19-39370044-C-A

Variant names:

• chr19-39370044-C-A
• rs763237352
• NM_001384574.2:c.586C>A

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP7

The NM_001384574.2(SAMD4B):​c.586C>A​(p.Arg196Arg) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,459,636 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts 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: 6.9e-7 (0 hom.)
• Consequence: SAMD4B NM_001384574.2 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.625
• Publications: 0 publications found

Genes affected

SAMD4B (HGNC:25492): (sterile alpha motif domain containing 4B) Enables RNA binding activity. Predicted to be involved in nuclear-transcribed mRNA poly(A) tail shortening. Predicted to act upstream of or within cerebellar neuron development. Located in cytosol. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Our verdict: Likely_benign. The variant received -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.23).
• BP7: Synonymous conserved (PhyloP=0.625 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001384574.2. 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
	SAMD4B	NM_001384574.2	MANE Select	c.586C>A	p.Arg196Arg	synonymous	Exon 4 of 14	NP_001371503.1	Q5PRF9
	SAMD4B	NM_001384565.1		c.586C>A	p.Arg196Arg	synonymous	Exon 4 of 14	NP_001371494.1	Q5PRF9
	SAMD4B	NM_001384566.1		c.586C>A	p.Arg196Arg	synonymous	Exon 5 of 15	NP_001371495.1	Q5PRF9

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SAMD4B	ENST00000610417.5	TSL:2 MANE Select	c.586C>A	p.Arg196Arg	synonymous	Exon 4 of 14	ENSP00000484229.1	Q5PRF9
	SAMD4B	ENST00000314471.10	TSL:1	c.586C>A	p.Arg196Arg	synonymous	Exon 6 of 16	ENSP00000317224.5	Q5PRF9
	SAMD4B	ENST00000598913.5	TSL:1	c.586C>A	p.Arg196Arg	synonymous	Exon 3 of 13	ENSP00000470237.1	M0QZ22

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1459636 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 726004

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33390

American (AMR) AF: 0.00 AC: 0 AN: 44456

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26108

East Asian (EAS) AF: 0.00 AC: 0 AN: 39538

South Asian (SAS) AF: 0.00 AC: 0 AN: 85888

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53160

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5762

European-Non Finnish (NFE) AF: 9.00e-7 AC: 1 AN: 1111066

Other (OTH) AF: 0.00 AC: 0 AN: 60268

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.23
CADD	Benign	12
DANN	Benign	0.79
PhyloP100		0.63
PromoterAI		-0.042	Neutral

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: rs763237352; hg19: chr19-39860684;