21-25601452-A-C

Variant names:

• chr21-25601452-A-C
• rs761373912
• NM_017446.4:c.436T>G

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM2 PP2 PP3_Moderate

The NM_017446.4(MRPL39):​c.436T>G​(p.Cys146Gly) variant causes a missense change. The variant allele was found at a frequency of 0.000000696 in 1,437,164 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. C146S) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
• Consequence: MRPL39 NM_017446.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 5.92
• Publications: 0 publications found

Genes affected

MRPL39 (HGNC:14027): (mitochondrial ribosomal protein L39) Mammalian mitochondrial ribosomal proteins are encoded by nuclear genes and help in protein synthesis within the mitochondrion. Mitochondrial ribosomes (mitoribosomes) consist of a small 28S subunit and a large 39S subunit. They have an estimated 75% protein to rRNA composition compared to prokaryotic ribosomes, where this ratio is reversed. Another difference between mammalian mitoribosomes and prokaryotic ribosomes is that the latter contain a 5S rRNA. Among different species, the proteins comprising the mitoribosome differ greatly in sequence, and sometimes in biochemical properties, which prevents easy recognition by sequence homology. This gene encodes a 39S subunit protein. Two transcript variants encoding distinct isoforms have been described. A pseudogene corresponding to this gene is found on chromosome 5q. [provided by RefSeq, Jul 2008]

MRPL39 Gene-Disease associations (from GenCC):

• mitochondrial disease

  Inheritance: AR Classification: MODERATE Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 1 curated pathogenic missense variants (we use a threshold of 10). The gene has 0 curated benign missense variants. Gene score misZ: -0.37309 (below the threshold of 3.09). Trascript score misZ: -0.3663 (below the threshold of 3.09). GenCC associations: The gene is linked to mitochondrial disease.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.912

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_017446.4. 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
	MRPL39	NM_017446.4	MANE Select	c.436T>G	p.Cys146Gly	missense	Exon 4 of 10	NP_059142.3
	MRPL39	NM_080794.4		c.436T>G	p.Cys146Gly	missense	Exon 4 of 11	NP_542984.3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MRPL39	ENST00000352957.9	TSL:1 MANE Select	c.436T>G	p.Cys146Gly	missense	Exon 4 of 10	ENSP00000284967.7	Q9NYK5-1
	MRPL39	ENST00000307301.11	TSL:5	c.436T>G	p.Cys146Gly	missense	Exon 4 of 11	ENSP00000305682.7	Q9NYK5-2
	MRPL39	ENST00000925346.1		c.454T>G	p.Cys152Gly	missense	Exon 4 of 10	ENSP00000595405.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000420 AC: 1 AN: 238364 AF XY: 0.00

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: 0.00000914

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.96e-7 AC: 1 AN: 1437164 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 714208

African (AFR) AF: 0.00 AC: 0 AN: 33012

American (AMR) AF: 0.00 AC: 0 AN: 43162

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25574

East Asian (EAS) AF: 0.00 AC: 0 AN: 39080

South Asian (SAS) AF: 0.00 AC: 0 AN: 80236

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 51956

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5674

European-Non Finnish (NFE) AF: 9.10e-7 AC: 1 AN: 1099370

Other (OTH) AF: 0.00 AC: 0 AN: 59100

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000434 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.44
BayesDel_addAF	Pathogenic	0.21	D
BayesDel_noAF	Uncertain	0.060
CADD	Pathogenic	27
DANN	Uncertain	0.98
DEOGEN2	Benign	0.31	T
Eigen	Uncertain	0.54
Eigen_PC	Uncertain	0.55
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.91	D
M_CAP	Benign	0.040	D
MetaRNN	Pathogenic	0.91	D
MetaSVM	Benign	-0.60	T
MutationAssessor	Uncertain	2.4	M
PhyloP100		5.9
PrimateAI	Uncertain	0.68	T
PROVEAN	Pathogenic	-11	D
REVEL	Uncertain	0.39
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.91	P
Vest4		0.84
MutPred		0.80		Gain of MoRF binding (P = 0.0923)
MVP		0.71
MPC		0.27
ClinPred		1.0	D
GERP RS		4.9
Varity_R		0.96
gMVP		0.76
Mutation Taster		=12/88	disease causing

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

Other links and lift over

dbSNP: rs761373912; hg19: chr21-26973764;