chr8-102224909-G-C

Variant names:

• chr8-102224909-G-C
• rs515726189
• NM_015713.5:c.431C>G

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PM5

The NM_015713.5(RRM2B):​c.431C>G​(p.Thr144Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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. T144I) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: RRM2B NM_015713.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 9.94
• Publications: 4 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: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr8-102224909-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 132115.

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.431C>G	p.Thr144Ser	missense	Exon 4 of 9	NP_056528.2
	RRM2B	NM_001172477.1		c.647C>G	p.Thr216Ser	missense	Exon 4 of 9	NP_001165948.1
	RRM2B	NM_001172478.2		c.275C>G	p.Thr92Ser	missense	Exon 3 of 8	NP_001165949.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RRM2B	ENST00000251810.8	TSL:1 MANE Select	c.431C>G	p.Thr144Ser	missense	Exon 4 of 9	ENSP00000251810.3
	RRM2B	ENST00000395912.6	TSL:1	c.275C>G	p.Thr92Ser	missense	Exon 3 of 8	ENSP00000379248.2
	RRM2B	ENST00000519317.5	TSL:1	c.49-10751C>G		intron	N/A	ENSP00000430641.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.16
BayesDel_addAF	Pathogenic	0.35	D
BayesDel_noAF	Pathogenic	0.26
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.91	D
Eigen	Uncertain	0.40
Eigen_PC	Uncertain	0.56
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.96	D
M_CAP	Uncertain	0.094	D
MetaRNN	Uncertain	0.74	D
MetaSVM	Pathogenic	0.80	D
MutationAssessor	Uncertain	2.3	M
PhyloP100		9.9
PrimateAI	Uncertain	0.65	T
PROVEAN	Uncertain	-3.6	D
REVEL	Uncertain	0.61
Sift	Benign	0.038	D
Sift4G	Benign	0.12	T
Polyphen		0.16	B
Vest4		0.72
MutPred		0.67		Gain of disorder (P = 0.0885)
MVP		0.96
MPC		0.36
ClinPred		0.96	D
GERP RS		5.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.7
Varity_R		0.76
gMVP		0.88
Mutation Taster		=24/76	disease causing

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: rs515726189; hg19: chr8-103237137;