5-176388959-C-T

Position:

• chr5-176388959-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_138820.4(HIGD2A):​c.140C>T​(p.Pro47Leu) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,461,826 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: HIGD2A NM_138820.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.05

Genes affected

HIGD2A (HGNC:28311): (HIG1 hypoxia inducible domain family member 2A) The protein encoded by this gene is a subunit of the cytochrome c oxidase complex (complex IV), which is the terminal enzyme in the mitochondrial respiratory chain. The encoded protein is an inner mitochondrial membrane protein and is a functional ortholog of the yeast respiratory supercomplex factor 1 (Rcf1). In mouse, the orthologous protein enhances cell survival under conditions of hypoxia. [provided by RefSeq, Sep 2016]

ARL10 (HGNC:22042): (ADP ribosylation factor like GTPase 10) Predicted to enable GTP binding activity and GTPase activity. [provided by Alliance of Genome Resources, Apr 2022]

NOP16 (HGNC:26934): (NOP16 nucleolar protein) This gene encodes a protein that is localized to the nucleolus. Expression of this gene is induced by estrogens and Myc protein and is a marker of poor patient survival in breast cancer. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2015]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.99

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HIGD2A	NM_138820.4	c.140C>T	p.Pro47Leu	missense_variant	1/2	ENST00000274787.3
ARL10	XM_011534529.4	c.561+19977C>T		intron_variant
ARL10	XM_011534530.4	c.561+19977C>T		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HIGD2A	ENST00000274787.3	c.140C>T	p.Pro47Leu	missense_variant	1/2	1	NM_138820.4	P1
ARL10	ENST00000514533.1	c.134-12782C>T		intron_variant		3
NOP16	ENST00000618911.4			upstream_gene_variant		1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461826 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727206

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 06, 2022

The c.140C>T (p.P47L) alteration is located in exon 1 (coding exon 1) of the HIGD2A gene. This alteration results from a C to T substitution at nucleotide position 140, causing the proline (P) at amino acid position 47 to be replaced by a leucine (L). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.63
BayesDel_addAF	Pathogenic	0.46	D
BayesDel_noAF	Pathogenic	0.43
CADD	Pathogenic	31
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.51	D
Eigen	Pathogenic	0.88
Eigen_PC	Pathogenic	0.81
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.88	D
M_CAP	Benign	0.081	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Uncertain	0.27	D
MutationAssessor	Pathogenic	3.3	M
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.64	T
PROVEAN	Pathogenic	-9.4	D
REVEL	Uncertain	0.55
Sift	Uncertain	0.0070	D
Sift4G	Uncertain	0.0040	D
Polyphen		1.0	D
Vest4		0.97
MutPred		0.92		Gain of MoRF binding (P = 0.0598);
MVP		0.54
MPC		1.9
ClinPred		1.0	D
GERP RS		5.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.71
gMVP		0.95

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

Publications

LitVar

Other links and lift over

dbSNP: rs752348331; hg19: chr5-175815960;