rs727502777

Variant names:

• chr9-35658023-C-CCTCAGCTTCACAGAGTA
• rs727502777
• ENST00000363046.2:n.-5_-4insTACTCTGTGAAGCTGAG

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PP5_Moderate

The ENST00000363046.2(RMRP):​n.-5_-4insTACTCTGTGAAGCTGAG variant causes a upstream gene change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000373 in 535,768 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: not found (cov: 34)
  • Exomes 𝑓: 0.0000037 (0 hom.)
• Consequence: RMRP ENST00000363046.2 upstream_gene
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2
• 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: Uncertain_significance. The variant received 2 ACMG points.

• PP5: Variant 9-35658023-C-CCTCAGCTTCACAGAGTA is Pathogenic according to our data. Variant chr9-35658023-C-CCTCAGCTTCACAGAGTA is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 556306.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RMRP	NR_003051.4	n.-5_-4insTACTCTGTGAAGCTGAG		upstream_gene_variant		ENST00000363046.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RMRP	ENST00000363046.2	n.-5_-4insTACTCTGTGAAGCTGAG		upstream_gene_variant		6	NR_003051.4

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD2 exomes AF: 0.0000157 AC: 2 AN: 127292 AF XY: 0.0000144

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 FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000373 AC: 2 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: 0.00 AC: 0 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: 0.0000321 AC: 2 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: 0.00 AC: 0 AN: 307216

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

GnomAD4 genome Cov.: 34

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Metaphyseal chondrodysplasia, McKusick type Pathogenic:1

Jan 31, 2018

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. -

Anauxetic dysplasia Pathogenic:1

Feb 03, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely 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 (rs727502777, gnomAD 0.009%). While this particular variant has not been reported in the literature, it is located in the promoter region between the TATA box and the transcription initiation site, and 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: 556306). 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). In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

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: rs727502777; hg19: chr9-35658020;