15-64963685-T-G

Position:

• chr15-64963685-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_016630.7(SPG21):​c.862A>C​(p.Met288Leu) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,856 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/20 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: SPG21 NM_016630.7 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 5.79

Genes affected

SPG21 (HGNC:20373): (SPG21 abhydrolase domain containing, maspardin) The protein encoded by this gene binds to the hydrophobic C-terminal amino acids of CD4 which are involved in repression of T cell activation. The interaction with CD4 is mediated by the noncatalytic alpha/beta hydrolase fold domain of this protein. It is thus proposed that this gene product modulates the stimulatory activity of CD4. Mutations in this gene are associated with autosomal recessive spastic paraplegia 21 (SPG21), also known as mast syndrome. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2014]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.15224066).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SPG21	NM_016630.7	c.862A>C	p.Met288Leu	missense_variant	9/9	ENST00000204566.7	NP_057714.1
SPG21	NM_001127889.5	c.862A>C	p.Met288Leu	missense_variant	9/9		NP_001121361.1
SPG21	NM_001127890.5	c.781A>C	p.Met261Leu	missense_variant	8/8		NP_001121362.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SPG21	ENST00000204566.7	c.862A>C	p.Met288Leu	missense_variant	9/9	1	NM_016630.7	ENSP00000204566	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461856 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727232

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

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

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.0053	T
BayesDel_noAF	Benign	-0.25
CADD	Benign	17
DANN	Benign	0.95
DEOGEN2	Benign	0.14	T;.;T;.
Eigen	Benign	-0.27
Eigen_PC	Benign	-0.074
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.93	.;D;D;D
M_CAP	Benign	0.0038	T
MetaRNN	Benign	0.15	T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.81	L;.;L;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.53	T
PROVEAN	Benign	-0.10	N;N;N;N
REVEL	Uncertain	0.33
Sift	Benign	0.36	T;T;T;T
Sift4G	Benign	1.0	T;T;T;T
Polyphen		0.0	B;.;B;B
Vest4		0.44
MutPred		0.28		Gain of glycosylation at S287 (P = 0.0593);.;Gain of glycosylation at S287 (P = 0.0593);.;
MVP		0.25
MPC		0.30
ClinPred		0.39	T
GERP RS		4.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.12
gMVP		0.63

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: rs371753104; hg19: chr15-65256026;