22-43963368-C-T

Variant summary

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

The NM_015380.5(SAMM50):c.104C>T(p.Ala35Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,459,158 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: SAMM50 NM_015380.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.90

Genes affected

SAMM50 (HGNC:24276): (SAMM50 sorting and assembly machinery component) This gene encodes a component of the Sorting and Assembly Machinery (SAM) of the mitochondrial outer membrane. The Sam complex functions in the assembly of beta-barrel proteins into the outer mitochondrial membrane.[provided by RefSeq, Jun 2011]

PNPLA3 (HGNC:18590): (patatin like phospholipase domain containing 3) The protein encoded by this gene is a triacylglycerol lipase that mediates triacylglycerol hydrolysis in adipocytes. The encoded protein, which appears to be membrane bound, may be involved in the balance of energy usage/storage in adipocytes. [provided by RefSeq, Jul 2008]

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=0.09043494).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SAMM50	NM_015380.5	c.104C>T	p.Ala35Val	missense_variant	2/15	ENST00000350028.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SAMM50	ENST00000350028.5	c.104C>T	p.Ala35Val	missense_variant	2/15	1	NM_015380.5	P1
PNPLA3	ENST00000406117.6	c.*932C>T		3_prime_UTR_variant, NMD_transcript_variant	9/10	2
SAMM50	ENST00000493161.1	n.314+142C>T		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1459158 Hom.: 0 Cov.: 29 AF XY: 0.00000138 AC XY: 1 AN XY: 725970

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000117

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

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

Jan 27, 2022

The c.104C>T (p.A35V) alteration is located in exon 2 (coding exon 2) of the SAMM50 gene. This alteration results from a C to T substitution at nucleotide position 104, causing the alanine (A) at amino acid position 35 to be replaced by a valine (V). 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	Benign	0.088
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.49
Cadd	Benign	20
Dann	Uncertain	0.99
DEOGEN2	Benign	0.040	T
Eigen	Benign	-0.33
Eigen_PC	Benign	-0.22
FATHMM_MKL	Benign	0.17	N
LIST_S2	Uncertain	0.87	D
M_CAP	Benign	0.0053	T
MetaRNN	Benign	0.090	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.4	L
MutationTaster	Benign	1.0	N;N
PrimateAI	Uncertain	0.53	T
PROVEAN	Benign	-1.1	N
REVEL	Benign	0.095
Sift	Benign	0.11	T
Sift4G	Benign	0.16	T
Polyphen		0.0020	B
Vest4		0.43
MutPred		0.32		Gain of methylation at K36 (P = 0.0424);
MVP		0.54
MPC		0.27
ClinPred		0.27	T
GERP RS		3.4
Varity_R		0.050
gMVP		0.13

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr22-44359248;