8-42870022-A-G

Variant names:

• chr8-42870022-A-G
• rs1183403793
• NM_030954.4:c.304T>C

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM2 PP3_Strong PP5

The NM_030954.4(RNF170):​c.304T>C​(p.Cys102Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,334 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: RNF170 NM_030954.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:3 U:1
• Conservation: PhyloP100: 8.04

Genes affected

RNF170 (HGNC:25358): (ring finger protein 170) This gene encodes a RING domain-containing protein that resides in the endoplasmic reticulum (ER) membrane. This protein functions as an E3 ubiquitin ligase and mediates ubiquitination and processing of inositol 1,4,5-trisphosphate (IP3) receptors via the ER-associated protein degradation pathway. It is recruited to the activated IP3 receptors by the ERLIN1/ERLIN2 complex to which it is constitutively bound. Mutations in this gene are associated with autosomal dominant sensory ataxia. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Jun 2012]

ACMG classification

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.964
• PP5: Variant 8-42870022-A-G is Pathogenic according to our data. Variant chr8-42870022-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 638435.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Likely_pathogenic=1}. Variant chr8-42870022-A-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RNF170	NM_030954.4	c.304T>C	p.Cys102Arg	missense_variant	Exon 4 of 7	ENST00000527424.6	NP_112216.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RNF170	ENST00000527424.6	c.304T>C	p.Cys102Arg	missense_variant	Exon 4 of 7	1	NM_030954.4	ENSP00000434797.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251336 Hom.: 0 AF XY: 0.00000736 AC XY: 1 AN XY: 135836

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 SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461334 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 727022

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.00e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:3 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Spastic paraplegia 85, autosomal recessive Pathogenic:2

Likely pathogenic, criteria provided, single submitter	clinical testing	3billion, Medical Genetics	Mar 22, 2022	Same or different nucleotide change resulting in same amino acid change has been previously reported to be associated with RNF170 related disorder (PMID:31636353). The variant has been reported to co-segregate with the disease in at least 3 similarly affected relatives/individuals in the same family or similarly affected unrelated family (PMID: 31636353). In silico tool predictions suggest damaging effect of the variant on gene or gene product (REVEL: 0.959>=0.6, 3CNET: 0.975>=0.75). The variant is observed at an extremely low frequency in the gnomAD v2.1.1 dataset (total allele frequency: 0.000004). Therefore, this variant is classified as likely pathogenic according to the recommendation of ACMG/AMP guideline. -
Pathogenic, no assertion criteria provided	literature only	OMIM	Jan 05, 2022	- -

Spastic paraplegia Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

Yale Center for Mendelian Genomics, Yale University

Oct 21, 2019

- -

Autosomal dominant sensory ataxia 1 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genomic Research Center, Shahid Beheshti University of Medical Sciences

Apr 27, 2019

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.51	D
BayesDel_noAF	Pathogenic	0.60
CADD	Pathogenic	30
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.79	.;D;D;.;.;.
Eigen	Pathogenic	0.97
Eigen_PC	Pathogenic	0.85
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Pathogenic	0.99	D;D;.;D;D;D
M_CAP	Pathogenic	0.76	D
MetaRNN	Pathogenic	0.96	D;D;D;D;D;D
MetaSVM	Pathogenic	0.93	D
MutationAssessor	Pathogenic	4.1	H;H;H;.;H;.
PrimateAI	Uncertain	0.78	T
PROVEAN	Pathogenic	-12	D;D;D;D;.;D
REVEL	Pathogenic	0.96
Sift	Pathogenic	0.0	D;D;D;D;.;D
Sift4G	Pathogenic	0.0	D;D;D;D;D;.
Polyphen		1.0	D;D;D;.;.;.
Vest4		0.98
MutPred		0.78		Gain of disorder (P = 0.0417);Gain of disorder (P = 0.0417);Gain of disorder (P = 0.0417);.;Gain of disorder (P = 0.0417);Gain of disorder (P = 0.0417);
MVP		0.91
MPC		1.5
ClinPred		1.0	D
GERP RS		5.6
Varity_R		0.99
gMVP		0.98

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

Publications

LitVar

Other links and lift over

dbSNP: rs1183403793; hg19: chr8-42725165;