chr4-122947396-C-T

Variant names:

• chr4-122947396-C-T
• rs143957561
• NM_145207.3:c.1622C>T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_145207.3(AFG2A):​c.1622C>T​(p.Pro541Leu) variant causes a missense change. The variant allele was found at a frequency of 0.00000342 in 1,461,858 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: AFG2A NM_145207.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 5.22

Genes affected

AFG2A (HGNC:18119): (AFG2 AAA ATPase homolog A) This gene encodes a member of the ATPase associated with diverse activities family, whose members are defined by a highly conserved ATPase domain. Members of this family participate in diverse cellular processes that include membrane fusion, DNA replication, microtubule severing, and protein degradation. The protein encoded by this gene has a putative mitochondrial targeting sequence and has been proposed to function in maintenance of mitochondrial function and integrity during mouse spermatogenesis. Allelic variants in this gene have been associated with epilepsy, hearing loss, and cognitive disability syndrome. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.36289394).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AFG2A	NM_145207.3	c.1622C>T	p.Pro541Leu	missense_variant	Exon 9 of 16	ENST00000274008.5	NP_660208.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SPATA5	ENST00000274008.5	c.1622C>T	p.Pro541Leu	missense_variant	Exon 9 of 16	1	NM_145207.3	ENSP00000274008.3
SPATA5	ENST00000422835.2	n.1664C>T		non_coding_transcript_exon_variant	Exon 9 of 15	1
SPATA5	ENST00000675612.1	c.1619C>T	p.Pro540Leu	missense_variant	Exon 9 of 17			ENSP00000502453.1
SPATA5	ENST00000674886.1	n.1684C>T		non_coding_transcript_exon_variant	Exon 9 of 11

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000199 AC: 5 AN: 251432 Hom.: 0 AF XY: 0.0000221 AC XY: 3 AN XY: 135884

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000145

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS 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: 0.00000342 AC: 5 AN: 1461858 Hom.: 0 Cov.: 31 AF XY: 0.00000413 AC XY: 3 AN XY: 727234

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000112

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Nov 27, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1622C>T (p.P541L) alteration is located in exon 9 (coding exon 9) of the AFG2A gene. This alteration results from a C to T substitution at nucleotide position 1622, causing the proline (P) at amino acid position 541 to be replaced by a leucine (L). Based on data from gnomAD, the T allele has an overall frequency of 0.002% (5/251432) total alleles studied. The highest observed frequency was 0.015% (5/34590) of Latino alleles. This amino acid position is highly conserved in available vertebrate species. The in silico prediction for this alteration is inconclusive. Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Microcephaly-intellectual disability-sensorineural hearing loss-epilepsy-abnormal muscle tone syndrome Uncertain:1

Oct 04, 2018

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant has not been reported in the literature in individuals with SPATA5-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. This variant is present in population databases (rs143957561, ExAC 0.009%). This sequence change replaces proline with leucine at codon 541 of the SPATA5 protein (p.Pro541Leu). The proline residue is highly conserved and there is a moderate physicochemical difference between proline and leucine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.32
BayesDel_addAF	Benign	-0.039	T
BayesDel_noAF	Uncertain	-0.070
CADD	Uncertain	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.25	T
Eigen	Uncertain	0.35
Eigen_PC	Uncertain	0.29
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Uncertain	0.97	D
M_CAP	Uncertain	0.20	D
MetaRNN	Benign	0.36	T
MetaSVM	Pathogenic	1.0	D
PrimateAI	Uncertain	0.59	T
PROVEAN	Pathogenic	-7.3	D
REVEL	Uncertain	0.59
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.0020	D
Polyphen		0.55	P
Vest4		0.32
MutPred		0.66		Gain of MoRF binding (P = 0.0807);
MVP		0.92
MPC		0.47
ClinPred		0.97	D
GERP RS		4.7
RBP_binding_hub_radar		1.0
RBP_regulation_power_radar		2.1
Varity_R		0.74
gMVP		0.69

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: rs143957561; hg19: chr4-123868551;