NM_181705.4:c.193_195dupTTA

Variant names:

• chr5-131187053-A-AATT
• rs869025603
• NM_181705.4:c.193_195dupTTA

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PM4_Supporting PP5

The NM_181705.4(LYRM7):​c.193_195dupTTA​(p.Leu66dup) variant causes a conservative inframe insertion change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: LYRM7 NM_181705.4 conservative_inframe_insertion
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 4.12
• Publications: 1 publications found

Genes affected

LYRM7 (HGNC:28072): (LYR motif containing 7) Inner mitochondrial membrane complex III (CIII) is the main enzyme complex in the mitochondrial respiratory chain, and Rieske Fe-S protein (UQCRFS1) is the last catalytic subunit added to the complex. The protein encoded by this gene is a nuclear-encoded mitochondrial matrix protein that stabilizes UQCRFS1 and chaperones it to the CIII complex. Defects in this gene are a cause of mitochondrial complex III deficiency, nuclear type 8. Three transcript variants encoding two different isoforms have been found for this gene. [provided by RefSeq, Jun 2014]

HINT1 (HGNC:4912): (histidine triad nucleotide binding protein 1) This gene encodes a protein that hydrolyzes purine nucleotide phosphoramidates substrates, including AMP-morpholidate, AMP-N-alanine methyl ester, AMP-alpha-acetyl lysine methyl ester, and AMP-NH2. The encoded protein interacts with these substrates via a histidine triad motif. This gene is considered a tumor suppressor gene. In addition, mutations in this gene can cause autosomal recessive neuromyotonia and axonal neuropathy. There are several related pseudogenes on chromosome 7. Several transcript variants have been observed. [provided by RefSeq, Dec 2015]

HINT1 Gene-Disease associations (from GenCC):

• Charcot-Marie-Tooth disease

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• Gamstorp-Wohlfart syndrome

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_181705.4. Strenght limited to Supporting due to length of the change: 1aa.
• PP5: Variant 5-131187053-A-AATT is Pathogenic according to our data. Variant chr5-131187053-A-AATT is described in ClinVar as Pathogenic. ClinVar VariationId is 223135.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_181705.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LYRM7	NM_181705.4	MANE Select	c.193_195dupTTA	p.Leu66dup	conservative_inframe_insertion	Exon 4 of 5	NP_859056.2	Q5U5X0
	LYRM7	NM_001293735.2		c.162+4759_162+4761dupTTA		intron	N/A	NP_001280664.1	D6RBV5
	LYRM7	NR_121658.2		n.168+6891_168+6893dupTTA		intron	N/A

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LYRM7	ENST00000379380.9	TSL:1 MANE Select	c.193_195dupTTA	p.Leu66dup	conservative_inframe_insertion	Exon 4 of 5	ENSP00000368688.4	Q5U5X0
	LYRM7	ENST00000855899.1		c.190_192dupTTA	p.Leu65dup	conservative_inframe_insertion	Exon 4 of 5	ENSP00000525958.1
	LYRM7	ENST00000931593.1		c.187_189dupTTA	p.Leu64dup	conservative_inframe_insertion	Exon 4 of 5	ENSP00000601652.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 26

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	Mitochondrial complex III deficiency nuclear type 8 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		4.1
Mutation Taster		=67/33	disease causing (ClinVar)

Splicing

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

Other links and lift over

dbSNP: rs869025603; hg19: chr5-130522746;