22-20086031-G-C

Variant names:

• chr22-20086031-G-C
• rs768655560
• NM_022720.7:c.68G>C

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BP4_Moderate BS2

The NM_022720.7(DGCR8):​c.68G>C​(p.Arg23Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000821 in 1,461,330 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 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. R23Q) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000082 (0 hom.)
• Consequence: DGCR8 NM_022720.7 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.256
• Publications: 1 publications found

Genes affected

DGCR8 (HGNC:2847): (DGCR8 microprocessor complex subunit) This gene encodes a subunit of the microprocessor complex which mediates the biogenesis of microRNAs from the primary microRNA transcript. The encoded protein is a double-stranded RNA binding protein that functions as the non-catalytic subunit of the microprocessor complex. This protein is required for binding the double-stranded RNA substrate and facilitates cleavage of the RNA by the ribonuclease III protein, Drosha. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Jun 2010]

MIR1306 (HGNC:35371): (microRNA 1306) microRNAs (miRNAs) are short (20-24 nt) non-coding RNAs that are involved in post-transcriptional regulation of gene expression in multicellular organisms by affecting both the stability and translation of mRNAs. miRNAs are transcribed by RNA polymerase II as part of capped and polyadenylated primary transcripts (pri-miRNAs) that can be either protein-coding or non-coding. The primary transcript is cleaved by the Drosha ribonuclease III enzyme to produce an approximately 70-nt stem-loop precursor miRNA (pre-miRNA), which is further cleaved by the cytoplasmic Dicer ribonuclease to generate the mature miRNA and antisense miRNA star (miRNA*) products. The mature miRNA is incorporated into a RNA-induced silencing complex (RISC), which recognizes target mRNAs through imperfect base pairing with the miRNA and most commonly results in translational inhibition or destabilization of the target mRNA. The RefSeq represents the predicted microRNA stem-loop. [provided by RefSeq, Sep 2009]

MIR3618 (HGNC:38937): (microRNA 3618) microRNAs (miRNAs) are short (20-24 nt) non-coding RNAs that are involved in post-transcriptional regulation of gene expression in multicellular organisms by affecting both the stability and translation of mRNAs. miRNAs are transcribed by RNA polymerase II as part of capped and polyadenylated primary transcripts (pri-miRNAs) that can be either protein-coding or non-coding. The primary transcript is cleaved by the Drosha ribonuclease III enzyme to produce an approximately 70-nt stem-loop precursor miRNA (pre-miRNA), which is further cleaved by the cytoplasmic Dicer ribonuclease to generate the mature miRNA and antisense miRNA star (miRNA*) products. The mature miRNA is incorporated into a RNA-induced silencing complex (RISC), which recognizes target mRNAs through imperfect base pairing with the miRNA and most commonly results in translational inhibition or destabilization of the target mRNA. The RefSeq represents the predicted microRNA stem-loop. [provided by RefSeq, Sep 2009]

ACMG classification

Our verdict: Likely_benign. The variant received -6 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.07706505).
• BS2: High AC in GnomAdExome4 at 12 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_022720.7. 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
	DGCR8	NM_022720.7	MANE Select	c.68G>C	p.Arg23Pro	missense	Exon 2 of 14	NP_073557.3
	DGCR8	NM_001190326.2		c.68G>C	p.Arg23Pro	missense	Exon 2 of 13	NP_001177255.1	Q8WYQ5-3
	MIR1306	NR_031706.1		n.-27G>C		upstream_gene	N/A

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DGCR8	ENST00000351989.8	TSL:1 MANE Select	c.68G>C	p.Arg23Pro	missense	Exon 2 of 14	ENSP00000263209.3	Q8WYQ5-1
	DGCR8	ENST00000407755.2	TSL:1	c.68G>C	p.Arg23Pro	missense	Exon 2 of 13	ENSP00000384726.1	Q8WYQ5-3
	DGCR8	ENST00000495826.5	TSL:1	n.212G>C		non_coding_transcript_exon	Exon 1 of 12

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000797 AC: 2 AN: 250884 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000176

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000821 AC: 12 AN: 1461330 Hom.: 0 Cov.: 32 AF XY: 0.00000963 AC XY: 7 AN XY: 726956

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.0000224 AC: 1 AN: 44716

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26126

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86248

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53020

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000989 AC: 11 AN: 1111896

Other (OTH) AF: 0.00 AC: 0 AN: 60376

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000824 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.086
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.46
CADD	Benign	16
DANN	Benign	0.97
DEOGEN2	Benign	0.046	T
Eigen	Benign	-0.57
Eigen_PC	Benign	-0.38
FATHMM_MKL	Benign	0.71	D
LIST_S2	Benign	0.69	T
M_CAP	Benign	0.0034	T
MetaRNN	Benign	0.077	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	-0.55	N
PhyloP100		0.26
PrimateAI	Benign	0.32	T
PROVEAN	Benign	-0.45	N
REVEL	Benign	0.23
Sift	Benign	0.18	T
Sift4G	Benign	0.23	T
Polyphen		0.0	B
Vest4		0.16
MutPred		0.14		Gain of loop (P = 0.0097)
MVP		0.45
MPC		0.69
ClinPred		0.094	T
GERP RS		1.9
PromoterAI		0.0056	Neutral
RBP_binding_hub_radar		0.97
RBP_regulation_power_radar		2.1
Varity_R		0.085
gMVP		0.083
Mutation Taster		=86/14	polymorphism

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: rs768655560; hg19: chr22-20073554;