benign	0.15	T
MetaSVM	Benign	-1.0	T
PhyloP100		0.98
PrimateAI	Benign	0.43	T
PROVEAN	Benign	-0.56	N
REVEL	Benign	0.12
Sift	Uncertain	0.0040	D
Sift4G	Uncertain	0.058	T
Vest4		0.26
MutPred		0.52		Gain of disorder (P = 0.0368)
MVP		0.26
MPC		0.18
ClinPred		0.17	T
GERP RS		3.5
gMVP		0.46

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

Other links and lift over

dbSNP: rs773767191; hg19: chr18-72223577;