NM_138927.4:c.6644A>C

Variant names:

• chr21-33559762-A-C
• NM_138927.4:c.6644A>C

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_138927.4(SON):​c.6644A>C​(p.Asn2215Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SON NM_138927.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.00100

Genes affected

SON (HGNC:11183): (SON DNA and RNA binding protein) This gene encodes a protein that contains multiple simple repeats. The encoded protein binds RNA and promotes pre-mRNA splicing, particularly of transcripts with poor splice sites. The protein also recognizes a specific DNA sequence found in the human hepatitis B virus (HBV) and represses HBV core promoter activity. There is a pseudogene for this gene on chromosome 1. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2013]

DONSON (HGNC:2993): (DNA replication fork stabilization factor DONSON) This gene lies downstream of the SON gene and spans 10 kb on chromosome 21. The function of this gene is unknown. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.03585303).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SON	NM_138927.4	c.6644A>C	p.Asn2215Thr	missense_variant	Exon 6 of 12	ENST00000356577.10	NP_620305.3
SON	NM_032195.3	c.6644A>C	p.Asn2215Thr	missense_variant	Exon 6 of 7		NP_115571.3
SON	NM_001291412.3	c.728A>C	p.Asn243Thr	missense_variant	Exon 5 of 11		NP_001278341.1
SON	NR_103797.2	n.6699A>C		non_coding_transcript_exon_variant	Exon 6 of 13

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SON	ENST00000356577.10	c.6644A>C	p.Asn2215Thr	missense_variant	Exon 6 of 12	1	NM_138927.4	ENSP00000348984.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

ZTTK syndrome Uncertain:1

Mar 30, 2023

Revvity Omics, Revvity

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.068
BayesDel_addAF	Benign	-0.31	T
BayesDel_noAF	Benign	-0.68
CADD	Benign	9.3
DANN	Benign	0.70
DEOGEN2	Benign	0.019	T;.;.;.
Eigen	Benign	-1.0
Eigen_PC	Benign	-0.89
FATHMM_MKL	Benign	0.36	N
LIST_S2	Benign	0.70	T;T;T;T
M_CAP	Benign	0.0071	T
MetaRNN	Benign	0.036	T;T;T;T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	1.2	L;.;L;.
PrimateAI	Benign	0.41	T
PROVEAN	Benign	-1.6	N;N;N;N
REVEL	Benign	0.051
Sift	Benign	0.095	T;T;D;T
Sift4G	Benign	0.12	T;T;D;T
Polyphen		0.0030	B;.;B;.
Vest4		0.15
MutPred		0.13		Loss of catalytic residue at N2215 (P = 0.0019);.;Loss of catalytic residue at N2215 (P = 0.0019);.;
MVP		0.39
MPC		1.2
ClinPred		0.16	T
GERP RS		-1.6
RBP_binding_hub_radar		1.0
RBP_regulation_power_radar		2.7
Varity_R		0.080
gMVP		0.36

Splicing

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: chr21-34932068;