rs1554651453

Variant names:

• chr9-35658023-C-CCTCAGCTTCACAGAGTAG
• rs1554651453
• ENST00000363046.2:n.-5_-4insCTACTCTGTGAAGCTGAG

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PP5_Very_Strong

The ENST00000363046.2(RMRP):​n.-5_-4insCTACTCTGTGAAGCTGAG variant causes a upstream gene change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000582 in 687,834 control chromosomes in the GnomAD database, with no homozygous occurrence. It is difficult to determine the true allele frequency of this variant because it is of type INS_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 34)
  • Exomes 𝑓: 0.0000056 (0 hom.)
• Consequence: RMRP ENST00000363046.2 upstream_gene
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: -12.7
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• cartilage-hair hypoplasia

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, Myriad Women’s Health, G2P

ACMG classification

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

• PP5: Variant 9-35658023-C-CCTCAGCTTCACAGAGTAG is Pathogenic according to our data. Variant chr9-35658023-C-CCTCAGCTTCACAGAGTAG is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 551924.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	n.-5_-4insCTACTCTGTGAAGCTGAG		upstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RMRP	ENST00000363046.2	n.-5_-4insCTACTCTGTGAAGCTGAG		upstream_gene_variant		6

Frequencies

GnomAD3 genomes AF: 0.00000658 AC: 1 AN: 152066 Hom.: 0 Cov.: 34

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

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: 0.00

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.00000786 AC: 1 AN: 127292 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000421

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000560 AC: 3 AN: 535768 Hom.: 0 Cov.: 0 AF XY: 0.00000347 AC XY: 1 AN XY: 288226

African (AFR) AF: 0.00 AC: 0 AN: 15458

American (AMR) AF: 0.0000293 AC: 1 AN: 34146

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19692

East Asian (EAS) AF: 0.00 AC: 0 AN: 31754

South Asian (SAS) AF: 0.0000161 AC: 1 AN: 62238

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 33070

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 2398

European-Non Finnish (NFE) AF: 0.00000326 AC: 1 AN: 307216

Other (OTH) AF: 0.00 AC: 0 AN: 29796

GnomAD4 genome AF: 0.00000658 AC: 1 AN: 152066 Hom.: 0 Cov.: 34 AF XY: 0.00 AC XY: 0 AN XY: 74310

African (AFR) AF: 0.00 AC: 0 AN: 41384

American (AMR) AF: 0.0000655 AC: 1 AN: 15272

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3468

East Asian (EAS) AF: 0.00 AC: 0 AN: 5192

South Asian (SAS) AF: 0.00 AC: 0 AN: 4828

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10616

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67986

Other (OTH) AF: 0.00 AC: 0 AN: 2092

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Metaphyseal chondrodysplasia, McKusick type Pathogenic:2

May 17, 2017

Counsyl

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

This submission and the accompanying classification are no longer maintained by the submitter. For more information on current observations and classification, please contact variantquestions@myriad.com. -

Sep 10, 2024

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.-23_-6dup18 is located in the untranscribed region upstream of the RMRP gene region and involves the duplication of 18 nucleotides in the promoter region of RMRP, which is located between the TATA box (-33 to -25) and the transcription initiation site. Other insertions or duplications in the promoter region of RMRP have been classified as pathogenic (internally and in ClinVar). The variant allele was found at a frequency of 1.3e-05 in 158634 control chromosomes (gnomAD). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. To our knowledge, no occurrence of n.-23_-6dup18 in individuals affected with Cartilage-Hair Hypoplasia and no experimental evidence demonstrating its impact on RNA function have been reported. However, many other insertions or duplications in the promoter region of RMRP have been reported in affected individuals in the literature (e.g. PMIDs: 21956908, 21396580) and have been demonstrated through functional studies to lead to reduced RMRP transcription (e.g. PMIDs: 11207361, 16254002, 17937437). ClinVar contains an entry for this variant (Variation ID: 551924). Based on the evidence outlined above, the variant was classified as likely pathogenic. -

Anauxetic dysplasia Pathogenic:1

Mar 10, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant has been observed in individual(s) with cartilage-hair hypoplasia-anauxetic dysplasia spectrum disorders (Invitae). 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). ClinVar contains an entry for this variant (Variation ID: 551924). 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. This variant is present in population databases (no rsID available, gnomAD 0.008%). This variant occurs in the RMRP gene, which encodes an RNA molecule that does not result in a protein product. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		-13

Splicing

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

Other links and lift over

dbSNP: rs1554651453; hg19: chr9-35658020;