21-21138436-A-C

Variant names:

• chr21-21138436-A-C
• rs2826689
• NM_004540.5:c.55+139818A>C

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_004540.5(NCAM2):​c.55+139818A>C variant causes a intron 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. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: NCAM2 NM_004540.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.198
• Publications: 1 publications found

Genes affected

NCAM2 (HGNC:7657): (neural cell adhesion molecule 2) The protein encoded by this gene belongs to the immunoglobulin superfamily. It is a type I membrane protein and may function in selective fasciculation and zone-to-zone projection of the primary olfactory axons. [provided by RefSeq, Jul 2008]

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.87).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004540.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NCAM2	NM_004540.5	MANE Select	c.55+139818A>C		intron	N/A	NP_004531.2
	NCAM2	NM_001352592.2		c.-21-72105A>C		intron	N/A	NP_001339521.1
	NCAM2	NM_001352591.2		c.55+139818A>C		intron	N/A	NP_001339520.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NCAM2	ENST00000400546.6	TSL:1 MANE Select	c.55+139818A>C		intron	N/A	ENSP00000383392.1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.87
CADD	Benign	4.2
DANN	Benign	0.31
PhyloP100		0.20

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: rs2826689; hg19: chr21-22510754;