NM_001100420.2:c.*4043G>A

Variant names:

• chr21-17789372-C-T
• rs243609
• NM_001100420.2:c.*4043G>A

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_001100420.2(C21orf91):​c.*4043G>A variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.471 in 151,718 control chromosomes in the GnomAD database, including 16,968 homozygotes. 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: 𝑓 0.47 (16968 hom., cov: 31)
  • Failed GnomAD Quality Control
• Consequence: C21orf91 NM_001100420.2 3_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.851
• Publications: 10 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]

C21orf91-OT1 (HGNC:16729): (C21orf91 overlapping transcript 1)

ENSG00000244676 (HGNC:):

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.84).
• BA1: GnomAd4 highest subpopulation (SAS) allele frequency at 95% confidence interval = 0.537 is higher than 0.05.

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.*4043G>A		3_prime_UTR	Exon 5 of 5	NP_001093890.1
	C21orf91	NM_017447.4		c.*4043G>A		3_prime_UTR	Exon 5 of 5	NP_059143.3
	C21orf91	NM_001100421.2		c.*4208G>A		3_prime_UTR	Exon 4 of 4	NP_001093891.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	C21orf91	ENST00000284881.9	TSL:2 MANE Select	c.*4043G>A		3_prime_UTR	Exon 5 of 5	ENSP00000284881.4	Q9NYK6-1
	C21orf91-OT1	ENST00000430401.5	TSL:1	n.34-2162G>A		intron	N/A
	C21orf91-OT1	ENST00000439392.1	TSL:1	n.34-2162G>A		intron	N/A

Frequencies

GnomAD3 genomes AF: 0.471 AC: 71427 AN: 151600 Hom.: 16951 Cov.: 31

Gnomad AFR AF: 0.438

Gnomad AMI AF: 0.570

Gnomad AMR AF: 0.467

Gnomad ASJ AF: 0.506

Gnomad EAS AF: 0.513

Gnomad SAS AF: 0.555

Gnomad FIN AF: 0.484

Gnomad MID AF: 0.579

Gnomad NFE AF: 0.477

Gnomad OTH AF: 0.498

GnomAD4 exome Data not reliable, filtered out with message: AC0 AC: 0 AN: 0 Hom.: 0 Cov.: 0 AC XY: 0 AN XY: 0

African (AFR) AC: 0 AN: 0

American (AMR) AC: 0 AN: 0

Ashkenazi Jewish (ASJ) AC: 0 AN: 0

East Asian (EAS) AC: 0 AN: 0

South Asian (SAS) AC: 0 AN: 0

European-Finnish (FIN) AC: 0 AN: 0

Middle Eastern (MID) AC: 0 AN: 0

European-Non Finnish (NFE) AC: 0 AN: 0

Other (OTH) AC: 0 AN: 0

GnomAD4 genome AF: 0.471 AC: 71493 AN: 151718 Hom.: 16968 Cov.: 31 AF XY: 0.474 AC XY: 35138 AN XY: 74132

African (AFR) AF: 0.439 AC: 18126 AN: 41326

American (AMR) AF: 0.466 AC: 7114 AN: 15254

Ashkenazi Jewish (ASJ) AF: 0.506 AC: 1757 AN: 3470

East Asian (EAS) AF: 0.514 AC: 2644 AN: 5148

South Asian (SAS) AF: 0.555 AC: 2662 AN: 4798

European-Finnish (FIN) AF: 0.484 AC: 5082 AN: 10494

Middle Eastern (MID) AF: 0.575 AC: 169 AN: 294

European-Non Finnish (NFE) AF: 0.477 AC: 32368 AN: 67926

Other (OTH) AF: 0.501 AC: 1051 AN: 2096

Alfa AF: 0.472 Hom.: 64418

Bravo AF: 0.467

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.84
CADD	Benign	0.35
DANN	Benign	0.63
PhyloP100		-0.85
Mutation Taster		=100/0	polymorphism (auto)

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: rs243609; hg19: chr21-19161689;