Genetic Variant RMRP:n.-10_-9insACTCTGTGAAGCT (chr9-35658026-C-CAGCTTCACAGAGT) – ACMG Classification: Pathogenic (10 pts)

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PM2PP5_Very_Strong

The NR_003051.4(RMRP):n.-8_-7insACTCTGTGAAGCT variant causes a upstream gene change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000277 in 685,526 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★).

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 34)

Exomes 𝑓: 0.000028 ( 0 hom. )

Consequence

RMRP
NR_003051.4 upstream_gene

Scores

Not classified

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3

Conservation

PhyloP100: -9.77

Variant links:

Genes affected

RMRP (HGNC:10031): (RNA component of mitochondrial RNA processing endoribonuclease) This gene encodes the RNA component of mitochondrial RNA processing endoribonuclease, which cleaves mitochondrial RNA at a priming site of mitochondrial DNA replication. This RNA also interacts with the telomerase reverse transcriptase catalytic subunit to form a distinct ribonucleoprotein complex that has RNA-dependent RNA polymerase activity and produces double-stranded RNAs that can be processed into small interfering RNA. Mutations in this gene are associated with cartilage-hair hypoplasia.[provided by RefSeq, Mar 2010]

RMRP links:

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ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 10 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 9-35658026-C-CAGCTTCACAGAGT is Pathogenic according to our data. Variant chr9-35658026-C-CAGCTTCACAGAGT is described in ClinVar as [Likely_pathogenic]. Clinvar id is 465205.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RMRP	NR_003051.4 link	n.-8_-7insACTCTGTGAAGCT		upstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RMRP	ENST00000363046.1 link	n.-10_-9insACTCTGTGAAGCT		upstream_gene_variant		6

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152122

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000634

AC:

AN:

126250

Hom.:

AF XY:

0.0000725

AC XY:

AN XY:

68980

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000850

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000455

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000841

Gnomad OTH exome

AF:

0.000257

GnomAD4 exome

AF:

0.0000281

AC:

AN:

533404

Hom.:

Cov.:

AF XY:

0.0000279

AC XY:

AN XY:

286710

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000591

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000161

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000294

Gnomad4 OTH exome

AF:

0.0000673

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152122

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74332

show subpopulations

Gnomad4 AFR

AF:

0.0000483

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000158

Hom.:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Metaphyseal chondrodysplasia, McKusick type

Pathogenic:2

Apr 10, 2023

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: RMRP n.-21_-9dup13 variant involves the duplication of 13 nucleotides in the promoter region of RMRP, which is located between the TATA box (-33 to -25) and the transcription initiation site. The variant allele was found at a frequency of 6.3e-05 in 157630 control chromosomes in gnomAD. This frequency is not significantly higher than estimated for a pathogenic variant in RMRP causing Cartilage-Hair Hypoplasia (6.3e-05 vs 0.0072), allowing no conclusion about variant significance. n.-21_-9dup13 has been reported in the literature in individuals affected with Cartilage-Hair Hypoplasia (Bonafe_2005, Turkkani_2009). These data indicate that the variant may be associated with disease. Additionally, the variant has been shown to impair chondrogenic trans-differentiation in fibroblasts of an affected patient (Steinbusch_2017). Similar type of duplications or insertios have been reported in CHH patients and shown to reduce the transcription of RMRP and were associated with lower shRNA expression (excample: Ridanpaa_2001, PMID 11207361, Hermanns_2005, PMID 16254002). Two clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 and classified the variant as pathogenic/likely pathogenic. Based on the evidence outlined above, the variant was classified as likely pathogenic. -

Sep 16, 2020

Natera, Inc.

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Anauxetic dysplasia

Pathogenic:1

Nov 03, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant occurs in the RMRP gene, which encodes an RNA molecule that does not result in a protein product. This variant is present in population databases (rs751921616, gnomAD 0.008%). This variant has been observed in individual(s) with RMRP-related conditions (PMID: 16244706; internal data). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. Other insertions and duplications immediately upstream of the coding sequence have been reported in individuals affected with cartilage-hair hypoplasia-anauxetic dysplasia (CHH-AD) spectrum disorders (PMID: 16244706, 11207361, 12107819). This variant is also known as g.22_10dupACTCTGTGAAGCT. ClinVar contains an entry for this variant (Variation ID: 465205). While functional studies for this variant have not been reported, experimental analyses using patient derived cells, as well as in vitro transfection studies, have shown that promoter insertions result in silencing of RMRP transcription and reduced expression of the gene product (PMID: 11207361, 16254002). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

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