chr21-17806954-C-G

Variant names:

• chr21-17806954-C-G
• rs2824499
• NM_001100420.2:c.128-9836G>C

Variant summary

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

The NM_001100420.2(C21orf91):​c.128-9836G>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: C21orf91 NM_001100420.2 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.0530
• Publications: 6 publications found

Genes affected

C21orf91 (HGNC:16459): (chromosome 21 open reading frame 91) Predicted to be involved in cerebral cortex neuron differentiation and positive regulation of dendritic spine development. [provided by Alliance of Genome Resources, Apr 2022]

ENSG00000244676 (HGNC:):

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=-0.84).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001100420.2. 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
	C21orf91	NM_001100420.2	MANE Select	c.128-9836G>C		intron	N/A	NP_001093890.1
	C21orf91	NM_017447.4		c.128-9836G>C		intron	N/A	NP_059143.3
	C21orf91	NM_001100421.2		c.128-9836G>C		intron	N/A	NP_001093891.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	C21orf91	ENST00000284881.9	TSL:2 MANE Select	c.128-9836G>C		intron	N/A	ENSP00000284881.4	Q9NYK6-1
	C21orf91	ENST00000400558.7	TSL:1	c.128-9836G>C		intron	N/A	ENSP00000383403.3	Q9NYK6-2
	C21orf91	ENST00000908059.1		c.128-9836G>C		intron	N/A	ENSP00000578118.1

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

Alfa AF: 0.00 Hom.: 9973

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.84
CADD	Benign	0.80
DANN	Benign	0.69
PhyloP100		-0.053

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: rs2824499; hg19: chr21-19179271;