4-44695724-G-A

Variant names:

• chr4-44695724-G-A
• rs879255631
• NM_021927.3:c.1825G>A

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PM2 PM5 PP3_Strong

The NM_021927.3(GUF1):​c.1825G>A​(p.Ala609Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000686 in 1,458,448 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. A609S) has been classified as Pathogenic.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: GUF1 NM_021927.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 9.59
• Publications: 0 publications found

Genes affected

GUF1 (HGNC:25799): (GTP binding elongation factor GUF1) This gene encodes a GTPase that triggers back-translocation of the elongating ribosome during mitochondrial protein synthesis. The protein contains a highly conserved C-terminal domain not found in other GTPases that facilitates tRNA binding. The encoded protein is thought to prevent misincorporation of amino acids in stressful, suboptimal conditions. An allelic variant in this gene has been associated with early infantile epileptic encephalopathy-40. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2016]

GNPDA2 (HGNC:21526): (glucosamine-6-phosphate deaminase 2) The protein encoded by this gene is an allosteric enzyme that catalyzes the reversible reaction converting D-glucosamine-6-phosphate into D-fructose-6-phosphate and ammonium. Variations of this gene have been reported to be associated with influencing body mass index and susceptibility to obesity. A pseudogene of this gene is located on chromosome 9. Alternative splicing results in multiple transcript variants that encode different protein isoforms. [provided by RefSeq, Aug 2012]

ACMG classification

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

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr4-44695724-G-T is described in ClinVar as Pathogenic. ClinVar VariationId is 253096.Status of the report is no_assertion_criteria_provided, 0 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.981

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_021927.3. 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
	GUF1	NM_021927.3	MANE Select	c.1825G>A	p.Ala609Thr	missense	Exon 15 of 17	NP_068746.2	Q8N442
	GUF1	NM_001345867.2		c.853G>A	p.Ala285Thr	missense	Exon 15 of 17	NP_001332796.1
	GUF1	NM_001345869.2		c.853G>A	p.Ala285Thr	missense	Exon 14 of 16	NP_001332798.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GUF1	ENST00000281543.6	TSL:1 MANE Select	c.1825G>A	p.Ala609Thr	missense	Exon 15 of 17	ENSP00000281543.5	Q8N442
	GUF1	ENST00000953400.1		c.1843G>A	p.Ala615Thr	missense	Exon 15 of 17	ENSP00000623459.1
	GUF1	ENST00000953399.1		c.1804G>A	p.Ala602Thr	missense	Exon 15 of 17	ENSP00000623458.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.86e-7 AC: 1 AN: 1458448 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 725380

African (AFR) AF: 0.00 AC: 0 AN: 33276

American (AMR) AF: 0.00 AC: 0 AN: 43974

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25996

East Asian (EAS) AF: 0.00 AC: 0 AN: 39524

South Asian (SAS) AF: 0.00 AC: 0 AN: 85288

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53374

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5738

European-Non Finnish (NFE) AF: 9.00e-7 AC: 1 AN: 1111030

Other (OTH) AF: 0.00 AC: 0 AN: 60248

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.27
BayesDel_addAF	Pathogenic	0.44	D
BayesDel_noAF	Pathogenic	0.39
CADD	Pathogenic	30
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.60	D
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	1.0
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	1.0	D
M_CAP	Uncertain	0.15	D
MetaRNN	Pathogenic	0.98	D
MetaSVM	Uncertain	0.75	D
MutationAssessor	Pathogenic	4.1	H
PhyloP100		9.6
PrimateAI	Uncertain	0.70	T
PROVEAN	Uncertain	-3.8	D
REVEL	Pathogenic	0.92
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.97
MutPred		0.88		Gain of methylation at K614 (P = 0.0822)
MVP		0.89
MPC		0.37
ClinPred		1.0	D
GERP RS		5.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.83
gMVP		0.82
Mutation Taster		=44/56	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: rs879255631; hg19: chr4-44697741;