8-102236850-G-C

Variant names:

• chr8-102236850-G-C
• rs28999675
• NM_015713.5:c.48+1977C>G

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BS1 BS2

The NM_015713.5(RRM2B):​c.48+1977C>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0106 in 152,250 control chromosomes in the GnomAD database, including 19 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 0.011 (19 hom., cov: 32)
• Consequence: RRM2B NM_015713.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.0810
• Publications: 3 publications found

Genes affected

RRM2B (HGNC:17296): (ribonucleotide reductase regulatory TP53 inducible subunit M2B) This gene encodes the small subunit of a p53-inducible ribonucleotide reductase. This heterotetrameric enzyme catalyzes the conversion of ribonucleoside diphosphates to deoxyribonucleoside diphosphates. The product of this reaction is necessary for DNA synthesis. Mutations in this gene have been associated with autosomal recessive mitochondrial DNA depletion syndrome, autosomal dominant progressive external ophthalmoplegia-5, and mitochondrial neurogastrointestinal encephalopathy. Alternatively spliced transcript variants have been described.[provided by RefSeq, Feb 2010]

RRM2B Gene-Disease associations (from GenCC):

• mitochondrial DNA depletion syndrome 8a

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Orphanet
• progressive external ophthalmoplegia with mitochondrial DNA deletions, autosomal dominant 5

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• adult-onset chronic progressive external ophthalmoplegia with mitochondrial myopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• autosomal dominant progressive external ophthalmoplegia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Kearns-Sayre syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• mitochondrial neurogastrointestinal encephalomyopathy

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

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

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.8).
• BS1: Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.0106 (1616/152250) while in subpopulation AFR AF = 0.0354 (1471/41546). AF 95% confidence interval is 0.0339. There are 19 homozygotes in GnomAd4. There are 794 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.
• BS2: High Homozygotes in GnomAd4 at 19 AR,AD gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_015713.5. 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
	RRM2B	NM_015713.5	MANE Select	c.48+1977C>G		intron	N/A	NP_056528.2
	RRM2B	NM_001172477.1		c.264+1709C>G		intron	N/A	NP_001165948.1
	RRM2B	NM_001172478.2		c.48+1977C>G		intron	N/A	NP_001165949.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RRM2B	ENST00000251810.8	TSL:1 MANE Select	c.48+1977C>G		intron	N/A	ENSP00000251810.3
	RRM2B	ENST00000395912.6	TSL:1	c.48+1977C>G		intron	N/A	ENSP00000379248.2
	RRM2B	ENST00000519317.5	TSL:1	c.48+1977C>G		intron	N/A	ENSP00000430641.1

Frequencies

GnomAD3 genomes AF: 0.0106 AC: 1613 AN: 152132 Hom.: 19 Cov.: 32

Gnomad AFR AF: 0.0354

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00714

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.000176

Gnomad OTH AF: 0.0110

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

GnomAD4 genome AF: 0.0106 AC: 1616 AN: 152250 Hom.: 19 Cov.: 32 AF XY: 0.0107 AC XY: 794 AN XY: 74420

African (AFR) AF: 0.0354 AC: 1471 AN: 41546

American (AMR) AF: 0.00713 AC: 109 AN: 15286

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5184

South Asian (SAS) AF: 0.00 AC: 0 AN: 4814

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10600

Middle Eastern (MID) AF: 0.00340 AC: 1 AN: 294

European-Non Finnish (NFE) AF: 0.000176 AC: 12 AN: 68032

Other (OTH) AF: 0.0109 AC: 23 AN: 2112

Alfa AF: 0.00728 Hom.: 1

Bravo AF: 0.0120

Asia WGS AF: 0.00144 AC: 5 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.80
CADD	Benign	5.6
DANN	Benign	0.75
PhyloP100		0.081
Mutation Taster		=100/0	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: rs28999675; hg19: chr8-103249078;